Sub Amp Problems Thanks! - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 10th January 2007, 03:45 PM   #1
diyAudio Member
 
crippledchicken's Avatar
 
Join Date: Dec 2003
Location: south east mo.
Default Sub Amp Problems Thanks!

hello, i have had two Parts Express plate amps the SA 240 WATT modelsthat have both, went out on me. i drive them from the left & right speaker level outputs from my Onkyo M-282 2 channel power amp. my question is, could i maybe have some type of problem with my power amp output signals which caused the left channel input on the plate amp to go out? the first SA 240 watt amp that went out on me had problems with the output section of the plate amp. the measured dc offset levels of the Onkyo power amp are 4mv. on one channel and 7mv. on the other so i wouldn't think that would be a problem as low as they are. i thought maybe, the problem could be oscilation but, the power amp outputs and heat sink just barely get warm to the touch also, i never drive the system hard at all this second amp input went out during low volume watching King Of The Hill on satellite LOL! i could try running the replacement amp when it gets here at line level input from my Adcom GFP-565 Preamp outputs but, every sub amp i have ever driven that way seems to lack the output i get when fed from speaker level input. also, the sub doesn't seem to blend as well with my main speakers. i don't have a scope to test for oscillation. any ideas of what else i could maybe check would be appreaciated. Thank You!
  Reply With Quote
Old 10th January 2007, 05:18 PM   #2
diyAudio Member
 
unclejed613's Avatar
 
Join Date: Dec 2006
if your plate amp inputs are capacitive in any way, it could be the onkyo amp oscillating and frying the input stage of the plate amp...... since 90% of all amps out there have capacitively coupled inputs, this is highly likely. use a resistive voltage divider with an 8 ohm dummy load
Attached Images
File Type: jpg divider.jpg (6.9 KB, 53 views)
__________________
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 10th January 2007, 06:17 PM   #3
diyAudio Member
 
crippledchicken's Avatar
 
Join Date: Dec 2003
Location: south east mo.
hi and thanks for the advice. i may try using the line level inputs feeding from an extra set of jacks on my Adcom preamp first, since i haven't tried this particular amp on this Dayton 15" DVC by line level yet. if it's a much safer method to feed it that way, i might just run the sub with line level input. Thanks again!
  Reply With Quote

Reply


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
GFA-565 problems ben62670 Solid State 5 14th August 2008 06:36 AM
HK AVR 335 Problems utjay2008 Solid State 0 21st October 2007 02:26 AM
Nak dvd-10s problems MadMutt Digital Source 8 26th March 2007 10:06 AM
JLH problems serosmaness Solid State 11 2nd November 2004 06:17 PM
RFI problems laz Solid State 3 21st February 2004 07:06 AM


New To Site? Need Help?

All times are GMT. The time now is 07:15 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2