Audio Systems: same problem, dry cell battery, 4 ohms

Question
QUESTION: i Had a question on how my car stero amps would shut off at loud volumes it wasent going into a protection mode i thought, but you said it was, a differnt protecton mode and it could have been a crossed speaker wire...ok so i checked all the wires, everything is ok, but it still happens, i tried a after market radio just to see if it did it, well it did, it is also happening a low volumes, i have to turn off the radio then turn it back on again...could it be my turn on lead? its piggybacked off my ciggarette lighter, or could it be my power wire...could there be too much of an amperge draw please help its a 2007 maxima i going nuts
ANSWER: Here are the possibilities that come to mind:

ONE: As you stated, the wiring from the 12v line has too much resistance and when power goes up the voltage drop is too much and the amp drops out.

TWO: You have speaker impedance too low for the amp.

THREE:  Shorted voice coil in one or more of the speakers.

FOUR:  Speaker wire shorted to ground along the way.

FIVE:  Amp is too small and you are just overdriving it.

Keep trying; there has to be an answer.  Sorry I can't be there to physically examine what is going on.  But, I  sure like the Maxima; one of my favorite cars. I have owned two of them.
C



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QUESTION: ok answer 2,3,4,5 are out i think how do i check for a short with a walmart voltmeter? my speakers are all at 4 ohms, new speakers put in , amps are 500 x1 and 75x4 but the power lead is 1,  4 gauge wire  splitting to each amp , same with the ground
ANSWER: Six:  I left out a short at the wiring or contact point of the speaker.  A wire touching the metal basket or other metal parts can give rise to a short down.

You can check the speakers easiest by hooking a 1.5v or 9v dry cell battery across the speaker terminals.  The application of the battery should produce a pronounced "click" sound and you should see the speaker cone move slightly in or out when the battery is connected (depending on the polarity).

Disconnect all speakers and try just one at a time and see what the results are. Have you done that?  If, for example, only one speaker has a short in it then the others will work properly.

Little experimentation is the key here in tracking it down, maybe........  

Best wishes.
C


---------- FOLLOW-UP ----------

QUESTION: i got that and by the way thankyou for helping me on this, the only question i have left is a) is the power wire ok? and B) why does it do it intermititily and at low volumes , also when it does it and you turn it off then back on it does it right away a few times...

Answer
You must check the power wire. If you have the vom, put it on the 12v line and watch the voltage as audio volume goes up. That may tell you if the voltage is dropping.....  You could have a low battery!

I still think you have a connection problem somewhere.  Either bad splice, bad ground or something like that.

Turning it off resets the internal protection system.  So when it goes off it will be ready to start off immediately.  But while voltage is applied it takes a while for it to reset itself.

Hope we got it this time.
C