How to have great HT and 2-CH Stereo

I have a home theater system using a Rotel A/V RSX-972 receiver. The system works great in home theater but lacking in 2 channel audio CD quality. I'm thinking of introducing a pre/power amps (Plinius CD-LAD and SA-250) for my front L/R speakers. However, I don't know what is the best way to connect this together without having to plug and unplug cable everytime I switch from Home Theatre to audio CD listening. This is because there will be two pre amps (Rotel and plinius) in the system and plinius CD-LAD does not offer by-pass mode.

An alternative will be to upgrade to a high end A/V processor (thinking of proceed) but was told that even the most top-of-the-line 5 channel A/V precessor/preamp cannot match the sonic quality of a good 2 channel stereo preamp in 2 channel CD mode. Do you agree? Is anyone facing the same problem as I am? Please help comment.
Your best bet is to buy the amp-pre-amp. Sell your receiver and use the money to buy an out board processor. You will not find a receiver other than maybe one that will cost you more than the seperates that will sound good on music. Believe me I have tried.
Keep the receiver, buy seperates (or an integrated amp) with HT bypass. Connect your CD player to the new pre/integrated, connect yout HT source to the receiver, power your mains from the new 2-channel rig, and Power your center, surrounds and HT sub. from the receiver.

I use this setup (Arcam Alpha 10 integrated/Denon AVR-3300 receiver) and it works great. You can do this without an HT bypass by just running the L&R-front pre-outs from your receiver into an unused line level input of the new pre-amp. You will have to use a "pre-defined" volume setting on the pre-amp.(maybe Top dead center?). It will work fine that way, but isn't as "elegant" as using an HT bypass.

The Adcom 750 is a low cost preamp $1,400 that has a remote controlled switch for inserting an outboard processor or home theater preamp into the signal chain... so the main speakers run by the Adcom and your main 2 channel amp could be "inserted" into the home theater preamps setup. If the Adcom is switched into the bypass the home theaters volume runs the show., but the connections go from the Adcom to your regular 2 channel amp as before, so if you want 2 channel.. then you got good (decent?) 2 channel.
Other good music preamps may also have this feature??
My solution was to use only 2-channel with the Magnum Dynalab MD-10 Surround Decoder. If you have good 2-channel-why screw it up with home theater? The MD-10 has an RCA out for your sub(s) and decodes 5.1 into two channel. This sounds way better than any midfi or untweaked high-end system. Not quite(obviously) up to high end HT...but almost. And NO WAF problems. Hope this isn't considered heresy.
The Sonic Frontiers and ARC Preamps have a processor loop. I have a Proceed AVP and it sounds decent on 2 channel but my SF is smoother and more neutral overall.
Patrcck, I was struggling with the same thought, too. I have Marantz SR18EX, and Sonus Faber Musica integrated. The easiest solution is;
1. Connect Receiver's "Pre-Out" to your pre amp's available input (Aux or anything)
2. Turn on and set you pre's volume where you can easily remember (i.e. 12 o'clock).
3. Turn on your Receiver and recalibrate the volume balance.
4. Whenever you want to enjoy movies, turn on receiver and pre/power amp, set your pre's input selector to that particular one at 1. above, turn the volume to the designated level (12 o'clock for example), and you can enjoy and control the volume just like you are/were using receiver only.
I hope this helps... BTW, you have a mighty great 2ch system comingle with home theater system!
Oh, needless to say, you can connect the front speakers to your power amp all the time, and you don't have to unplug/plug.
I did the same--essentially built two systems, one on top of the other. For two channel I've got a VTL pre with a processor bypass loop and then a receiver doing the processing and powering the center and rears. It's not nearly as high-end as one might go with seperates for the HT end, but gives you the extra bells and whistles of HT without having to compromise on the two channel (which, as far as I'm concerned, is where it's at). That said, it also allows you to spend as much as you want on the HT without having to consider the equipment's capacity to pull double-duty with the two channel--avoiding that infernal balancing act between HT and stereo that no one seems to have won yet.
I see a lot of good suggestion and thank everyone for the help. I was thinking about the same thing as what Khokugo was thinking by running the receiver in parallel with the pre-amp. When I watch movie, I will set the pre-amp to a pre-determined volume and just adjust the volume on the receiver when watching movie.

However, I'm wondering if this will damage the pre-amp if the receiver's "Pre-out" level that is going into the pre-amp is too high when volume on the receiver is turned up too high. Any comment?
Hi Patrick. I would only try this if I had a pre amp with the HT Loop and here's why. The ease and sense of security when you are changing inputs or in this case, switching to a movie will be lost when having to pre adjust your recievers volume with the 2-channel pre amps volume. I know some people will say "when you adjust it once you should leave it alone" but I say you can forget that as soon as you have to turn it down for whatever reason. Wondering if the levels are right and touching this and measuring that grows old quickly. I used to have a setup like that and it pissed me off. My suggestion to you is to purchase a pre with a HT loop switch. This allows your 2-channel pre amp to get out of the way totally when watching movies and let your receivers volume control all of your 5-6 channels for movies. One volume, one setting! I went with the Anthem 2PL and eventually moved to the Sonic Frontiers Line 1 Pre amp with both being tubed and excellent performers in 2-channel music as well. The Line 1 has the sweetest remote in the business and the overall build is always noted in any review given to this piece. Once again, going through a line level means you have to control 2 volumes as opposed to one and since you are concerend about music quality know one would question your choice of the SOnic Frontiers Line 1.