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Can hardware change speaker phasing over time??

After years of great listening, I suddenly noticed I wasn't getting the sharp center image with vocals.  I spent hours moving the speakers and even did Room EQ on my Denon receiver (which normally would tell me if speakers are out of phase). The vocals sounded diffuse.  Finally, I switched the wires on one speaker.  BOOM!  Right back to crystal clear center imaging on vocals, on all of my favorite tracks.  I've checked all the wires.  Everything is hooked up right, though now red is hooked to black on one speaker.

Could something have changed the phasing in the hardware?  There is no other place in the set up the wires could have been reversed.  I have triple-checked that the ++++ cable is connected to the red output on the amp.  

Signal goes from Mac Mini by USB to Bryston DAC, by two single channel cables to Denon receiver, by two single channel cables to Parasound A21 Halo amp, by speaker wires (one wire marked ++++) to B&W CM10s.
stroud27612

Showing 1 response by mozartfan

mozartfan
2,143 posts
 
I am in the process of figuring out what s up with my 20 yr old Thors,, I just bought new Millennials tweeters, will arrive next week from Madisound,, Madisound just built new xovers with high quality parts,, but not sure if
A) recent mods bya  local tech on the Jadis DPL Linestage is the issue
B) the Millennials are going bad(just spend $100 for new voice  coils
C) the new xovers just are not as good as the old Hovalnd xovers.
So had all hooked up, and turned it on,, 
Disaster, Completely gone that gorgous Jadis sound, sounds like sh*t.   
Have 2 new Millennials on the way,, Tech guy wants me to swap out tweets BEFORE he chnages his mod back in the Jadis DPL to original design.. 
costing me $$$$$$$
I suggest you try new voice coils in the tweets.  They are  like $50 each. 

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