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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
mapman's avatar
mapman
22,333 posts
 
Mcintech,

Curious what your assessment of the MF amp into 4 ohms is based on?

I think we have seen where the OPs PSB speakers present a challenging load even lower than 4 ohms at some points but nothing that indicates the MF amp is up to the task of driving them well without running out of gas, which seems to be what is happening for some reason.

Thanks.
fishing716 OP
316 posts
 
Mapman
You're assessment may be the correct one.
As I have tried every variation imagionable.
Two reasons that keep me hopeful:
I am satisfied with PSB Synchrony's overall balance with my system & would like to keep them.
It seems improbable the the manufactur nor any other user of these speakers can identify with this problem.
mapman's avatar
mapman
22,333 posts
 
Fish,

Can't you get your dealer who sold you the amp and/or speakers to help you sort through things?

You have a nice published resource here in this thread for reference, with feedback from various knowledgeable members, to help them help you sort through things and cut to the chase, which in my opinion means as a next step being able to try an amp that is better suited to drive the speakers on paper WITHOUT ANY QUESTION BASED ON KNOWN/PUBLISHED AMP SPECS/MEASUREMENTS.
atmasphere's avatar
atmasphere
11,850 posts
 
Here are the things ruled out:
speakers
amps (3 amps used, from 60 to 200 watts/channel)
hearing
electrical

The only clues are: bass might come back on its own or when messing with speaker cables.

This points to another component. What happens if you listen to an LP, and not only have the digital off but entirely disconnected, even unplugged from the wall. This is sounding more like an RF interference problem, and malfunctioning digital can do that.
mapman's avatar
mapman
22,333 posts
 
Atmas,

WHy rule out the amps when there is nothing indicating any of them are/were up to the task of driving the load of the PSBs without running out of gas.

RF from digital, malfunctioning or otherwise, might have an effect but my experience with that is effects are noticeable from the start and not cumulative over time. Not to say any listener might notice ANY negative effect more so over time in general.

Regardless, testing with a different source to see if same results if possible would be worthwhile.
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