Integrating HT and 2-channel systems

Can the ML 332 live with both inputs connected at once? 

This is unnecessary and there’s a much better and more elegant way to do this where the Denon is completely out of the signal path for 2-channel, which is what you want, and you switch between HT and stereo with the push of a button.  You simply run the front L/R preouts from the Denon to an unused RCA input on the Freya and the rest of your HT and stereo connections remain as normal (don’t bother converting the Denon’s RCA to XLR because you’ll still lose the balanced signal so there’s no point).  When you want stereo choose the appropriate balanced input on the Freya and when you want HT choose the input on the Freya the Denon is plugged into.  If the Freya has an HT bypass you’re done, but if not set the Freya’s volume control to 12:00 and set your HT individual volume settings as usual, and when you switch to HT turn the Freya’s volume to 12:00 and you’re good to go (just remember to turn the Freya’s volume down when switching back to stereo).  It’s simpler than it sounds, but many of us here have used this connection method with great success — best of both worlds really.  Hope this helps. 

@kletter1mann 

I had the same problem and there is only one proper solution, but like me it may require you to purchase new equipment (AVR and integrated amp) that have the required inputs.

The AVR will need to be able to "pre-out" the front channels separately and the integrated (or preamp) must have a "home theatre bypass".

Once setup this will allow the AVR to use the integrated to power the front channels, while still allowing you to use the speakers in a two channel setup.

In my setup the  only connection between the "home theatre" and my two channel setup is one interconnect cable. 

If you need to find an amp with HT bypass, this site will help.

The AVR will need to be able to "pre-out" the front channels separately and the integrated (or preamp) must have a "home theatre bypass".  Once setup this will allow the AVR to use the integrated to power the front channels, while still allowing you to use the speakers in a two channel setup.

@tony1954 This is not totally true.  While you do need front L/R preouts on the AVR, which the OP has, you do not “need” an HT bypass (I didn’t have it) to make this work — see my prior post.  Also, the OP has a stereo pre and amp so no integrated needed, but you are correct that all you need to make all this awesomeness work is one extra set of interconnects.  It’s pretty amazing really. 

Man I love the Maggie IIIa's.  I helped my bother set up a huge home theater with them, what a bargain.

With that said, I'm not sure they can breathe in that size room?  You might be better off using the MMG's as the fronts, selling the big Maggies (or storing until you have a bigger room), and getting a preamp with HT bypass, simpler solution.  Doesn't Schidt make one with HT bypass?

@soix 

"and when you switch to HT turn the Freya’s volume to 12:00 and you’re good to go (just remember to turn the Freya’s volume down when switching back to stereo)."

Hence my comment about the HT bypass being the proper solution. I would never trust myself to not forget. Maybe 30 years ago, but unlike wine, we don't improve with age.