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Bass leaves after amp warms up?

I don't understand-after my Musical Fidelity M6i amp warms up for about an hour I notice the deep bass & kick drum aren't the same.
They sound less musical with loss of weight/depth.The notes are there but the moving of air have left.Sound is has much less impact and boreing.
I had the same problem with Bryston amp so there is no defect with amps nor with the rest of my equipment/
PSB Synchrony one speakers,AQ cables,Bryston CD Player.
My question has anyone heard similar & is there a plausable reason?
fishing716
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almarg
9,670 posts
 
+1 to Mapman's comment just above (as well as his other comments).

Also, just to be sure, I assume that when you disconnect and reconnect the speaker cables you have the amplifier turned off while doing so.

Regards,
-- Al
fishing716 OP
316 posts
 
Also, just to be sure, I assume that when you disconnect and reconnect the speaker cables you have the amplifier turned off while doing so.

Yes of course Al
fishing716 OP
316 posts
 
I have an ad running on Audiogon but don't see the buy it now or ask questions option on my end.
Is that something new or is there a mistake
Here is my ad under cd players:
Naim Audio CD5 XS
Can someone tell me if the ad is functioning correctly
ddd1
261 posts
 
Short of moving some of your equipment to another location, you might try monitoring the apartment voltage and seeing if there are any dips happening when sound goes bad. A hand held RFI detector is also a good investment.
fishing716 OP
316 posts
 
I did move the equipment to different locations with no positive results.
There is no dips in my votage,confirmed by an electrician
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