8 Best 4000-Watt Amps

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Looking for something really powerful to match your 2000W/2Ω subwoofer? Our article on 8 best 4000-Watt amps is here to offer you some interesting options but also to give you some important guidelines. In this article, we will talk about the purpose and importance of a car amp in a car stereo system. We will also discuss the most important characteristics of car amps and tell you what to look for. We will also try to give you a few pieces of advice on what to avoid and how to determine the actual power output of a car amp.

Why Do You Need a Car Amp?

Car amp is a crucial part of any car stereo system. In short, the purpose of a car amp is to receive the audio signal from your car radio, amplify it without distorting it, and send it to your speakers. 

Cars usually have some kind of preinstalled amp but, as you probably know, factory amps are never great. They are good enough for your preinstalled speakers but if you want to make any kind of upgrade, buying a new external amp is a necessity. It’s practically impossible to connect an additional subwoofer or stronger stereo speakers to your built-in amp. I mean, you could do it but you would never get the expected results. 

So, to conclude, if you want to achieve the best possible performance, you need an amp that matches your speakers. Every single speaker upgrade (new subwoofer, stronger stereo speakers) calls for a new car amp. In some cases, even your preinstalled speakers will sound better if you connect them to a stronger external amp.

What Kind of Amp to Buy?

The answer to this question is very simple. You should buy an amp that matches your needs and plans. So, the real question is – what do you want to do? Do you want to add a subwoofer, replace front and rear speakers, or all of the above? Depending on your answer, you’ll be looking for a different kind of amp.

So, for example, if you only want to add a subwoofer or two and you are perfectly happy with your car speakers, the most convenient solution is a mono amp. Mono amp (or monoblock) is an amplifier with one speaker output and it’s only used for the subwoofers. 

In case you want to replace only two front speakers or all 4 speakers, you would need a 2-channel or 4-channel amp.

If you want to replace all the speakers and add a sub, you could either buy one powerful 5-channel amp or buy two amps – one mono amp for the subwoofer and the other multi-channel amp for the speakers. You will have to choose the mono amp carefully and look for the amp with RCA preamp outputs. These RCA preamp outputs are important for pairing two amps together.  

When buying a mono amp, you should also consider the type of amplification. Two types are the most common – Class-AB and Class-D. Class-AB mono amps are usually cheaper but they are less efficient and have higher operating temperatures. Class-D amps enable great bass reproduction and they are a better choice when it comes to mono amps.

When it comes to multichannel amps (used for powering full-range speakers and tweeters), Class-AB amplification is a better option. Digital amplification is still more efficient (in terms of power output) and offers cooler performance but it distorts the mids and highs much more than the analog amplification. Class-AB amps offer cleaner, fuller, and less distorted midrange and treble reproduction and that’s what keeps them in the game. 

Now that you know what kind of amp to look for, you can start looking for the matching power ratings.

ProductPriceOverall RatingReview
Ignite AudioUnder $1003.9Read Review
Rockville db14Under $2004.2Read Review
Planet Audio BB4000Under $2003.8Read Review
Hifonics BXX4000.1DOver $2005.0Read Review
Massive Audio E4Over $2004.6Read Review
Lanzar OPTI4000DOver $2005.0Read Review
SoundQubed Q1-4500.14500-Watt amps4.6Read Review
Skar Audio4500-Watt amps4.1Read Review

What About the Power Ratings?

In theory, finding the matching power ratings (outputs) is a simple thing. Unfortunately, there’s one problem that makes it much harder.

Let’s see how this process is supposed to look like. Assuming that you already have the speakers/subwoofer or, at least, that you have a certain speaker/subwoofer in mind, you should go through specs and find the speaker’s impedance and RMS power rating (not peak power ratings). After that, you just have to look for an amp with a matching or preferably higher RMS power output (again, not peak or max power output) for the specific impedance (the one that matches your speaker’s impedance). It all sounds super simple, right? 

