Loud Siren Sound From Speakers

[sydking]

Car was left outside today and i have just had an amp and new speakers and head unit installed. jumped in the car now and the speakers were making very loud siren sounds like a warning siren. The car was very hot.

The car Audio has been fine apart from this time, the only time the car was stinking hot. my fault.

Edited December 11, 2010 by sydking

[BundyBear]

Sydking

couple of Q's to clear thing up

What Brand/Model deck and amp have you got?

are all the speakers running off the amp. Or some on the amp, some on the deck (which ones scream)

Was the sound 'Like' a siren or an actual siren (some Decks have alarms in them)

Does it scream with the key on and the deck off?

does changing Volume or changing source(CD, Radio) have any effect

and did it come good/change after it cooled down?

If your confident get a multimeter and check the voltage on the amp (Batt and Remote)

I know its a bit of a list, but the more info the better.

So far I'd say given the heat, youve got a dried out Cap in the deck or amp but need more info B4 I send you back to the shop

cheers

Bundy

Edited December 11, 2010 by BundyBear

[sydking]

Cheers for the reply mate.

Deck is a Clarion CZ100a and the Amp is a Clarion APX 4241

Only running front splits, and yes they are running of the Amp

Turning the volume up and down does nothing to the siren sound,

The sound will stay on with the unit off, and for a second or two after i take the face off. (which is the only way ive been able to stop it)

Jump back in the car once it cooled down, did the same thing but i took the face off and put it back in. went back to normal.

Since the install after having to return a faulty head unit i added a Antenna cord to the back on the unit and got the antenna wired back up. ( done by the installer)

Edited December 11, 2010 by sydking

[BundyBear]

yea Sounds like the RCA outputs amp chip got hot and went into thermal runaway (basicly got to hot to work properly), this is NOT a PREMINENT condition, although could be indicative of a poor op-amp design

if its back to normal now, I wouldn't worry bout it, but a windscreen shade is probably a good idea

while car audio gear is made for 'harsh enviroments', it's not always made for an 'Aussie Harsh Enviroment'

Cheers

Bundy