Anyone hear the Von Schweikert DB-99?

I have no hum but... I am having a problem with the built in amp in one of the speakers kicking off and on during complex/heavy bass sections in music. Am changing tubes currently in my mono blocks to see if this helps. Does anyone else have this occur to them?

Tony,I wonder if the amp is clipping....email Kevin at VSA...he's very responsive and helpful....good omen for service with VSA if you need it.
Larry

BTW, actual frequency response of the 99's are 21Hz-25KHz (70kHz w/supertweeter) (-3dB).

Best,

Jack

Kevin said it may be going into protective mode during these times. Where do you keep your bass volume set on the amps. Mine is at about two o'clock.

Larry, I am a newbie to this- Newbie question- what is clipping?

Tony,I keep my bass amp setting at high noon but of course the bass volume setting is room and system dependent...clipping means distorting from overload....if the amp is shutting down during real complex passages and loudly played that sounds like clipping and the protection circuit kicks in to protect the gear.Check out my system photo...speakers 10 feet apart, and 4 feet from front wall (distance to rear of speaker).
Larry