2. amps-preamps
  3. 1365648136

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

Showing 12 responses by drubin

drubin
3,277 posts
 
Fishing, where do you live? I'm sure one of the knowledgeable would be eager to help you out.

Mapman, why do you persist in pointing to the amp(s) as suspect when the phenomenon only occurs after a period of time? If they are not up to the task, don't you think that would be evident from the get-go?

Fishing, does your system support headphones? If so, see if you hear a similar phenomenon through phones as you do through the PSBs.
drubin
3,277 posts
 
We need Gregory House on this.
drubin
3,277 posts
 
So you use the learning remote to mute the system, and then what? Does the sound change for the worse when you unmute it?
drubin
3,277 posts
 
I'm betting the SPL test when it happens will be inconclusive.

Fishing, do you have a CD with frequency-specific tones you can use, like one of the old Stereophile Test CDs? One-third octave warble tones would probably be good and you want individually measure enough of them to cover the range from deep bass up through the midrange.
drubin
3,277 posts
 
I did listen to the two files but had trouble identifying the difference (my current system does not go very low in the bass, however). Both sounded extremely bright and spitty. How did you record them?
drubin
3,277 posts
 
Kudos to Al for doing the heavy lifting and writing it up so well.
drubin
3,277 posts
 
Is there any conceivable way that. after some playing time, one speaker's crossover is having a major phase shift in the bass that is creating this problem?
drubin
3,277 posts
 
So did you ever NOT have this result? If so, what was the system/environment then?
drubin
3,277 posts
 
The mis-wiring is certainly a big catch, but I don't think it would have caused the bass-disappears-after-an-hour problem you originally had. Guess we'll find out.
drubin
3,277 posts
 
From the AQ website:
Comet is an exceptional Single-Biwire cable. When the halves are separated at the speaker end, the double quad-helix design turns Comet into a true double-biwire set thanks to the magnetic autonomy of each quad-helix. On its own, one quad would be a little light-weight in performance as it is biased towards treble finesse. The other quad is more forcefully biased toward the bass. Together they form a completely optimized full range design, but when separated the Comet becomes a maximum performance double-biwire in a single cable.
Whatever that means.
drubin
3,277 posts
 
Does Accustic Arts have distribution in the US? I guess it must, but I can't seem to identify it.
drubin
3,277 posts
 
Doesn't seem like he was out of phase, just backwards and upside down, or something like that. Though his explanation continues to be hard to decipher.
More to discover