Aleph-5 Problem

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I finished my Aleph-5. The sound good even just beginning to burn in. The off-set was -10mv and -27mv (why get negative ?).
But I have a question need help. When turn-off the Aleph-5 AFTER about 2 second I hear a small CCCC..... sound from the speaker. It's continue 1/2 second, at the same time I see the speaker's Mid-Low driver's CONE was move backward then forward then stop.
I have turned the volume to minimum position.
Can tell me why and how to solution. Thank You!
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.