Need Expert Opinions On An Old System

I would agree with Trelja the difference is probably due to a change in room acoustics. Play around with speaker positioning (if you can) and furniture placement.

IF you are looking to change equipment, I might actually start with the preamp ... when I had older, less expensive gear, changing to a better pre (or linestage in my case) made a much bigger difference than amp or source. First high-end linestage I used was a Reference Line Preeminence 1 passive - FANTASTIC ... best part is a good passive is NOT all that expensive. I think Muse amps are well suited to passive linestages if I remember correctly.

Well, first hook up the stuff that has "never been hooked up yet", try that.

And like Celtic66, I was thinking that the 10 y.o.+ Rotel CDP is probably "the weak link". You could have a $50,000 system & hook up an old $100 CDP & it brings the whole system down.....

And/or you could start upgrading everything, gradually. Buying used, I'm thinking you could upgrade some/all of your components to a "whole better system", w/o going broke. (Just my 2 cents, good luck!).

Good thoughts everyone. I'll go ahead and hook the sub/amp combo up. The Muse driving the NHTs don't seem to have as much punch in my previous (smaller) room so hopefully taking some of the load off with the sub/amp combo will allow it to free up a bit.

Regarding the Oppo, good call. I need to go ahead and get one although I'm unsure between the 83, 83SE, or one with various mods (probably out of my budget).

Will keep everyone posted...

You can change your cables because they are all tone controls to a pure silver which will give you a little brighter sound. If your old room had hard products (wood, concrete, tile or etc.) on the floor, walls or etc. then that will make the music brighter. Just the same softer products (carpet, drop ceilings and etc.) will smooth the music out and also a larger room will do the same thing, because of reflections or lack there of like the smaller room.

Sub/amp combo hooked up following preferred method by NHT where I ran the input into the back of my amplifier, then the cabling from main amp to the NHT amp. From there, the NHT amp splits off into the speakers and sub. Crossover set for lowest setting (35hz). Bypass (whatever that is) is set for ON. Overall sound is better in most regards but I notice a few things:

1. The 8" woofer on my NHT 2.5s don't seem to have a lot energy/sound coming from them. Crossover on NHT amp set for 35hz and specs on NHT 2.5 say 80hz. When I turn the crossover setting higher than 35hz on NHT amp, I get less sound from the NHT 2.5s.

2. Overall sound levels are much lower. I'm having the turn the level on the preamp much higher to get same db levels.

3. When I turn the NHT amp high enough to get the desired bass levels, I notice it picks up a large amount of mids thereby centering the soundstage around the sub (placed between the two speakers). When I dial the NHT amp down to get the right amount of soundstage, the bass seems a bit thin.