speaker cone expand and contract when power on SA-3 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

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 14th September 2010, 03:23 PM   #1
diyAudio Member
Join Date: Sep 2010
Default speaker cone expand and contract when power on SA-3

dear all,

Recently found out that when i turn out my threshold SA3 power amp, the speaker cone will start to poping out and contracting for 3 to 4 times. Its pretty scarely seeing both my left and right speaker are expanding and contracting in different phase, the speaker cone is being pushed to the extreme as if the rubber seal as it is going to burst.

Would like to seek the advice/ explain what is the cause of this problem?

thanks in advance
  Reply With Quote
Old 14th September 2010, 06:41 PM   #2
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
That's a pretty serious turn-on thump. They shouldn't do
that, and the fact that both channels do it leads to the
possibility that your source is involved.

I would check to see that it does it with shorted inputs.

  Reply With Quote
Old 14th September 2010, 06:56 PM   #3
diyAudio Member
Join Date: Nov 2005
That left/right opposite phase thing is really werid. What Are you using for a signal source?
  Reply With Quote
Old 15th September 2010, 12:40 AM   #4
diyAudio Member
Join Date: Sep 2010
My heart sink when seeing my beloved speaker being torture like that.
BTW, the SA3 is pair with audio research SP9 preamp (still hunting for FET 10) and denon player.Nvr strike my mind that this involve the preamp.

will replace with other preamp and CD player this evening and update you guys

  Reply With Quote
Old 15th September 2010, 03:00 AM   #5
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
Zen Mod's Avatar
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
as Papa sez :

disconnect input cables from power amp ( while shut of)

short inputs on power amp , then power it up ;

do you still have thump in speakers ?
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  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
Speaker Cone Dye FrankRoss Multi-Way 18 8th February 2015 12:46 AM
For Sale: Stage Accompany diaphragms for the SA 8520, SA 8525 and SA 8526. Webbie Swap Meet 6 7th March 2010 06:46 AM
Expand capacity of Apple TV commit832 Everything Else 0 27th January 2010 07:01 AM
Repair Vifa D6.8 Plastic Speaker Cone with hole in cone excetara2 Multi-Way 0 30th August 2009 02:32 AM
Please help me expand my little list of subwoofer driver manufacturers buggsson Subwoofers 7 11th July 2007 02:54 PM

New To Site? Need Help?

All times are GMT. The time now is 06:53 PM.

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