Loss of bass & full spectrum sound


Can anyone shed light on my audio system problem?
I have PSB Synchrony one,Musical Fidelity M6i + cd player & turntable along w/video
The sound is Full with deep bass then after an hour it reverts to a different unenjoyable presentation with no life..
This has been going on in my NYC apt for about a year
I have a great sound then it changes (white-washed).
I adjust speaker cables(AQ biwire comet)& occasionally it regains a full body sound however after about one hour it's gone.
All my components have been checked to function properly.
I suspect an electrical problem but voltage is steady 120
Any similar experiences?
fishing716
@ fishing716,I believe I would start with your power at hand!,high -end recepticals for each componet,a dedicated 10 gauge electrical line for each componet,with a dedicated ground for each componet with a 20 amp breaker for each componet, this is what I use,problems?,I have none!,the sound will improve dramatically as well!,this will take a few hundred dollars to do,the pay-off sounds in the thousands!Happy listening!
I adjust speaker cables(AQ biwire comet)& occasionally it regains a full body sound however after about one hour it's gone.
If you have an electrical problem at the AC outlet, adjusting speaker cables will do nothing. Are the bottom connections on the speakers tight?
If your system demonstrates this problem everytime as it warms up it is something in your system, but if there is a pattern which occurs at the same time everyday you may want to try a power conditioner.
It seems like the problem is everytime the system warms up.
Everything was replaced with the same results and was unable to locate any malfunctions

Recent amp,speaker cable & speakers
The connections on the amp are tight
For some reason if I reconnect speaker cables I regain the missing low bass output.
It's quite vexing