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Old 04-11-2014, 12:18 AM
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help choosing amp for low-end insall

Currently have a Sony HU that came with the boat and 4 Polk db651's that I installed last year. Right now it sounds pretty weak so I was planning on adding an amp to the mix. I think I have it narrowed down to two choices. I also plan to add a sub in the near future and would like to run it off the same amp. The amps are:

Soundstream Pn4.520d 4-channel Car Motorcycle Amplifier 520w My concers with this amp are it's not marine rated (does this matter?) and are the specs accurate? If so it seams like a good amp for the price.

JBL MA6004 4-Channel Full-Range Marine Amplifier I was all set to purchase this amp before I found the Soundstream.

Any thoughts on these? Would like to keep it under $150 for the amp. I'm open to any other suggestions. Thanks.
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Old 04-11-2014, 09:07 AM
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It doesn't need to be a marine amp. I would go with a class D amp. You can go with a 4 channel and run the 4 speakers off 2 channels and bridge the other 2 channels for a sub or you could run a 5 channel amp. I would go with something like one of these
http://www.sonicelectronix.com/item_...er-i520.4.html
http://www.sonicelectronix.com/item_...er-i640.5.html
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Old 04-11-2014, 09:55 AM
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I have that soundstream running 4 polk db651 and it pushed them very well. Gain is set fairly low. Everything I read on the amp says it pushed what is stated.

Alot of motorcycle guys use that amp due to the size.
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Old 04-12-2014, 10:05 PM
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Thanks guys for your help. I think I'm going to go with the Soundstream 4-channel and run the four Polks of 2-channels and bridge the other two for a sub. Anyone have any suggestions for a sub and placement in my 96 205? I was leaning toward mounting one in the driver kick-panel if for no other reason than to save space.
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Old 04-14-2014, 03:28 PM
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One thing to consider if you do any slalom, having a 100lb sub/box WILL throw the wake off slightly.
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Old 04-15-2014, 08:57 AM
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I had that exact JBL amp pushing my 4 polk db651s in my prostar and it sounded damn good! I never had an issue with the amp overheating, and we had some pretty hot days during the summer.
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Old 05-16-2014, 10:05 PM
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Question

Alright guys I've got the amp hooked up and added a Polk DB series 10" sub under the drivers console. I have a question about the settings on my HU. It is a Sony CDX-GT33W with two pairs of RCA outputs on the back for front-out and sub/rear-out. In the manual it says to select sub-out if going to a sub and rear-out if going to an amplifier. What should I set it to? I know this may sound like an easy question, but it has me confused when it says "if going to an amplifier"?

Another question is about the low and high pass filters in the amp itself. The only option on the amp is for low pass at 80hz and high pass at 80hz. In this thread David Analog stated that 80hz low pass is too low for a 10 inch sub in a boat. In the settings of the HU there are low and high pass filter options with more choices. Can I set the amp to flat and use the settings in the HU? What would the recommended settings be for low and high?

Thanks for any help as I am a complete stereo illiterate.
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Old 05-16-2014, 10:15 PM
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If the sub is powered by a full-range amp thats in "low-Pass, you leave the "rear" on full-pass and let the amp do the filtering.

What amp did you go with?
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Old 05-16-2014, 10:26 PM
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Quote:
Originally Posted by MLA View Post
If the sub is powered by a full-range amp thats in "low-Pass, you leave the "rear" on full-pass and let the amp do the filtering.

What amp did you go with?
I went with the Soundstream PN4.520D 4-channel amp. Running the 4 Polk db651s off the front two channels and the sub bridged off the rear two. Is it not a good idea to let the HU do the filtering?
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Old 05-21-2014, 08:54 PM
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X2 on a full range class-D amp. Marine grade if it gets wet and non marine grade it it doens't Your battery and alternator will thank you.
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