I ended up getting a pair of 8" JL AUDIO 8w1v2-4's for a heck of a good price. Now I need more amp.

This came with the car.
http://www.sonicelectronix.com/item_...yval-V752.html
It was driving a pair of these.
http://www.polkaudio.com/caraudio/specs/db651s/

When I have the radio on at a pretty high volume for an hour or so, the sound cuts off. I'm guessing the amp is overheating as it is very hot to the touch.

The speakers say they are 55 watts and the subs I got are 150 watts. So my math comes up with 410 watts total, and the amp supposedly can go up to 500, but the fact that it's been overheating makes me cautious of it. Does anyone know enough about the subject to lend a hand? The amp has been screwed to the right side of my trunk, could I put it somewhere else that might improve airflow?

The amp is also only 2-channel. Would I want 4 channels to have stereo with all 4 speakers?

Using the stock head unit if that matters.

 

Hi,

So are you currently powering the coaxials off of the head unit?

Your subwoofers are being underpowered. The amplifier you linked to is capable of outputting 75 Watts RMS at 4 Ohms. Listening to the subwoofers at higher volumes requires more current and this increased current is beyond your amplifier's capabilities. Your amplifier is sending a clipped signal (Square wave) to your subwoofers. Over time this will destroy your subwoofers and amplifier. Your amplifier will only handle so many protection cycles before it fails.

My recommendation would be to either purchase a 4 channel amplifier with an RMS rating that meets or exceeds the RMS capabilities of all your speakers. You may also use your current amplifier to power your coaxial speakers and purchase a separate 2 channel amplifier with RMS specifications that meet or exceed those of your subwoofers.

 

I hadn't installed the subs yet. The amp was running the door speakers. A friend let me borrow his amp. It's a 600 Watt RMS 2 channel. I wired the right sub in with the right door speaker and the left sub with the left door speaker. Well, if you didn't see where this was going, I blew my door speakers. I didn't crank it very loud at all, but they were only rated to 55 rms, so I should have stayed under 1/6 max volume, but I guess I exceeded that. I'm now looking at getting a crossover to filter my sound. I don't think I want my subs playing the high notes and the door speakers playing the low notes, do I?

Any recommendations for replacement door speakers?

http://www.sonicelectronix.com/item_2101_Boss-BX35.html That any good?

 

Buy a head unit new door speakers and a better amp.