The 10 Best Mono Amplifiers

Editor's Notes

November 23, 2020:

This time around we've completely overhauled our list, replacing all of our previous entries with more recently released models. While it's true that many of those aforementioned entries are still viable, most of them have been either discontinued, dethroned by an upgraded version, or were simply getting up in years. Many of our newly-selected amps have similar features given that they are all class-D monoblocks, but picking the best one for your needs is going to depend on the price point you're comfortable with and whether or not there are any specific features you need. Don't worry too much if you find a model on our list that seems great but doesn't have the right wattage for your setup, as pretty much all of them have alternative versions available that are identical except for their power-level.

If cost is no issue and you simply want the highest-quality device you can get, you'll want to take a look at models like the Sundown Audio SAE-3000D and the Rockford Fosgate R2-500X1. These choices both have a relatively high per-watt price, but this is no surprise considering that they are beautifully constructed inside and out. Both feature durable enclosures and reliable electronics that are less sensitive to things like heat or excess wattage, which is important for something you plan on driving to its maximum potential on a daily basis. They've got a wide variety of signal controls, passthrough ports for integration with other amps, and the Sundown Audio SAE-3000D even comes with a dedicated bridging mode. Whereas monoblocks generally can't be bridged, since they only produce a single channel, this feature allows you to hook up two identical Sundown Audio SAE-3000D models in order to drive separate subwoofers with the full power of each amp.

The two Kicker-brand entries on our list, namely the Kicker KEY500.1 and the Kicker KXA800.1, are also quite expensive, however in their case it has more to do with cutting edge features than a super high-quality construction. The value of the Kicker KXA800.1 actually comes from its remote, which differs drastically from the wired gain knob that comes with most other selections. The controller that comes with the Kicker KXA800.1 is not only wireless, but can perform four distinct functions. It can adjust gain and phase settings, set the intensity of the amp's bass-restoration software, and can even be used to monitor output clipping. In addition, a single remote can be used to control multiple amps from this series if so desired. The defining feature of the Kicker KEY500.1 on the other hand is its built-in microphone. This allows the internal DSP to automatically adjust to your cars acoustic environment after listening to a series of test tones through your car's existing speakers.

Of course, not everyone needs or even wants a top-end amp with obscure features. If you just want something that works you might be more interested in midrange choices like the Alpine S-A60M and the Pioneer GM-D9701. These devices generally feature only the essentials, such as gain adjustment, a low-pass filter, and in the Alpine's case, a variable bass boost. However, this is made up for by their build quality, both in terms of their enclosures and their internal circuitry. If longevity and reliability are more important to you than onboard signal controls, and you're looking to save some money, these are probably your best bet.

Those who are primarily concerned with affordability may want a basic option such as the Rockville dB11. Choices in this range usually sacrifice a bit of build quality in order to save costs. For instance, while many high-end amps are known for handling wattages way above their rating with ease, models in this range are often quite sensitive and may just barely hit their rated wattages in the first place. The good news is that this is generally not a problem for casual listeners, and even these amps will far exceed the quality of your factory system in all likelihood. If you specifically want something with a low per-watt price because you desire extreme volumes, you may be even better suited by the Soundstream TXP1.18000D, a device that's explicitly intended to provide booming bass at a very low cost.

Before selecting any mono amp make sure that your subwoofer is compatible, and if you haven't already chosen an amp for the rest of your speakers check out our articles on multichannel amplifiers and car amplifiers with Bluetooth.

July 09, 2019:

Every bit as important as the subwoofer you choose for your car is the amplifier behind it. Class D amplifiers are traditionally used to power 12- and 15-inch cones because they're significantly more energy-efficient than class AB technology, and it takes a lot more power to drive a subwoofer than it does a standard speaker. Using a class D monoblock ensures you won't generate too much heat or overly tax your vehicle's electrical system.

With that said, two of the best choices on the market, made by Precision Power, feature dual high- and low-power inputs and can actually function as a three-way stereo and bridged mono amp using what's called tri-mode. Not coincidentally, these top-of-the-line devices have an especially high power rating that makes them safe to run that way. You don't have to set up tri-mode, however, and they do an incredible job using standard mono output, especially in light of their very reasonable prices. Audiopipe is a similarly high-quality brand, offering plenty of bang for the buck, plus they're constructed a little smaller than much of the competition so they're easier to fit into cramped cabs and trunks.

If you're willing to spend a little more, Sundown and SoundQubed are commonly lauded by dedicated enthusiasts as some of the clearest and most capable. They come with very large capacities and can push just about any pair of 15-inch subs on the market, but you should double-check that your electrical system can handle them. Finally, Kicker and Rockford Fosgate are two very well-known manufacturers whose monoblocks definitely uphold their good reputation. If you're looking for anything with an output of over 2,000 watts, we have an excellent rundown of some powerful competition amps in addition to the ones listed under the Special Honors section.

No matter what size amp you end up with, make absolutely certain to use care when installing it. One wrong connection or just a little bit of poor technique can destroy one of these or the speaker it's connected to, thanks to the high level of power moving through the circuitry. Make sure to do thorough research to match all your devices properly, and if you're ever unsure, don't be afraid to seek help from a professional.