Sony XM604M Marine 4/3-Channel Amplifier

• Marine amplifier delivers 110 W x 4 (at 4 ohms), 150 W x 2 (at 2 ohms), 300 W x 1 (BTL, at 4 ohms)
• Conformal circuit board coating, UV-resistant and anti-rust paint, gold-plated connections/hardware
• Accepts RCA line inputs and high-level speaker output connections, with adjustable input level
• Low and high-pass filters with 18 dB/octave (low-pass)and 12dB/octave (high-pass) slope at 80Hz
• Built-in protection circuitry for thermal overload, direct current, and short circuiting

We bought this for our boat to go along with a new Sony stereo, 4 speakers, and subwoofer. The sound quality with just the Sony stereo and speakers was not impressive, I was ready to return everything. Lots of noise and any bass sounded awful. We decided to give the stereo and speakers a chance by buying the Sony subwoofer and amp. I am so glad we did. After hooking everything up, which was easy, the sound quality was amazing. Everything from Hip-hop to high-treble 80's music sounds great. I was worried because Sony is not known for sound quality, but I am sold from now on. I hope this review helps. I could not find enough reviews when I was buying this product.

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After getting my boat with the factory head unit and speakers in it, I opted for sony's marine unit to add capability to the boat for using ipods-sirius-mp3 discs etc. That went great, as I could use many new modern devices, but the sound was terrible with my 2 little 25 watt RMS speakers. So then I dropped in some new polk (100 watt RMS) speakers. Much better sound but now the head unit couldn't push enough power to the speakers and the unit would start to clip the sound at higher volumes as it struggled to try and keep up. So to cure this I opted for this amp. Now I have what I consider great, clean, clear, crisp sound at very loud levels without any distortion. Now I am not the biggest audiophile out there and this is my first install of head units, speakers and amps but it is all very clear and easy to understand and do. I guess now my next move will to be to buy a sub woofer to run off the amp and then to buy a wakeboard tower and install some more speakers and then buy another amp to run those and then buy the remote commander for the stern etc...But seriously this amp so improved the overall sound and capabilities of my system that it is now something you want to use and listen to.

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I bought a Ski Centurion Elite V 22' boat and wanted to upgrade the stereo system from the existing Alpine unit (which didn't have an i-pod port) and the older marine speakers. I installed this Sony Amp, along with the Sony CDXM60UI Marine Stereo and 6 Polk DB-651 speakers (4 in the boat & 2 on the tower). This combination has a clean crisp sound, even at a higher volume, with a nice bass. I'm so impressed with this amp. My installer was also impressed with how this system sounded. I would recommend it highly.

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I run 2 of these in my boat....wanted to be able to hear some bass over the sound of the motor while wake boarding....got what I asked for....good speakers for the price.

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I am using this Sony amp with the Kenwood KDC-BT752HD car receiver in a boat. The head unit puts out 2.5volts from the pre-outs going to the amp. I am using 4ohm marine speakers rated at 65watts rms. I installed amp with full 8 guage power and ground wires to the battery that are both 16 feet long and Scosche twisted audio cable from the head unit to the amp. Using Ohm's Law, the voltage output of the amp can be 16.1volts before clipping occurs. Volts=Square Root of (Amplifier's power in watts which is rated at 65rms x Resistance in ohms of your speaker which is 4 ohms). I have the head unit at 3/4 volume with a 1000Hz tone playing on the CD and I can only get a maximum of 14 volts from the front speaker outputs and 13 volts from the rear speaker outputs with the amps gain turned all the way up. The Sony amp is not putting out enough voltage to maximize the speakers output, but at least I will not get any clipping. The sound is loud and clear enough so no complaints yet. I have no prior experience with mobile amps to compare it with and have used it only one hour. The quality in the construction of the amp appears to be good on the outside. So far I would recommend to others.

CONS: The only problem I can see would be that the low pass filter switch is not adjustable and only on the rear speaker outputs and high pass filter switch is also not adjustable and only on the front speaker outputs. There is no bass boost, if that is important to you.