Two systems in the same room

I have 6 sets of speakers in one large room, 2 separate systems: Analog LP and a home theatre.. I cannot distinguish any downside to the sound of the active playing loudspeakers being interacted upon by the inactive ones sitting there.. What interactions should I be hearing?

Thanks everybody. I currently have an old setup of Krell 400xi integrated SS amp and Sonus Faber Cremona Auditors that don't do it really well for rock. I was thinking of going in to purchase of some stronger speakers and some tube gear (since I never had any, I would like to try) and my budget is around 10000$, and then try to mesh the Cremonas to tubes and Krell to the new speakers. I would by it second hand, since that way I think I can get more for the money. What do you think.

If you're happy with the presentation on jazz with the components you have, I might suggest that you move to a higher end integrated, or a tube preamp/SS (or hybrid) amp, & a pair of speakers that will do rock well: Von Schweikert, Tyler, Silverline, Reimer, etc. If you sold your current amp & speakers, and applied them to your budget, I think you will get more for your money. I don't want to talk you out of two systems, but if you are happy with the Krell on jazz music, a really good tube pre/SS amp set up will cover the full range.

Just my two cents...

Boa2 thanks, I will probably do as you suggested but now I have to check up on dealers in my area.