big bang

[no29db]

i recently hooked up an amp to my speakers and when i start my car there is
big bang or crack from the speakers, only for a second with the key in the
crank position.
any solutions?
also just an fyi, i cant remember if it was doing it before cause i havent
driven the vehicle in over a year

also there is a high pitch whine only while in gear and accelerating. at
first i thought my speker wires were too close too my power cables,but they
arent. and it could be the grounds but i doubt it.
any other suggestions?

[e-nigma]

"no29db" > wrote in message
news:TzkXg.124568$5R2.104589@pd7urf3no...
>i recently hooked up an amp to my speakers and when i start my car there is
>big bang or crack from the speakers, only for a second with the key in the
>crank position.
> any solutions?
> also just an fyi, i cant remember if it was doing it before cause i havent
> driven the vehicle in over a year
>
> also there is a high pitch whine only while in gear and accelerating. at
> first i thought my speker wires were too close too my power cables,but
> they arent. and it could be the grounds but i doubt it.
> any other suggestions?
>

Usually this kind of problem is caused by bad ground from the RCA wires.
Try disconnecting the RCA's from the amp and turn it on again and see if the
problem stops

[The Lull]

I've experienced a "pop" when the system turns on, with an alternater
whine while driving as part of the ground wire being too long in a
couple of my installs. You could be having the same issue. Try
shortening the ground to your amp(s) and/or making sure the the ground
connection is very solid. That has solved the problem for me in the
past.
~The Lull
no29db wrote:
> i recently hooked up an amp to my speakers and when i start my car there is
> big bang or crack from the speakers, only for a second with the key in the
> crank position.
> any solutions?
> also just an fyi, i cant remember if it was doing it before cause i havent
> driven the vehicle in over a year
>
> also there is a high pitch whine only while in gear and accelerating. at
> first i thought my speker wires were too close too my power cables,but they
> arent. and it could be the grounds but i doubt it.
> any other suggestions?

[todd.brust]

sounds like it could be a ground issue, try an have all of your audio
equipment to have a good ground...maybe do the big 3 upgrade to the
same size power wire that you have....it couldn't hurt to try


--
todd.brust

[Kevin McMurtrie]

In article <TzkXg.124568$5R2.104589@pd7urf3no>,
"no29db" > wrote:

> i recently hooked up an amp to my speakers and when i start my car there is
> big bang or crack from the speakers, only for a second with the key in the
> crank position.
> any solutions?
> also just an fyi, i cant remember if it was doing it before cause i havent
> driven the vehicle in over a year
>
> also there is a high pitch whine only while in gear and accelerating. at
> first i thought my speker wires were too close too my power cables,but they
> arent. and it could be the grounds but i doubt it.
> any other suggestions?

Make sure the audio cables aren't shorted to the car's chassis. Their
only electrical contact with the car's chassis must be the analog ground
inside the radio.

It could also be crappy equipment:

Lots of stereos have a dirty virtual ground that's fine for the balanced
speaker output but it makes a mess of the unbalanced RCA output. Try
connecting the stereo's speaker outputs to the high level inputs of the
amp.

Some really crappy amps have grounded inputs so high currents flow
through the RCA cables. Pull all of the wires off the amp and check the
continuity between the RCA jack shields and the negative power terminal.
If there's less than 100 Ohms resistance, put the amp on your sidewalk
with a "Free" sign.