Possible blown amp...suggestions needed

chuyler1 said:

****** A...I go through the trouble of writing out this post, click send, then I get an error...when I hit back its all gone. Errrr...well from the begining...abbreviated.

I put a Precision Power PPI 5540 amp in my girlfriend's car. Its all wired up perfectly and has been running for the past year or so. The amp had a problem where it would go into protection at high volumes but it worked fine otherwise.

Here are the symptoms:
* The front and rear channels get power and work fine.
* All fuses are intact.
* The sub channel does not work
* The impedence across the sub output terminals is 2ohms...which is correct
* The voltage across the sub output terminals is 0 while the amp is running
* There are no signs of blown capacitors or burn marks on the circuit board
* I have bypassed all eqs and settings and still get 0 volts across the sub terminals
* Everything was working last week.

I'm pretty sure the amp has a seperate power supply for the sub channel and the other channels so it could be that or the sub amp...but like I said, there is no obvious problem when you look at the circuit board.

Anyone got any ideas?

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chuyler1 said:

Well, the whole amp runs of one pair of RCAs. It has filters that send the full/high/low signal from one layer to the next. I originally thought the cutting out was due to clipping because of the limited signal voltage. Basically the front channels are bridged and getting one left channel RCA; the rear channels are bridged getting one right channel RCA; and the sub channel is getting the sloppy seconds from the right channel.

Don't worry, I tried bypassing all these features and hooking both RCAs up to the sub input...that wasn't the problem...its definately internal.

Perhaps the clipping killed the amp at just moderate levels.

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