Unfortunately, there’s one big problem with this process. In theory, the power ratings published in the user manual are accurate. In practice, that doesn’t have to be true at all. In many cases, especially when it comes to cheap amps and generic brands, the power outputs are extremely overrated and don’t represent the actual capabilities of an amp. 

Amps made by brands like BOSS Audio, Planet Audio, Audiotek, or even Rockville, have bloated power ratings. So, for example, if an amp made by one of these brands is advertised as 4000W (4000W is usually their peak power output), that amp can probably deliver only 25-30% of the advertised output. We are not saying that these amps are completely rubbish. In fact, they usually offer decent performance for the price, but their false advertising is really annoying. We have included a few amps made by these brands (since they are all advertised as 4000W amps) in our list but we have also given you some calculations so you can now what to expect.

You need to know the actual power output so you could find the right match. If you already have some 2000W(RMS)/2Ω subwoofer, it would be a mistake to buy an amp that’s advertised as 4000W amp but can only deliver 1000W RMS (or less).

So, is there something you could do to find out the real power output? Well, there are a few things.

First, if you need your amp to push the advertised power output, avoid cheap generic brands. Their performance is never as good as the manufacturer claims.

You can also try to calculate the actual max power output. If you know the max. allowed voltage (usually 14.4V). fuse rating (you can usually find it in the user manual), and efficiency (in some cases, it’s also given in the user manual but you can use the approximate values – .6 for Class-AB amps and .8 for Class-D amps), you can calculate the approximate value of the max power output. The equation below is just a simplified practical form of the Ohm’s law and can be used for any amp but it’s more appropriate for mono amps.

This equation will give you the max output which doesn’t mean much when you have to compare RMS outputs but it can tell you if an amp is capable of pushing the amount power you need. For example, let’s assume that you need at least 2000W RMS and that you are interested in some amp that’s supposed to deliver 4000W max. If your calculations show that the max output is 1000W, you should avoid that amp.

Another thing you can do is to look for CEA-compliant amps. CEA-2006 is a car amplifier standard that defines the way the RMS outputs are measured. If an amp has CEA-certified RMS power ratings, you can be assured that these ratings are real. 

You could also try to find some amp dyno tests. There’s a bunch of those on YouTube. These tests measure both RMS and Peak outputs. They are the most accurate way of determining the actual RMS outputs but there are no amp dyno tests for every amp on the market. So, in many cases, you will have to calculate the max output on your own and then estimate the RMS output. 

Now that you are familiar with the basics and aware of false advertisement, we can move onto the list. Our list of 8 best 4000-Watt amps is divided into three sections – best 4000-Watt amps under $100, best 4000-Watt amps under $200, and best 4000-Watt amps over $200. We have also made one additional section with 2 best 4500-Watt amps since there’ll be no separate list for 4500-Watt amps. 

Warning: If you need your amp to push 4000W continuously (4000W RMS), you’ll have to pay more than $200 (preferably, more than $300). Most of the amps under $200 can’t even push 4000W in bursts (their max power outputs are lower than 4000W).  


Best 4000-Watt Amps Under $100

1. Ignite Audio R1600/1D 

Ignite Audio R1600/1D

Editor’s Rating: 4 out of 5 stars (4 / 5)

Ignite Audio R1600/1D is a Class D mono amp. The advertised max output is 4000W but this thing could never push that much. It can probably go up to 1200W and that’s all you can expect. Still, Ignite Audio R1600/1D is a pretty good entry-level amp and can be yours for less than 90 bucks. 

Impressions

R1600/1D comes with a wired bass level remote, some mounting screws, user manual, and 1-year warranty.

The amp looks compact and durable. It’s 13.7in long, 8.9in wide, and 2.1in tall. 

It features only RCA inputs (there are no high-level inputs). It also has two RCA bridge-in and bridge-out ports for strapping.

R1600/1D features subsonic and low-level filters. Subsonic crossover range spans from 10Hz-50Hz and the low-pass crossover range spans from 32-300Hz. 

The amp also has the bass boost knob and comes with a bass boost remote. You can increase the bass level by up to 18dB. The phase is also adjustable (0-180°). 

