subs got quieter

Here's the scoop, I have two 2 ohm type r alpine's wired at 2 ohms to a m1000 alpine amp. The amp get extremely hot and has gone into thermal protection several times. My grounds are good so it's not that. But now, the amp doesn't get hot at all and my subs don't sound like they used to (they're very quiet) Any ideas why it's doing this?yeah........

what is the voltage...seems like a low voltage problem to me. Also seems like the amp may be **edHow do you know your grounds are good??? Have you verified with a DMM??

The voltage is 12.8 I measured all the grounds and they all come up as .1 ohmyeah........

You need to check the voltage with the amp playing as loud as you usually play it. Checking the voltage with the amp at rest will tell you nothing. No current draw = no voltage drop.

I make sure to do that then. What should I look at if there is a voltage drop.yeah........

Alright I metered it, and there is a voltage drop. When it plays around the level I usually have it at (loud) the voltage goes from 12 to 11.8, mostly around the 11.9. The alternator has a 14.4 voltage rating. What could be the reason. BTW- I am replacing the alternator with a better one. Right now it's an ebay 160 amp, so I'm getting an Iraggi 200 amp.yeah........

I'm very sorry to post again but I ran out to check the alternator voltage with the system running and it came up around the mid 12s (12.4, .5, .6 etc) So I would assume it's the alternator being overloaded? I do have one more question- how many amps do my amps draw? MRP-M1000 at 2 ohms 1000 watts 70% efficient Rockford 400-4 4 ohms 400 watts 70% efficient Oh and my battery is new, it's an optima yellow topyeah........

System voltage dropping below 12 indicates the ALT is being overloaded, although 11.8 is not that bad.  Yes, a higher output will help that problem.  You say your system was working fine but the amp was getting hot, then suddenly the SPL level is down?  That doesn't sound like a voltage problem, that sounds to me like your gain was way too high and the amp was clipping and you may have damaged a voice coilSupport the12volt.com

The gain was set on the amp at NOM (it's written on there) and this morning it sounded like it normally does. Yesterday it seemed real quietyeah........

draggin waggin wrote: The gain was set on the amp at NOM (it's written on there) and this morning it sounded like it normally does. Yesterday it seemed real quiet

You need to read and follow the instructions in the "How to set your gains" sticky post.

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