Pyle 400W 4-Channel Hydra Marine Micro Amplifier - Waterproof - RCA Input - 3.5mm Jack - MP3 - Soft Turn On/Off - Volume Gain Level Remote Control - Power Protection - PLMRMP3A

Have been using this amp for over a year now, still sounds great,as others have said the gain control is useless except I just set it and use my iPod as the volume.I'm using it in my jeep with 2 6x9's and two tweeters (tweeters run on one channel) so I have an extra channel, am going to buy a Pyle amp next week to complete.Overall I'd say that for the cost $50 at the time. It is great, straight forward and just plain works.

Smooth installation of this little amp. The hardware is all there for remote MP3 plug-in, remote volume, speaker lead ins, was thrilled.But then I went to play music.Maximum volume is so low you can only really hear it when there is no wind, not the case on most boats! The advertised wattage should have been plenty of power, but it wasn't.So excellent inexpensive amp, but not suitable for the environment it is marketed towards.I ended spending twice as much on a JBL Marine amp, and now I can hear the music!!! Only regret is wasting the money on the Pyle unit which I threw the box away for so I can't return it. Serves me right for buying the cheap amp.Read David S. Jannke's excellent review for more details.

Looking to upgrade the sound on my EV/Golf Cart and used to power 2 additional speakers. Easy install for this novice and my speakers sound great!

This amp will do well for most applications, especially the water resistant (NOT fully submersible) ones. Unfortunately like many amp manufacturers Pyle has chosen to exaggerate the amp's wattage rating beyond all reason.This amp (like many other low end auto and motorcycle amps) is built on the Toshiba TA8210AHQ amplifier chip. In this case the amp has two chips with each servicing two channels. According to Toshiba this chip is rated at 22 watts per channel at 18 volts. At your average car voltage levels (12-14 or so) it will deliver less. There is no voltage boosting stage which would be required to anything deliver more than about 40 Watts bridged into 4 ohms and the TA8210 isn't rated for bridging anyway.Note: The technical details posted on this unit as of 7/18/10 are also apparently for some other device. This unit has no AA batteries or USB connection.Some other technical details are inaccurate: The documentation does not mention the unit as bridgable and the chip documentation doesn't either. It IS 2 ohm stable according to the Pyle documentation (a correction). Some elements are barely technically correct: The distortion is only correct at very low power levels and if the unit is providing 22w it is doing it at 10%THD. Frequency response is 20hz - 20k not 10hz - 20kNet recommendation: A good unit for marine, motorcycles and where you don't have space. Not as good as it's specs, but most low end amps are using the exact same chip and circuit design with different housings anyway.

Purchased this amplifier in conjunction with Infinity Marine grade speakers to build an ATV audio tube. Since this is a 4 channel amp and i am running only 2 speakers, I bridged the amp to get more power. What i found was that there was too much power, so i un-bridged it and it still has adequate power. Very clear crisp little amplifier in a compact package. It does get pretty hot, but that's to be expected with anything in a compact package. I suppose the aluminum heat sink enclosure does the trick.

OK, so first impressions:*It's. Tiny.*It's neatly wired.*It has a very solid feel to it.I was looking for a small amp to drive the component speakers, the requirements were that I didn't want to run big gauge cables and deal with a traditional amp in my car.This fit into a space *under* the dash. Close enough to the radio that I didn't need to run more speaker wire to tap into the stock wiring. So it allowed me a neat and clean installation.I have a few complaints, the fuse housing on the power lead. IT'S HUGE. Working in the confined space under the dash was made far more difficult thanks to its placement so close to the amp. The power, antenna, and ground wires are too short. I wanted another 6 inches on them through the entire install. Because they were short it took a lot of work to get the tools into the space after it was mounted to crimp wire butts.Aside from that it sounds good. Not as bassey as one would hope, but that's not what it was for really. I don't think it's actually 100w RMS, if I were guessing I'd say it's closer to 33w or so. Which is fine. The Kenwood media deck I'm using is gutless at the best of times so this gave it the oomph I was looking for.Given that its economic and small I'd recommend this for anyone with an underpowered deck pushing anything beyond stock. Though my mazdas stock 25w speakers sounded fine with it too. YMMV.