BOSS Audio Systems R1004 Riot Series 4 Channel Amplifier Car Audio - Class A/B, 400 High Output, 2-8 Ohm Stable, High/Low Level Inputs, Full Range

It's a cheap, inefficient, class a/b amp. It's not winning any awards at show, but its driving a 12" and adds a little bass to my meager system in my daily driver. I've had this for 4 years now. It survived a car flipping end over end early in its life while being completely unsecured. A little dented and bruised, it has continued to serve faithfully through the years since. If you need something modest, you don't need to blow the latch off your trunk, and don't want to spend a lot of money, this is a decent amp for the cost.

I'm a professional golf cart technician and I installed this amp on my personal golf cart. My setup consists of a Kenwood car stereo receiver (KMM-BT322) and four Kenwood 6.5" speakers (KFC-1665S). I was going after a budget system and this whole package cost only about $170, and that's including a four channel amp wiring kit that I also bought here on Amazon. I installed the amp and radio directly wired to a 12V auxiliary battery on the golf cart. If you try to run this through a DC/DC drop down converter or to two of the golf cart batteries, you will get lots of interference noise with carts motor, controller, etc. Anyways, this amp ROCKS!!! The sound is excellent, and after tuning the EQ a little bit to take away some of the low frequencies that cause a little distortion, I have the system dialed in to play any genre of music loud and clear. This little amp really puts out noticeable power compared to just using the head units speaker outputs. The unit is also very small and easy to conceal. Overall, very satisfied with the purchase, and for the price you can't beat it. I'll definitely look for this amp again when I do another big custom golf cart build!

Bought this 600w two channel amp to run 2 12" subs that are rated for 300w each. Figured it was a good price for what I was trying to do and it worked great,....for about 4 days. Suddenly stopped working when I was out running errands. Fine when I got to the store, nothing when I got out of the store. Literally nothing. No sound, no indication anything is wrong with it, no warning it was defective. Just stopped powering the subs.Still has the pretty blue lights behind the logo and a green light showing it has turned on from the remote wire signal but nothing going to the speakers. Speakers checked out, LOC checked out, even tried wireing up the high input harness just to be sure it wasn't coming from the signal side.Hard wired subs to the speakers in my soundbar (jeep thing) and they're fine. Checked the ground, remote, and power, all fine.The crazy thing is, it didn't blow the fuse on it or on the power supply.Just spend a few extra dollars on something that isn't hoping you mistakenly buy it thinking it said Bose. It's cheap for a reason.At least Amazon didn't hassle me on the return.

While the amplifier claims to deliver 4x50 watts, in my testing, I found it pushed around 41 watts per channel at 14.8 volts. It’s effective for factory setups, providing clear and punchy sound that makes your music more enjoyable. However, it struggles with non-factory speakers, which limits its versatility.

***UPDATE 8/4/18***I went mudding a week ago and accidentally sank my jeep in a pond 🙃 Completely flooded the floor of my interior and soaked the amp, luckily it was off. A couple days later I ripped the entire interior out and washed it out really good, like literally washed the inside of my jeep with a hose. I figured the amp had already been soaked what more harm could I do. Got everything back together after drying out, fired up the jeep, turned the stereo on and BAM! Perfect sound quality. If it can get soaked twice and still work I think that says something.*end of update*Did you know, that running your power lead in close proximity to your audio cables can cause loss of sound clarity, distortion, and you guessed it, alternator whine?! I’ve had to fix plenty of botched installs due to this. I did a little test and ran my audio cables directly next to my 4g power lead going to both my amps. Heavy whine and almost no signal clarity. Re routed my cables to run on the opposite side of my power lead and wow! Signal was clear, bassy, and no alternator whine.This amp is phenomenal and woke up the old Bose speakers I pulled out of a 2001 Pontiac GTP (2ohms at 50 watts RMS, give or take). I drive a Jeep Wrangler TJ and space is precious, so I can’t have big amps and fancy subs. This fit under my driver seat perfectly and cranks some serious audio to my speakers, even with the top down. Great price for a quality low budget system and I get lots of compliments from friends. GREAT AMP!!!

It was indicated that amp produced 400W but it pushes nowhere near that. Not even 150W was produced.

Obviously there are hundreds to thousands of reviews on this "400" watt 4 channel amp, but with all that in mind, I decided to purchase this for a Lincoln SUV to give the factory speakers an extra boost. Arrived within 2 days, took me about 30-45 minutes to install (wiring was already in place from a previous project) and I have to say I'm honestly impressed. Now it's definitely not 400 watts or anything close to that as far as power output goes, but it definitely pumps the speakers up so they sound nice and clean. At first I had this amp powering up 4 Boss 5x7" 3-way speakers, and those sounded terrible but that was the speakers, not the amp. Put the factory 6x8s back in and WOW it sounds good. I didn't notice ANY alternator whine, feedback, buzzing, or any other noises that other reviewers had pointed out. This amp has been installed for about a month now, I waited to leave a review so I could see how it held up over the last month. So far, so good. Especially at this price? Definitely recommend!