Re: [Chevelle-List] Stereo question.

[Herbert Lumpp]

Hey Rodney,   I checked the link but that's not going to help.  My system doesn't thump when I turn it on, it thumps when it's already on and then the electric engine cooling fans kick on.   As for the cap, from what I've read about them, you're right, but my understanding is they also act like a shock absorber of sorts for power spikes such as what I think is happening when my fans kick on and the alternator suddenly increases its output. cYa-   Herb ----- Original Message ----- From: Rodney. To: [EMAIL PROTECTED] Sent: Saturday, October 05, 2002 11:53 PM Subject: Re: [Chevelle-List] Stereo question. Hey Herb,   I don't think a cap will prohibit this "thump" sound from happening.  My understanding of a cap is that it "stores" power so that when you hit a deep bass note, it'll hit with full force or power.  You're obviously getting enough power to make this "thump" sound so you shouldn't need more power from a reserve storage of power.  If anything that'll make the "thump" sound stronger.    The cap is usually for a problem like your when your headlights dim at night when deep bass notes are played.  The normal power from the battery runs the headlights (and everything else) at a consistent power level and then the deep bass note uses the normal power plus whatever reserve power is stored in the cap.   To stop this "thump" you have I think you're looking for something like this  http://www.sounddomain.com/sku/STISPSON     Rodney. 71 Chevelle El Mirage, AZ       ----- Original Message ----- From: Herbert Lumpp To: Chevelle List Sent: Saturday, October 05, 2002 5:09 PM Subject: [Chevelle-List] Stereo question. Ok all you stereo gurus...  Hopefully somebody can help, the guys at the local stereo store are stumped.   If I have my stereo on (not loud but normal listening volume) and the electric fans kick on, I get a huge thump through the woofers.   The alternator is a CS130 putting out 105 amps.  The fans turn on/off with a thermo switch through a pair of relays.  The sub amp is running 6 gauge power wire directly off the battery and the fans' main power feed off the alternator.   It sounds to me like the fans are causing the alternator to suddenly put out some juice and the sudden power output is causing a surge through the system resulting in a huge thump through the woofers.  Am I on the right track or way off base? (no pun intended)  Will one of those big capacitors in the power line to the amp absorb the surge or do I need to try something else?   Thanks. cYa-   Herb Lumpp 1966 El Camino ACES 3509, MCC 528 http://users.adelphia.net/~hlump/