R1600/1D is fused at 90A (it uses three 30A fuses) and it’s digital (80% average efficiency). Based on our calculations, this amp can reach 1036W (that’s the real max output). According to amp dyno test, the amp can push up to 1200W. So, the actual max power output is not even near to 4000W and it cannot be reached under any circumstances. 

On the other hand, RMS power outputs published in the user manual are much more accurate. According to the previously mentioned amp dyno test, this amp can output even more than 750W continuously (at 1Ω load), more than 530W at 2Ω, and more than 300W at 4Ω. So, you could easily power your 500W/2Ω subwoofer with this amp but if you have a demanding subwoofer, you should buy something stronger.

Advantages

  • Low-level inputs
  • Bridge-in and bridge-out RCA ports (strapping capabilities)
  • Variable subsonic (10Hz-50Hz) and low-pass (32Hz-300Hz) filters
  • Variable bass boost (0-12dB)
  • Bass level remote
  • Adjustable phase (0-180°)
  • Stable at 1Ω
  • Decent performance for the price

Disadvantages

  • It doesn’t have high-level inputs 
  • The advertised max power output is highly overrated (the amp can only reach 1200W)

Best 4000-Watt Amps Under $200

The following amps are also made by no-name manufacturers. They offer decent performance for the price but they can’t deliver the advertised 4000W. Their real power outputs are much lower.

2. Rockville db14

Rockville db14

Editor’s Rating: 4.2 out of 5 stars (4.2 / 5)

Rockville is another budget brand and, just like all the other budget brands, it has bloated peak power outputs. Rockville dB14 is a Class-D mono amp and it’s advertised as 4000W amp (4000W is supposed to be the peak power) but, naturally, it can’t push 4000W.  What we like about Rockville is that their amps are CEA-compliant and have CEA-certified RMS outputs. What we don’t like is that Rockville publishes three sets of values – CEA-certified RMS ratings (real power outputs), uncertified RMS ratings (much higher than the CEA-certified ratings), and peak power ratings (some arbitrary numbers). This can be quite misleading if you don’t know what to look for. 

Impressions

Inside the box, you’ll find your dB14 amp, wired bass level remote, user manual, warranty card, and so-called birth certificate (certificate with CEA ratings).

The amp has a brushed aluminum housing with a backlit Rockville logo on the top. It looks quite stylish. The amp is 15.5in long, 9in wide, and 2.4in tall. 

The amp has one set of RCA inputs and one set of RCA preamp outputs. It also features one RCA port for strapping with a slave-in/master-out switch. It doesn’t have high-level inputs so you are going to need an adapter if your car radio doesn’t have RCA outputs. 

dB14 features variable subsonic and low-pass filters. Subsonic crossover range spans from 15Hz-55Hz and low-pass crossover range spans from 50Hz-250Hz. There are also the bass boost knob and bass level remote so you can play with the bass response and boost it by up to 12dB. The amp also has an adjustable phase (0-180°). 

dB14 is fused at 100A (it uses two external 50A fuses) and it has an average efficiency of 80% which, according to our calculations (see the equation below) gives you the max output of 1152W. According to amp dyno test, dB14 can output up to 1200W. So, to conclude, the amp can’t reach 4000W. 4000W is just a marketing gimmick.  

On the other hand, CEA-certified RMS outputs are quite accurate and the amp dyno test shows similar values. So, dB14 can push 1000W continuously (at 2Ω) or 600W at 4Ω. For the price, dB14 offers more than satisfying performance and it can easily power one 1000W/2Ω subwoofer. Still, if you need 4000W max or 4000W RMS, this amp is not for you. 

