Is it remotely possible that the room acoustics in your old house were different than those in your new one?
Naaahhh. Must be the romex.
Unbelievable.
Clean power and it's affect on sound quality
Been reading quite a bit about how clean power can affect sound quality by segregating the system from the dirty grid with power conditioners, high-end power cables, isolators, and even off-grid battery-powered systems.
I've noticed some changes in sound quality with regards to better power supply, especially with regards to the older house I was in vs. the newly built house I'm in now. The older home had a warmer tone due to 50 years of copper wiring being burned in. My new house is brighter because the copper wiring hasn't been burned in yet.
But one thing I also noticed is that when I recently changed the batteries in my remote controls from your typical Duracell batteries to the solar-rechargeable batteries I use now. The sound quality really improved. Dynamics were improved across the board, tonality was warmer...more golden, like a sunset vs. mid-day bright. The soundstage opened up as well with more airiness and clarity to the instrumentation regardless of my media source. I highly recommend using solar-rechargeable batteries for your remotes vs the standard OEC batteries that came with the remote. I think you'll notice a vast improvement in sound quality - being cleaner and warmer.