where to find gain control for rockford fosgate Punch 125.2 - 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 25th September 2007, 01:22 AM   #1
spooney is offline spooney  United States
diyAudio Member
Join Date: Dec 2006
Default where to find gain control for rockford fosgate Punch 125.2

I've got a Punch 125.2 with a gain control that i believe to be out of tolerance. There is about a 1 k ohm difference between the gain controls for each channel when both are turned into their max or minimum positions. Is that difference in ohm load going to cause any huge problems?I can get equal output from either channel, I just have to turn one up a lot higher than the other to acheive the same output. I'll probably just change them both out as they look to have been abused by the previous owner.
  Reply With Quote
Old 25th September 2007, 02:28 AM   #2
diyAudio Member
Join Date: Dec 2005
Location: Northern California
Sounds broke. They should match exactly. I would replace it for general principals that its not right. I have never seen one not matching from one channel to another...
  Reply With Quote
Old 25th September 2007, 03:12 AM   #3
spooney is offline spooney  United States
diyAudio Member
Join Date: Dec 2006
does digikey carry those parts? The part says 5K 751M on the top of it.Is it just a 5 k ohm variable resistor?
  Reply With Quote
Old 25th September 2007, 03:37 AM   #4
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
It probably has a linear resistive element. To make sure, set the pot to the center position and measure the resistance from the wiper to either leg. If they're approximately the same, it's a linear taper pot. This needs to be done with the pots out of the board.

There should be a 909 and a 270 ohm resistor (values used in older amps) for each gain section. Check them to make sure they're in tolerance. If any of the components (including the pot) are out of tolerance, it could account for the difference in the gain at the maximum setting. If the pot is the culprit, I'd expect the gain at the minimum setting to be precisely the same.

I attached a typical Rockford gain control circuit.

Mouser stocks Piher pots and will likely have a suitable replacement.
Attached Images
File Type: jpg rockfordgain01.jpg (31.1 KB, 86 views)
  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
rockford fosgate punch z stevena2006 Car Audio 2 23rd December 2009 04:20 PM
Rockford Fosgate punch 200aIV audiobahnkid592 Car Audio 2 27th October 2009 01:57 AM
Rockford Fosgate punch/power 500.2 Clipped Car Audio 2 11th July 2007 07:08 AM
Rockford Fosgate Punch sub question audiomachines Subwoofers 4 18th August 2006 01:51 AM
Rockford Fosgate Punch 360a2 dawkins Car Audio 1 6th April 2006 05:27 PM

New To Site? Need Help?

All times are GMT. The time now is 11:47 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