Question Tannoy SFX5.1 Subwoofer making random thumps

oakwood49

Well-known Member
hi,

Tannoy SFX5.1 Subwoofer

Whilst we are watching anything the subwoofer will make a random loud thump, happens say once an hour or less, but really loud
not had any new AV equipment or moved the sub from its previous position, nothing is different
connected to a sony av receiver
started a few days ago, very strange and very annoying, sub switched to AUTO, tried ON, still happens so not a waking issue
anyone any experience of something similar or is the sub on its way out ? has a 6 year richer sounds guarantee

any help appreciated

cheers
 

asw

Novice Member
Did you ever find a solution? I've recently started to experience exactly the same problem.

Alan
 

oakwood49

Well-known Member
Did you ever find a solution? I've recently started to experience exactly the same problem.

Alan
Sorry only just spotted this
Had to go back to richers who sent it off to manufacturers to get it repaired. All good since
 

asw

Novice Member
Thanks for replying. Since I posted my message about three weeks ago I managed to find out what causes this problem. There are two transistors in the power supply circuitry that appear to be under-rated and overheat. Since replacing them with more robust alternatives it's all been working OK.
 

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