Advantages

  • Compact and easy to install 
  • RCA inputs
  • RCA preamp outputs
  • Slave-in/master-out RCA port (strapping capabilities)
  • Variable low-pass (50Hz-250Hz) and subsonic (15Hz-55Hz) crossover filters
  • Bass boost (0-12dB)
  • Bass level remote
  • Adjustable phase (0-180°)
  • Stable at 2Ω
  • 1000W continuous output at 2Ω (CEA-certified)

Disadvantages

  • Not stable at 1Ω
  • The advertised max power output is overrated
  • It doesn’t have high-level inputs

3. Planet Audio BB4000

Planet Audio BB4000

Editor’s Rating: 4.3 out of 5 stars (4.3 / 5)

Planet Audio is also a generic brand with overrated outputs. We haven’t been impressed by the Planet Audio amps in the past but this one is a little bit better than others. BB4000 is a Class-D mono amp with an advertised max output of 4000W. Naturally, it can’t really push 4000W but it’s still more capable than any other budget amp under $200. 

Impressions

The package contains your Planet Audio BB4000 amp, bass level remote, mounting screws, user manual, and warranty card.

The amp is not that small – the installation will require some measuring and planning. BB4000 is 16.4in long, 7in wide, and 2.3in tall. 

The amp has RCA (low-level) inputs and RCA preamp outputs. However, it doesn’t have high-level inputs and you’ll need an adapter if your factory radio doesn’t have RCA outputs. 

BB4000 features variable low-pass and subsonic filters. Low-pass crossover range spans from 50Hz-250Hz while the subsonic range spans from 10Hz-50Hz. 

The bass can be boosted by up to 18dB – you can use the bass boost knob or the bass remote that comes with the amp. You can even select the frequency you want to boost (40Hz-100Hz). The phase is also adjustable (0-180°). 

The amp is fused at 250A (it uses an external 250A inline fuse) and it’s digital which means that the average efficiency is 80%. According to our calculations, this amp can push 2880W. We found one dyno test for this amp on YouTube, and the test shows lower values (2160W – dynamic burst).

The advertised RMS ratings are also a bit too optimistic. The amp is stable at 1Ω and it’s supposed to push 3000W RMS at 1Ω, 1500W at 2Ω, and 750W at 4Ω. 

The test shows that you will get 1930W RMS at 1Ω, 1100W at 2Ω, and 620W at 4Ω. So, it’s not bad but it’s still far from the advertised 3000W RMS. This amp could easily power a single 1000W/2Ω subwoofer.

Advantages

  • Compact
  • RCA inputs 
  • RCA preamp outputs
  • Variable subsonic (10Hz-50Hz) and low-pass (50Hz-250Hz) filters 
  • Variable bass boost (0-18dB) and adjustable bass boost frequency (40Hz-100Hz)
  • Bass level remote
  • Adjustable phase (0-180°)
  • Stable at 1Ω
  • 1930W RMS x1 (at 1Ω)

Disadvantages

  • It doesn’t have high-level inputs
  • The advertised peak and RMS values are overrated

Best 4000-Watt Amps Over $200

If you really want an amp that can push 4000W (peak power output), you will have to pay more than $200. In fact, you will probably have to pay more than $300. The following amps are made by much more reputable manufacturers and offer significantly better performance than all the previously mentioned budget amps. 

4. Hifonics BXX4000.1D

Hifonics BXX4000.1D

Editor’s Rating: 4.5 out of 5 stars (4.5 / 5)

Hifonics is the first reputable name on this list. This is a company with more than 35 years of experience in making car audio equipment so you can be assured that they know to make a good amp. Their amp quality has maybe declined slightly over the years but they are still very good. They are definitely much better than the generic brands. Hifonics BXX4000.1D is a Class-D mono amp with an advertised max power output of 4000W. The thing that we don’t like about Hifonics amps is that they don’t publish RMS ratings. You can’t even find them in the user manual which is a bit unprofessional and misleading. 

Impressions

Along with the BXX4000.1D, you will get a wired bass level remote, mounting screws, user manual, and warranty card. You will have to buy the wiring kit separately. 

The amp features a recognizable Hifonics design with a backlit Hifonics logo and speaker outputs, shiny aluminum housing, and large heatsinks. It looks like all the other amps from the Brutus series, it’s just a little bit bigger. The amp is 23.1in long, 9.2in wide, and 2.5in tall. 

