speaker volume cuts way down when i touch amp - diyAudio
Go Back   Home > Forums > General Interest > Car Audio
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 16th August 2006, 03:31 AM   #1
TuroK27 is offline TuroK27  United States
diyAudio Member
Join Date: May 2005
Location: Indiana
Default speaker volume cuts way down when i touch amp

ok so i hooked it up earlier todayago & all 4 channels apparently work, buuuuttt...for some reason when i put my hand on the amp heatsink the sound cut out(like it muted)& suddenly some smoke was coming from my headunit & rca wires had gotten very warm all the way from the amp to the head unit. the head unit is ok after all that & i hooked up a speaker to all 4 channels of the car amp one at a time & for some reason the sound cut out every time i touched the heatsink. of course i would cut power to the stereo after every time the sound muted on me as i didnt want to burn something up permanently. i just hope my headunit wont malfunction on me now.dont know if i trust it now that i saw & smelled smoke coming from it.
  Reply With Quote
Old 16th August 2006, 06:14 AM   #2
diyAudio Member
ifrythings's Avatar
Join Date: Oct 2005
Sounds like you have a grounding issuse with your amplifier?

Check all your power connections and if none are wong you may have a bad ground connection in your amp.

If you have a bad ground connection in your amp, the amp will use the rca wire grounds as a return point for the heavy current.(heavy current through rca cable = )

If I were you, I'd pull your deck out and take a look at the bottom of the circuit board for a burn't trace

BTW when you put your hand on the amp, thats probly when the bad connection appears.
  Reply With Quote
Old 16th August 2006, 06:28 AM   #3
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
There's too much current flowing through the RCA cables (as was mentioned in a previous post). It's normal for some amps to pass a small current (a few milliamps) through the RCA shields but it should NEVER heat the RCA cables.

Do not connect the amp to the head unit again until it's been check by a repair tech.

There are at least two possible reasons for this to happen.

If the amp was not properly grounded, there are a few amps that can try to ground through the RCA shields. Some amplifier must have previous damage to do this. Others will do it if they're in proper working order (something the manufacturer changed).

If the transformer shorted (primary windings shorted to secondary windings), the B+ supply can pass to the RCAs on some amps.

Either will damage a head unit.

You can check the shield ground of the head unit with an ohm meter. Unplug the RCA cables from the head unit. Set your meter to ohms. Touch the black lead to the case of the head unit. Touch the red lead to the outer shield ground connection of the head unit's RCA jacks. You should read no more than 2 or 3 ohms. Ideally, you'll read 0 ohms. If you have an open connection, the head unit is damaged.
  Reply With Quote
Old 17th August 2006, 06:25 AM   #4
TuroK27 is offline TuroK27  United States
diyAudio Member
Join Date: May 2005
Location: Indiana
thanks everyone,
ill have to do some troubleshooting now that i have some sense of direction. the head unit seems fine so far. i hooked it up to another amp(one that works) & it still works....for how long who knows but i have no confidence in it. twice ive had smoke come out of that headunit, figured something would be bad by now or bout ready to be.
thanks again guys
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
amp cuts out certain frequencies mulletdude Everything Else 9 8th May 2009 01:55 PM
Finish of the speaker, the final touch.. thanx Multi-Way 3 20th November 2007 03:12 AM
inner cuts of pcbs bigpanda Parts 2 8th July 2006 12:53 AM
The finishing touch: Speaker grills Emprov Multi-Way 13 1st July 2005 06:45 PM
Bass Amp cuts out, please help achtung jackass Solid State 6 23rd March 2005 03:52 AM

New To Site? Need Help?

All times are GMT. The time now is 11:09 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2