GM-DX871 - Powerhouse Amplifier with 1,600 Watts, Class-D Technology, 1-Channel, Variable Low-Pass Filter, Compact Design, and Remote Bass Boost Control

Have this running a set of Audison APK130 component speakers fully active with signal from a Pioneer headunit. Sounds fantastic and plenty of power. Extremely simple to install. Literally plug and play if you're using a headunit with ISO connections. No need to run additional power to the battery if your stereo circuit has enough power. Unit is very small so easy to hide in or behind the dash. Comes with some mounting screws but I just used velcro to stick it to the carpet behind the glovebox. Only minor complaints would be no gain control and fixed wire lengths can limit placement and/or a pain to tuck away.

Installed this plug and play unit in my 2012 honda (you need an ISO t-harness specifically for your car - usually £10-20 if you want a plug and play install). Was a breeze and made a huge difference- 20-30mins. Prior to the installation I upgraded all four 6.5” (17cm) speakers on all four doors. I added JBL stage 2 components in front (45w rms - £60) and Cerving Vega red 2 ways in rear (65w rms - £100) There was no bass and the speakers weren’t loud. Not a surprise as the factory head unit puts out 10w rms per channel tops. So not enough for the speakers that I installed. But after adding this compact amp, which beautifully fit behind the head unit, the audio is so loud that is impossible to listen to it at max volume. I tried it, and there was no distortion. On youtube I’ve see this amp tested. And it truly provides over 45Wx4. The test showed over 50W rms per channel. The amp also doesn’t get warm. And most importantly, nobody would guess that my 2012 car with a factory head unit has an upgraded system until they hear it. I did not have to cut or splice any of the factory wires. There are no crackles, pops or unwanted noise from the amp. It is perfect. I have plenty of mid bass with the speakers I purchased and they will do. But if I wanted to, I could also add a subwoofer. But I am very happy with the outcome and will keep things as is. Hope this review helps.

Been running this amp for a year now and it's been perfect. As to the other review that states there are no instructions on how to bridge this amp. There are instructions in the manual and it tells you which wires to connect, but they're not very clear and obvious. You also have to do this yourself and remove the pins from the connector and reconnect in a different order. This is very easy to do with a pin removal tool (or even a paperclip). I removed the four pins not needed anymore as I have no intention of running rear speakers and heat shrinked them, leaving only four pins connected in bridged mode for two front speakers. The only issue I encountered with install was that the outer casing picks up interference and causes noise through speakers if it touches any chassis part which is earthed. You need to make sure the amp is isolated from the body. A ground loop isolator will remove the noise but also reduces low frequencies. Mine is installed in my glove box. Takes up hardly any space as it's so small. It's isolated, well ventilated and easy to remove if any faults. Sound quality is superb for the price. I did test it with 4x45w to begin with and even 2x45w and the sound is good and a massive improvement over a stock head unit amp. Being able to bridge makes it a really versatile amp and able to drive aftermarket speakers correctly. The instructions should be clearer and a pre made off connector for bridged mode would make it easier for people to utilize this feature. Take your time and install it correctly and it's a really good amp for the price.

Easy to install. Very light and compact. Fits in a mini neatly. Plenty of output.

My current setup is a pair of Focal component speakers with a JVC head unit. I needed an amp that can be hidden so I chose this amp. It fits really easy behind my head unit and my speakers sound perfect now. It’s like they’ve come alive once I installed the amp but there is a catch! I strongly recommend powering the amp directly from the battery instead of using power from the existing harness since my head-unit would sometimes randomly shutdown or glitch while it was playing music and it makes sense since the amp is basically stealing power from the radio if you don’t run a wire to the battery. You need a 12 gauge wire and a fuse holder with a 20amp fuse plus crimping accessories. (I say 20amp fuse since the amp already has a 15amp internal fuse so the power wire fuse should be slightly higher) A lot of people are saying they don’t know how to bridge the amp, it was actually easy. (I will include a picture of the wiring diagram). You have to remove a few pins from the reverse ISO harness (picture included). 1) remove the pin for the white/black wire 2) remove the green/black wire and stick it in the hole where the white/black wire originally was 3) remove pin for the grey wire 4) remove pin for the violet wire and insert it where the grey wire pin originally was. I bridged my amp since I don’t use the rear speakers. (Only a front set of component speakers + sub).

Fulfilled my expectations. Tonally it seems no different than the factory head unit, which just indicates its high level of transparency (a good thing). It's capable of delivering significantly more power than the factory head unit and this has enabled me to fit some better sounding after market speakers that were not quite as efficient as the factory speakers and still turn it up when the mood takes. Its not capable of blasting huge SPL, but I doubt anyone considering this would be expecting that. The compact size meant I managed to find a perfect spot for it behind the glove box. The high pass switches should come in handy when I fit a small subwoofer as it should stop the door speakers having to work so hard hopefully further improving sound quality. The only slight niggle is that my car has stop / start and in traffic there can be a momentary interruption to the sound when the car starts back up, which was not an issue with the factory head unit on its own. Also if the volume is very high when the stop / start activates the sound can cut out entirely as the amplifier senses the voltage drop and puts itself in protection mode. Not a big deal for me as its quite rare for me to listen at very high volume, but something to bear in mind if you do enjoy your music very loud.

First things first, the delivery was very quick - I got it here in Ireland within 2 days of ordering it which was great but that's the only good thing about it. I hooked it all up and it didn't work straight away, it took some faffing about with the iso blocks to get it to power on when it finally did it made a big difference to the Pioneer speakers I have in the car....it was great for all of 5 minutes, after installing it in the car I turned my radio up (also pioneer) it goes to 62 and I got as far as level 40 when the radio switched itself off. I thought I must have blown a fuse so I checked all of them two, three, four times at least.... all perfect. This little amp somehow managed to fry my accessory lead which switches the radio on so now I have to run a whole new accessory wire into the car to get my radio back working! It seems like a great idea but honestly I wouldn't waste my money if I were you! It's just not worth the headache it has now given me, do yourself a favour get a proper amp and wiring kit instead!

Plugs straight into your iso harness and fits in the space below double din in a golf mk5. I’ve connected it to a sony Avx ax5550d which has a small body for cars with little space. The only issue I had was at high volumes some functions on my Sony head unit stopped working or became sluggish. Once volume decreased it was fine. So I ran a separate ignition live to my Sony head unit from the fuse box in the car and now all is fine. The amp is good enough to drive the 3 way set of focals in the front, and the 2 way set in the rear panels on 3 door golf gt, where the Sony struggled even though the Sony has a higher power per channel rating than the pioneer. Now the focals are alive and punchy. Good amp for its size I’m really impressed with my system. Got the alpine sub and pioneer mono amp in the boot too. If anyone needs help just ask.