You are basically correct. This type of hybrid system takes a little more to set-up, but gives you the best of the HT technology while allowing you to maintain your traditional 2 channel system.
The pre-outs of the HT receiver for the L/R go to the supratek pre-amp, which just passes them through at line level to the Bel Canto amps. You shouldn't have to do anything special in the reciever for this to work.
HT recievers typically allow for a +/- 6db to 10db adjustment for each channel to account for different speakers. Assuming that the speakers are of at least similar efficiency and the amps have similar gain, then the receiver should be able to match the speaker output. The auto room setup feature will set the volumes appropriately.
One thing to check is whether the supratek needs to be on to do the bypass. Most solid states pre-amps just use the normal circuits with the volume set to unity gain. With tube pre's the best way to do the bypass is to route the input signal to the output with the tube circuits not involved. That way you do not to use up your tubes watching movies and TVs. My guess is that the supratek does the lattler. I am sure supratek can tell you if it is not in the manual.
You might also think about getting a separate external amp for the center and surrounds, depending on the quality of the speakers and how much you use the HT. It means you can easily change out the HT pre-pro over time. There are HT pre-pros with the new lossless codecs available now (like Integra or Anthem) or you can continue to use a receiver with pre-outs and just not use the amps, which can be an economical solution.
The pre-outs of the HT receiver for the L/R go to the supratek pre-amp, which just passes them through at line level to the Bel Canto amps. You shouldn't have to do anything special in the reciever for this to work.
HT recievers typically allow for a +/- 6db to 10db adjustment for each channel to account for different speakers. Assuming that the speakers are of at least similar efficiency and the amps have similar gain, then the receiver should be able to match the speaker output. The auto room setup feature will set the volumes appropriately.
One thing to check is whether the supratek needs to be on to do the bypass. Most solid states pre-amps just use the normal circuits with the volume set to unity gain. With tube pre's the best way to do the bypass is to route the input signal to the output with the tube circuits not involved. That way you do not to use up your tubes watching movies and TVs. My guess is that the supratek does the lattler. I am sure supratek can tell you if it is not in the manual.
You might also think about getting a separate external amp for the center and surrounds, depending on the quality of the speakers and how much you use the HT. It means you can easily change out the HT pre-pro over time. There are HT pre-pros with the new lossless codecs available now (like Integra or Anthem) or you can continue to use a receiver with pre-outs and just not use the amps, which can be an economical solution.