Get "Get Better Sound" by Jim Smith. You may have micro-misalignment you can fix with that book.
Download free RTA application for iPhone, run pink noise from speakers, and see what you get at listening position. Then repeat with each channel individually. This is very crude, but also very helpful. Something in your playback change probably has "balance". You can adjust this if you cannot rearrange your room to be more symmetric in response.
Download free RTA application for iPhone, run pink noise from speakers, and see what you get at listening position. Then repeat with each channel individually. This is very crude, but also very helpful. Something in your playback change probably has "balance". You can adjust this if you cannot rearrange your room to be more symmetric in response.