BXX4000.1D features low-level RCA inputs. It doesn’t have high-level inputs. It also has RCA input and output ports for strapping (slave-in/master-out). 

The amp has variable low-pass and subsonic filters. Subsonic range spans from 15Hz to 35Hz, while the low-pass crossover range spans from 35Hz to 250Hz. 

You can boost the bass, if you like it that way, by up to 10dB. You can use the bass boost knob on the amp or the included bass remote. The phase is also switchable (0-180°).

BXX4000.1D is fused at 275A (it uses one external 275A fuse) and, based on our calculations, the amp can push up to 3168W. We didn’t find amp dyno test for this amp so there’s no way to confirm whether this amp can push that much or not but we can say with certainty that the max power output is overrated. According to the specs found on the manufacturer’s website, the amp can output up to 4000W at 1Ω, 2000W at 2Ω, and 1000W at 4Ω. These are all peak power outputs. 

Since there’s no dyno test for BXX4000.1D, we can only assume (based on tests done for other amps from the Brutus series), that the amp can push more than a half of the peak values. So, you can expect the amp to push at least 2500W at 1Ω and 2000W at 2Ω. 

BXX4000.1D features 3-way protection (overload, overheat, and short circuit).

Advantages

  • Low-level RCA inputs
  • RCA slave-in and master-out ports (strapping capabilities)
  • Variable subsonic (15Hz-35Hz) and low-pass (35Hz-250Hz) crossover filters
  • Variable bass boost (0-10dB)
  • Bass level remote
  • Stable at 1Ω
  • 2500W+ RMS power output at 1Ω

Disadvantages

  • It doesn’t have high-level inputs
  • The advertised peak power output is still overrated

5. Massive Audio E4

Massive Audio E4

Editor’s Rating: 4.4 out of 5 stars (4.4 / 5)

Massive Audio has been in the business of making car and marine audio equipment (amps and speakers) for twenty years. Their E4 amp is an upgraded version of the previous N4 amp from the Nano Block series. E4 is a Class-D mono amp. E4 is a nice midrange amp. Its advertised power output is 4000W but that seems a bit optimistic. E4 is priced slightly under $350. 

Impressions

The box contains your Massive Audio E4 amp, user manual, some mounting screws, and warranty card. Unlike some other amps, this one doesn’t come with a bass remote and you have to buy it separately if you want to. You will also have to buy the wiring kit. 

The amp looks nice and sleek. It has a brushed aluminum housing with a small Massive Audio logo on the top. Just like the amplifiers from the Nano Block series, E4 is quite small considering the advertised power output. It’s 14.3in long, 5.9in wide, and 2.1in tall. 

E4 features RCA low-level inputs. It doesn’t have high-level inputs but it’s capable of receiving high-level signal. Unlike the majority of amps in this price range, E4 doesn’t have RCA preamp outputs or RCA ports for strapping. 

The amp has variable low-pass and subsonic crossover filters. Low-pass range spans from 60Hz to 220Hz and the subsonic crossover range spans from 0Hz to 60Hz. 

The bass can be boosted by up to 12dB. You can use the bass knob on the amp or you can buy the remote. You can even select the frequency you want to boost (30Hz-120Hz). 

The recommended fuse rating is 200A (inline fuse). According to our calculations (see the equation below), the max power output is 2304W which is not even close to the advertised 4000W. We didn’t find any amp dyno tests for this specific amp on YouTube but there are tests for some other Massive Audio amps so you can get the basic idea about their power ratings and actual capabilities. In our experience, their RMS ratings are more accurate than the advertised peak outputs. 

E4 can output 2000W continuously at 1Ω, 1000W at 2Ω, or 650W at 4Ω.

The amp features next-gen 5-way protection. 

