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Help Please Woofer Pumping Is it Amp, CD or ?

Fellow Audiogoners,
I have a pair of Amphion Argon2's whose woofers sometimes pump. I recently blew a voice coil, and I am starting to think the problem is up the chain..ie my amp or Cd player.
I use a Shanling T100 connected directly to a Counterpoint Solid 1 amp. There is a "Thump" with woofer cone outward movement powering up and down amp. Also sometimes I start to lose quality of sound from one side.
Could irratic behavior on either product be causing this pumping? Any ideas? Thank you
krobertschile
gmood1
1,251 posts
 
I could be wrong...It maybe your amplifier passing DC current to the driver. This is bad!!! It will fry your drivers if you continue to use it.
whatjd
1,139 posts
 
Could be some type of problem with your amp...something subsonic oscillating going on...or, more likely, feedback.

Like a mic when you get it close to a speaker and you get high pitched feedback, if your speakers are causing feedback by vibrations getting back to your source cd.

If this happens at low very low levels...it is likely electronic...if it only happens at mid to high volumes..it is more likely feedback.
jeffreybehr's avatar
jeffreybehr
805 posts
 
Turn the woofer amp off and disconnect all IC cable. Turn it back on. If the cones pump, it's the amp causing it.

Turn-on and turn-off thumps aren't necessarily bad but depend on severity IMO. How far do the cones move on turn-on/off?
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