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Woofer pulsating with no volume , Oscillation issue?

Hello all - I just picked up some new Harbeths and as I was listening I noticed the left woofer moving kind of peculiar....I turned off my source & the woofer was actually pulsating in & out with no source volume. 

I have Manley Snappers . I switched sides (speaker cables) with no input & the problem followed to the other side....must be some kind of amp oscillation issue Im guessing...? Thanks for any troubleshooting help- 

128x128tommypenngotti
tommypenngotti's avatar
tommypenngotti OP
217 posts
 

@atmasphere 

 

problem happens with no input cables ...just amp to speaker , thanks! 

atmasphere's avatar
atmasphere
11,575 posts
 

@tommypenngotti In that case you have the two most likely candidates:

1) a tube that is making mostly low frequency noise, which would result in irregular motion in the woofer

2) a regular motion is most likely a failed filter cap, even one that is only 6 months old (we've certainly seen that enough to know it can easily happen)!

elevick
2,636 posts
 

Have you tried switching speakers?  Could be a bad wire from shipping.

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