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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
almarg's avatar
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almarg
9,670 posts
 
The amp doesn't feel hot
Can it still be running hot?
Without being familiar with the specific design, we probably can't rule out the possibility that some particular point or points within the unit are getting too hot, even though it seems cool on the outside.

The most meaningful places to touch on the outside are probably the heat sink fins that are at the sides of the amp.

Looking at some photos, it appears that the top cover is held on by 14 screws. If those are removed it will probably come right off.

Regards,
-- Al
fishing716 OP
316 posts
 
I attempted to remove the 14 top screws but don't have the right tool..
Would you know what size allenwench to use or what size/type screws they are.
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almarg
9,670 posts
 
Don't know. Since it is a British manufacturer, they might be metric. If they require an Allen wrench, this writeup might be helpful, as it indicates which sizes are and are not interchangeable between millimeter and inch-based sizes.

Regards,
-- Al
audioconnection
1,271 posts
 
Ant
Please don't listen to these guys and remove the top
cover to the amp you could get shocked.
wait for the electrician to show up
Best JohnnyR
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almarg
9,670 posts
 
Yes, I should have stated the cautions that the amplifier should be unplugged from the AC when the cover is being removed, and nothing internal to it should be touched whether it is plugged in or not.

Regards,
-- Al
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