car speakers pop when car turned off (amplified)

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
Phaelium
Posts: 4
Joined: Mon Apr 15, 2002 1:01 am
Contact:

car speakers pop when car turned off (amplified)

Post by Phaelium » Mon Apr 15, 2002 1:23 pm

Hey<p>I have a 4 channel amp in my car running all the speakers, and when I turn the car off it is causing a loud popping noise on all 4 speakers. From what I've been told, its because my amplifier is turning off too late, after the receiver (cd player) has turned off. There is a remote turn on lead coming from the receiver that turns on my amp (and turns it off). What I need to do is find a way to have my amp turn off before the receiver does. I know I can put a capacitor delay in between the receiver and the power to the receiver, but that would delay everything, not just the amp turning off, so I don't think that will work. Any ideas?

User avatar
MicroRem
Posts: 205
Joined: Tue Dec 04, 2001 1:01 am
Location: Vancouver, WA USA
Contact:

Re: car speakers pop when car turned off (amplified)

Post by MicroRem » Mon Apr 15, 2002 4:19 pm

just put a relay in series with the speaker leads that is pulled in by the ignition switch. Shutting off the key will disconnect the speakers before the pop is generated.

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Re: car speakers pop when car turned off (amplified)

Post by Chris Smith » Mon Apr 15, 2002 5:15 pm

That could be a bad Idea, when the amps have no where to discharge their load? [impeedance would be missing] You "Might" blow the amp? <p>Just rig up a large cap on the Stereo positive to keep it running for a few more seconds only, while the Amp shuts off. You might try this with all three items, one at a time until you cure your problem. My guess is the power relays in the amp [or cd, or stereo] clicking off and giving a "bounce" of amperage "induced" back into the circuit?

keymaker
Posts: 214
Joined: Mon Jan 14, 2002 1:01 am
Contact:

Re: car speakers pop when car turned off (amplified)

Post by keymaker » Tue Apr 16, 2002 8:48 am

Wow..
Of all the times I've seen someone use a cap for car audio...<p>This is the FIRST person to come up with a useful purpose for one..<p>Good idea.

User avatar
MicroRem
Posts: 205
Joined: Tue Dec 04, 2001 1:01 am
Location: Vancouver, WA USA
Contact:

Re: car speakers pop when car turned off (amplified)

Post by MicroRem » Tue Apr 16, 2002 9:46 pm

Hmmm.. Could be a bad idea, but if I'm not mistaken, solid state amps can handle a no load situation ok, it's tubes that don't like to be "unloaded". I s'pose if you were concerned about it, u could use the relay to swap to a dummy load, but I'm really not sure it's necessary.

Post Reply

Who is online

Users browsing this forum: No registered users and 46 guests