Speaker vibrate no signal

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tda 2050 working sound ok


components tightly soldered--dual rail--16.5-0-16.5 v transformer--2200 uf/50 v 2 caps

--but----


signal cable not connected------speaker vibrating little bit

signal cable connected--------speaker vibrating little bit----but when signal cable is adjusted pushing a little bit inside in pc sound out jack---no speaker vibration


---------IS THIS NORMAL THING OR ANY PROBLEM ? ---------
 
am i able to explain now clearly

signal cable not connected, when i touch the speaker it is vibrating little bit

signal cable connected, when i touch the speaker vibrating little bit, but when signal cable is adjusted pushing a little bit inside in pc sound out jack, no speaker vibration

Is this normal or any problem?
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.