[tech] Radio/ Amp

["Chris Chemidlin" <spredhaus@hotmail.com>]

Hey kids...

After doing some motor work to my car, I thought Id treat myself and 
install a radio. Ive run into a big noise.  Here's the setup.

1)Sony 'knob style' radio /cassette------(+ & - are factory hookups, I 
have the switched and constant power leads hooked together.)

2)4x6 'chrystal' speakers (Mark mages  hand-me-downs...Thanks!)  that 
don't make any useful sounds....(powered by radio power)

3)small power amp (20x2) with RCA's and remote switch running on pass 
side of car, and the power running on drivers side to fusebox constant 
power.

4)5.25 Phase-Linear speakers powered by amp.

OK, here's the bad symptoms.

when I turn the radio on (car off), the amp switches on and sounds fine.
When I turn the radio on (car on), the amp has car noise (alt, brake 
lights, horn) at one particular volume- it doesn't change when I turn it 
up.  the radio still works fine, but big noise sucks...
If I unplug the RCAs at the amp and plug in a portable CD player it 
sounds fine---car on or off.

Now the amp seems to be grounded by the mounting screws--when I hook a  
ground to the chassis or to the battery, the noise is still there.

Im no stereo guru, but I like to pretend that I can complete a simple 
circut! Should I try to run the power and ground to the ones the radio 
is hooked to?  question#2)  can I run the 'switch' wire from the amp to 
the FUBA to power it? Right now the 'pwr ant' lead off the radio 
switches the amp.


thanks for any insight!



CHRIS CHEMIDLIN
http://www.spredhaus.com
http://www.angelfire.com/nj/spredhaus
58 Type1 Ragtop
84 Jetta uGLi





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