Advantages

  • Small and compact
  • Low-level RCA inputs
  • Variable low-pass (60Hz-220Hz) and subsonic (0-60Hz) filters
  • Adjustable bass boost (0-12dB) and adjustable boost frequency (30Hz-120Hz)
  • Stable at 1Ω
  • 2000W RMS power output at 1Ω (1000W RMS at 2Ω)

Disadvantages

  • No high-level inputs
  • Not strappable 
  • Bass remote is not included in the package (sold separately)

6. Lanzar OPTI4000D

Editor’s Rating: 4.6 out of 5 stars (4.6 / 5)

Lanzar OPTI4000D has been on the market for more than 10 years. The amp is quite hefty and very powerful but it’s not very efficient even though it’s digital (Class D). The amp is priced around $700 and that’s not going to be your only cost. The amp is very demanding and you will need an additional battery (or batteries) and an upgraded high-output alternator. In our opinion, you can probably get a better deal for that kind of money but, if you only care about the power output, you’ll be happy with this amp. Its advertised RMS power output at 1Ω is 4000W. The amp dyno tests show that the amp falls short of the advertised RMS ratings but it’s still very powerful. 

Impressions 

Along with the amp, you will get a wired bass remote, user manual, warranty card, and some mounting screws. You will have to buy the wiring kit (1/0-GAUGE wire for the power and ground terminals). 

The amp is quite chunky – it’s definitely not something you could place under your seat. It’s 24.5in long, 11in wide, 2.5in tall, and it weighs 39 pounds.

OPTI4000D feature RCA (low-level) inputs and RCA line outputs. It doesn’t have high-level inputs.

You have variable low-pass and subsonic crossover filters. The low-pass crossover range spans from 50Hz to 250Hz while the subsonic range spans from 15Hz to 40Hz.

The bass can be boosted by up to 18dB. You can either use the bass knob or the included bass remote. The phase is adjustable (0-180°). 

The recommended fusing is 300A and, based on our calculations, this amp can push up to 3456W. According to the amp dyno test, this amp can really push 4000W max, but it can’t deliver that much power continuously. What we didn’t like about this amp is the efficiency. Even though it’s a class-D, the testing shows that the efficiency is less than 70%. Also, the amplifier is very demanding and it draws a lot of electricity which means that you have to upgrade your alternator and buy an additional battery.

The manufacturer claims that OPTI4000D can deliver 4000W continuously at 1Ω, 3000W at 2Ω, and 2000W at 4Ω.

The amp dyno test shows lower values – 2850W RMS at 1Ω, 2570W RMS at 2Ω, and 1700W RMS at 4Ω. So, it’s very powerful but not as powerful as the manufacturer claims.

Advantages 

  • Low-level RCA inputs
  • RCA line outputs 
  • Strapping capabilities
  • Variable subsonic (15Hz-40Hz) and low-pass (50Hz-250Hz) crossover filters
  • Variable bass-boost (0-18dB)
  • Bass remote
  • Adjustable phase shift (0-180°)
  • Stable at 1Ω
  • 2850W RMS power output at 1Ω (2570W at 2Ω)

Disadvantages 

  • Expensive
  • There are no high-level inputs
  • Low efficiency (for a Class-D amp)
  • The actual RMS ratings are not on par with the advertised RMS power ratings

Honorable Mention – Best 4500-Watt amps

Since we are not going to make a separate list for the best 4500-watt amps, it would be a shame not to mention the following two amps. If you can spend more than $500 and you need a beast that can push 4500W continuously, you’re going to love the next two amps. 

7. SoundQubed Q1-4500.1

SoundQubed Q1-4500.1

Editor’s Rating: 4.9 out of 5 stars (4.9 / 5)

SoundQubed Q1-4500.1 is a very powerful Class-D mono amp. It’s a real beast and it can push more than 4000W continuously at 1Ω. Just be sure to upgrade your car’s electrical system – this amp needs an additional battery (or batteries) and requires an upgraded alternator. The only downside is the price. This amp can be yours for less than $750 and, when you take all the other costs into account (wiring kit, electrical upgrades, installation), it will cost you more than $1000 (probably close to $1,500) to install this amp.

Impressions 

Along with the amp, you’ll get a wired bass remote, mounting screws, user manual, and a warranty card. The wiring kit is sold separately (you can use1/0 Gauge wire for the power and ground terminals)

In terms of design, Q1-4500.1 is similar to Skar Audio amps. The amp is quite large and heavy. It’s 25.9in long, 9.5in wide, 2.6in tall, and weighs 30lb.

