Hydra Marine 400W 4-Channel Amplifier - Waterproof with Dual MOSFET Power Supply - GAIN level Controls - RCA Input - LED Indicator - Compact Design for Boat/Vehicle Audio - PLMRA402

None of the cheap car audio amps were below 70$. Low and behold this little guy just popped out of no where. In the 20$ range... huh? Yea i thought so too. Got it, installed, set crossovers to my speakers ranges. Sounds bichin'. Other reviews say its not 400 watts... maybe? But i couldnt get my stereo to 27 of 65 w/out clipping. Just terrible. With the amps gains set to jist the 1st notch - Im able to get to 57 w/out clipping, and thats way loud. Just need some tweets now. Great product I believe (havent had more than a few days, time will tell) - but great product thus far. Cheap Quality w/ a "marine" stamp on it.. for boats i guess, works great in a car.

Good little amp which fits in the changer bay on my 2004 Honda Goldwing and has good sound at low to mid volumes. With it wired correctly with heavy cables (which must be cut down to fit under the spades), this amp works well at low to mid volumes, but cuts out when turning up the volume, even with input gains set correctly (even all the way down where there is little to no amplification). Immediately reducing the volume will restore the sound.

Hooked this up to replace my 20yr old marine audio 120w 2 channel amp. When I hooked it up worked fine until I started the engines. Loud whine came through the stereo as the suzuki 300 were running. Also whine was heard when using underwater lights. It was so bad could not keep radio on, had to shut it down. Hooked back up old amplifier works perfectly. This amp is a pyle of @#$#. I waited too long to hook it up or I would return it. Guess I'm stuck with it now....

Pretty decent little amp for the money. Only problem I had (maybe my fault for poor ventilation) was the amp would cut out or lower the output volume after use sometimes. I’m assuming it was getting hot in my front deck storage of my boat. If you didn’t need something super loud this would be a pretty good amp and it’s fairly compact.

Added this to my two speaker stereo in our boat. Made an instant difference and was just enough for the boat. I also purchased a sub to install but have not yet. Not sure I will since the amp improves the sound quality more than expected. Super easy to hook up.

This made my sound system much louder. Have had it on for about 2 years using it in saltwater and still going strong. Not bad for the price

After thinking about the low cost that I paid, I bumped it to 3 stars. I’m running 4 JL Audio marine speaker (M3 - 6.5”). It pushes the speakers, but distorts when I’m try to get close to max. Yes; I know how to set an amp, done it many many times. It’s more like 50 watts per speaker, not close to 75 or 100. Regardless, it’s okay for the money.

I have a WM7000 down below driving 2 older Bose speakers in the cabin of my sailboat with two Polk audio waterproof atrium 4 under the dodger on deck. Like most single din marine stereos, The WM7000 does not have the power to adequately drive these speakers. Adding the Pyle AMP produced amazing results. The unit is solid and well made. The terminal strips are top quality. Installation was easy. Integration with the WM7000 sound control features using RCA jacks is excellent. This unit comes with a 20 amp fuse…As a sailor and anchoring overnight without an engine running I was concerned the amp would be a power hog. But with my setup running all 4 speakers fairly loud I am seeing only a 1-2 amp draw which is no problem for my house bank. Much has been made of the unit not truly being waterproof. I agree with this but suggest that mounting an amp, or really any electrical component, in an area exposed to constant wetness is stupid - put it out of the weather.