Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Distorting amp
Distorting amp
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
Reply
 
Thread Tools Search this Thread
Old 4th June 2019, 05:42 AM   #1
goodguys is offline goodguys  United Kingdom
diyAudio Member
 
Join Date: Feb 2011
Default Distorting amp

Hi And thanks for reading.


I have a polk audio RT3000P active sub and there is something wrong with the amp board. When the volume is low the sub works fine, but when i raise the volume to about 30 watts the sound starts distorting. Have checked the drive units and they are fine, also checked mains power supply capacitors and they are good.
I did read somewhere that someone repaired this and blamed it on caps, he did a full board recap though.



What is this distorting problem indicative of.


Thanks.
  Reply With Quote
Old 8th June 2019, 09:15 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
I would first check on a scope you aren't going into clipping.
Maybe the driver impedanc eis too high or low for the amp.
__________________
PCBCAD51 download or CDROM October 2019 version out now ..https://www.murtonpikesystems.co.uk
  Reply With Quote
Old 8th June 2019, 10:29 PM   #3
rayma is offline rayma  United States
diyAudio Member
 
Join Date: Apr 2011
Quote:
Originally Posted by goodguys View Post
When the volume is low the sub works fine, but when i raise the volume
to about 30 watts the sound starts distorting.
Are you certain that the voice coil isn't rubbing?
  Reply With Quote
Old 9th June 2019, 06:02 AM   #4
goodguys is offline goodguys  United Kingdom
diyAudio Member
 
Join Date: Feb 2011
Thanks!


I found the problem, it is a dry joint in the power supply. The problem now is that because of this, the power board has gone all black and burnt, seems to be working though.


The drive units are okay, i hooked them up to an external amp and they sounded fine


After soldering the resistor back down the sub does sound better, just there now problems with the amp board. Looks like one problem after another. Oh well..
  Reply With Quote

Reply


Distorting ampHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Distorting 6L6 amp peterthetrumpeter Tubes / Valves 25 18th December 2018 04:41 PM
Lowther distorting..... help please? jakruby Full Range 12 12th January 2010 04:19 PM
My nad L73 Receiver amp distorting bad! kayjay75 Solid State 1 13th November 2009 09:40 AM
Meridian MCD Distorting doarkface Digital Source 0 10th February 2009 07:47 PM
Sub distorting - help please Simpleton Subwoofers 8 14th August 2005 06:56 AM


New To Site? Need Help?

All times are GMT. The time now is 03:59 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki