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

What gauge do I currently have?
My cables are Audioquest Comet biwire
Audioquest does not publish specs regarding their cables gauge or electrical behavior, for some reason. I'm guessing here, but I doubt they offer large gauge speaker cable for their low-end or mid-range lines. Like many cable companies, they save the large gauge wires for the big boy$$$$.

The suggested large gauge cables are an affordable way to bring low resistance signal transfer from your integrated amp to your speakers. Given the same cable design, a larger wire gauge should yield lower resistance values.

Don't waste your money on the Highwire Powerwraps featuring voodoo science.

@ fishing716,Hi, I do not want say this,I told you so!,,I already gave you a complete solution,you would be done!your problems with your system would be all but a distant bad dream!,go back to the information I gave you,, wala! Happy listening!,
@ 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'm sorry but don't understand all these details such as 10 gauge electrical line(what is that?)
Also 20 amp breaker(what is that?)
I apologise if I'm not knowledgable of electrical terms as you assume.
I'm just a music listener
John @ audioconnection
That is a very helpful suggestion
I will contact an Electrican
This is Anthony from Staten Island
I've been in your shop many times and purchased B&W 804n from you 15 years ago.
Say hello to Mary your receptionist

Hi @fishing716 
I'm just wondering if you ever solved this problem. 9 years later I hope so! Anyway, I was searching the internet for any insights on this. I seem to be experiencing exactly the loss of bass that you've described. The Bass sounds hollow and thin. But the first few days of owning the amp, I was blown away by the clarity of sound. Music had amazing bass & clarity even at low volumes. Now I get nothing like it. The amp will still play loud, and I do get bass frequencies, but everything sounds very average now.  Anyway, if you found a solution, I'd love to hear it. I'm going to call my supplier tomorrow and explain the problem. I've never experienced an amp sounding so good one day, then just so so the next.