Q1-4500.1 has RCA inputs and one RCA port for strapping (paired with a master-out/slave-in switch). 

The amp features variable low-pass and subsonic crossover filters. Low-pass crossover range spans from 20Hz-200Hz while the subsonic range spans from 10Hz to 50Hz.

You can boost the bass by up to 6dB. You can either use the bass knob on the amp or the included bass remote. 

The recommended fusing is 400A (external inline fuse) and, according to our calculations, Q1-4500.1 can output up to 4608W (peak power). In reality, this beast can push even more. 

The RMS power ratings are equally impressive. Q1-4500.1 can push 4560W continuously at 1Ω, 2280W at 2Ω, or 1400W at 4Ω. This is an excellent amp, there’s no question about that. The only problem is the price. 

Q1-4500 features overheat, short circuit, DC offset, and high/low voltage protection. 

Advantages

  • Low-level RCA inputs 
  • Strapping capabilities (master-out/slave-in port)
  • Variable low-pass (20Hz-200Hz) and subsonic (10Hz-50Hz) crossover filters
  • Adjustable bass boost (0-6dB)
  • Bass remote
  • Stable at 1Ω
  • Impressive RMS power output (4560W x1 at 1Ω, 2880W x1 at 2Ω)

Disadvantages

  • Expensive
  • It doesn’t have high-level inputs

8. Skar Audio RP-4500.1D

Skar Audio RP-4500.1D

Editor’s Rating: 4.9 out of 5 stars (4.9 / 5)

Skar Audio RP-4500.1D is our top pick on this list. RP-4500.1D offers similar output as SoundQubed Q1-4500.1D but it’s significantly cheaper (priced under $600). So, if you want to save some money and get an impressive 4500W of pure power, Skar Audio RP-4500.1D is the best choice. This is a Class-D mono amp with an advertised max power output of 7000W. Just like the previous two beasts we’ve talked about, RP-4500.1D will require some serious electrical upgrades (additional batteries, high output alternator). 

Impressions

RP-4500.1D comes with a bass level remote, user manual, and 1-year warranty. Wiring kit is sold separately (power and ground terminals are compatible with 0-Gauge wire). 

The amp is quite large – it’s 22.1in long, 8.3in wide, and 2.4in tall. 

When it comes to connections, there are 2 RCA inputs (no high-level inputs), RCA preamp outputs (for pairing with another multichannel amp), and RCA slave-in/master-out port for strapping.  

RP-4500.1D features variable subsonic (10Hz-50Hz) and low-pass (35Hz-250Hz) crossover filters. 

Bass boost knob and wired bass remote will give you additional control over the bass reproduction. You can boost the bass, if you like it that way, by up to 9dB. You can also adjust the phase (0-180°). 

The amp is fused at 450A (external inline fuse) and, according to our calculations (see the equation below), RP-4500.1D can push 5184W (peak power). The amp dyno tests show even greater values. 

The amp can push 4500W continuously at 1Ω, 2900W at 2Ω, and 1600W at 4Ω. So, if you need an amp to power your two 1500W/2Ω subwoofers, RP-4500.1D is a great choice. 

The amp features 4-way protection circuitry that includes overheat, overload, short-circuit, and low-voltage protection. 

Advantages 

  • RCA (low-level) inputs
  • Strapping capabilities (slave-in/master-out RCA input)
  • RCA preamp outputs
  • Variable subsonic and low-pass filters
  • Variable bass boost
  • Bass level remote
  • 1Ω stable 
  • Impressive RMS power output – 4500W at 1Ω, 2900W at 2Ω

Disadvantages 

  • Expensive
  • It doesn’t have high-level inputs

This is the end of our list of 8 Best 4000-Watt amps. Hopefully, there was something for you on the list. Before you go away, let’s make a short recap. Here’s the list of things to consider when buying a new car amp. 

