I’m not sure if this has been mentioned already, but I’ve had this exact experience and my sister pretty much always sounded better after 8 o’clock at night.
I do use conditioner and that helps some. Pretty good success with running my stereo off a large battery. It’s worth experimenting with both of these Options.
I would say the most dramatic results that I’ve heard are with a DC blocker. DC current alter the sound by adding noise and distortion typically caused by HVAC solar panels and so on and I think it’s going to continue to be a bigger problem with being noisy and dirty and electronic devices as those devices proliferate throughout our homes and neighborhoods.
but not all DC blockers are created equal. There’s a synchro Uni that I’ve settled on for a price that I can live with and it works wonders. There are also cheap blockers which claim to do the same thing, but do not.
As always trust your ears.
I may Ido a YouTube video on this. It’s a good topic. It’s worth it.
- American audiophile