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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
fishing716 OP
316 posts
 
My apology
Marantz CD Professional CD Recorder CD300
fishing716 OP
316 posts
 
I absolutely leave the amp powered up much as possible including overnight..
almarg's avatar
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almarg
9,670 posts
 
My comments about the CDR420 also apply to the CD300. Looks like it has a front panel switch that selects between ALC, Manual, and Limiter. It should be set to manual, and the recording level set such that its volume meter never gets near the 0 db full scale reference point during any of the recordings. On the other hand, if you set the recording level too low, then noise levels will increase, relative to signal levels, which is why I suggested allowing a margin of perhaps 6 db or so, relative to the 0 db reference point.

Regards,
-- Al
fishing716 OP
316 posts
 
Yes I see those parameters
I will record them again
jjrenman
279 posts
 
Fishing, when you left the amp on did you stop the music or leave it playing? Some amps do not get warmed up or stay warm unless they are playing music.

Just trying to totally eliminate "warmed up" as the cause.
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