Channels (mono, stereo, or multichannel amp)

This one is a no-brainer. Based on the number of speakers/subwoofers you want to add or replace, you will choose an amp with a matching number of channels. So, if you only want to add a subwoofer to the existing system, you should choose a mono amp. Replacing two front speakers will require a 2-channel amp. If you want to replace two front speakers and add a subwoofer, 3-channel amp is the most convenient solutions. I think you get the point – buying an amp with a matching number of speaker outputs (channels) is the most convenient solution. 

However, in some cases, buying an amp that has more channels than you have speakers could be a viable (more cost-effective) solution. For example, if you want to replace two front speakers and add a subwoofer, you could buy a 4-channel or 5-channel amp and use it in bridged mode.

Class-AB VS Class-D

Digital amplification (Class-D) is superior to analog (Class-AB) in terms of operating temperature and efficiency. So, why are Class-AB amps still in use? The answer is very simple – because they deliver better mids and highs. Class-D amps distort the midrange and high frequencies way too much and that’s why all the multichannel amps are Class-AB amps. The situation is different when it comes to bass reproduction. Class-D amps offer more than satisfying performance with a controlled and punchy low end. Also, the subwoofers require more power than small speakers and, since Class-D amps are more efficient and have cooler performance, they are more suitable for powering subwoofers. So, that’s why the majority of mono amps are Class-D amps.

Power ratings (Real VS Advertised) and impedances

As you already know, you are supposed to buy an amp with a matching or higher RMS power output (per channel) for the given impedance. In theory, the process of choosing the right amp is simple. In practice, there’s one big problem – power ratings published and advertised by the manufacturers don’t have to be accurate. In some cases, power outputs are extremely overrated. Especially when it comes to generic cheap brands. Luckily, there are a few things you can do to avoid buying something that’s not good enough for your needs.

First, spend more and buy from renowned manufacturers. The thing is – it’s practically impossible to find an amp that can push 4000W max if you don’t pay more than $200. Amps that can push 4000W RMS are even more expensive ($300+).

Second, calculate the max power output on your own. If you know the recommended/max fuse rating and amplification type, you can calculate the approximate peak power rating by using the equation below (like we did in our reviews). 

Third, check if the amp is CEA compliant. CEA-certified RMS power outputs are usually very accurate and you can be assured that these values represent the real capabilities of an amp.

Fourth, search for amp dyno tests. These tests can measure the RMS outputs (certified test) and max power outputs (dynamic power) and they are very accurate. Some of the tests are done by third parties (YouTube reviewers and amp enthusiasts) and some are done by the manufacturers themselves (Skar Audio and Orion are some of the manufacturers that publish their amp dyno tests on YouTube).

Features – inputs (RCA and high-level), preamp outputs, bridging and strapping capabilities, crossover filters, protection 

There are a few things to pay attention to besides the number of channels, power ratings, and impedances. Some amps have only RCA (low-level) inputs while others have high-level (speaker level) inputs, too. If you have a factory radio (they usually have only high-level outputs) and you buy an amp with RCA inputs, you may need an adapter (high-to-low-adapter) with an appropriate number of input/output channels. 

If you want to pair two mono amps or one mono amp and one multichannel amp, you should pay attention to outputs. Some mono amps are strappable which means that you can strap/pair two amps together to get a higher power output. These amps usually have ‘’slave in’’ and ‘’master out’’ ports. 

Amp Size

When it comes to car equipment, size is very important. The space you can use is very limited and it’s only natural to pay attention to dimensions, especially when you know how big car amps can be. The amps that can push 4000W RMS are quite chunky and they could never fit under your seat. Your trunk is probably the only possible placement option for a real 4000W amp. 

Wiring and installation

Unless you know your way around cars and have some advanced knowledge of car stereo systems, you should leave the installation to professionals. If you decide to do the installation on your own, you must not try to save money on wiring. You could buy some cheap CCA amp wiring kit but, if you want your amp to shine, OFC wiring kit is mandatory. OFC wire is a much better conductor than CCA wire and it doesn’t get as hot as CCA wire.  

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