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Is it normal for the woofer to move in/out slowly

My only tubed piece is the pre-amp. It is the only piece I turn off when not in use. I noticed that when I turn it off the woofers on my speakers move in and out rather slowly while I hear what I assume are the tubes discharging.

Is that normal and more importantly can it cause damage to the speakers?

Thanks
bokfudo
4est
507 posts
 
IMO it is asking for trouble turning off a pre amp while the amps are on. Why do you turn it off? Maybe I am old school, but I have always left my pre amps on.
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arni
313 posts
 
Well, some Tube preamp manufactures recommend them turned on all the time, I've had mine on for over 2 years with original tubes...
drew_eckhardt
394 posts
 
1. It's not abnormal

2. It's only bad if it drives the woofers to their mechanical limits.

If you really wanted you could hang a scope on your speaker terminals and see what's happening.

1-1.5 volts peak is fine even for tweeters (That's what I get in the power amp connected directly to my main actively tri-amplified system's tweeters and they have over a thousand power cycles on them).
ajackson1
156 posts
 
Bokfudo, My speakers does this. I have a tube pre which I turn off after listening, have done this for years with no issues. Back to your question, yes my speakers does this and I don't see it as a problem hence have not investigated. But I will not worry about it.
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