Stereo power amp for $10k

There's just no sense in spending $10K in this set-up. If the Marantz unit MUST stay then why not match it to a Marantz power amp at about the same price point. Use the difference for some of the really sophisticated new tweaks that can radically improve any system. I recently went to the Rocky Mountain Audio Show and was impressed with the improvement that tweaks make even in $100,000+ systems.

I like Melbguy1's idea of a very good integrated, where you can bypass the integrated pre when watching movies, and switch back to the integrated pre for 2 channel. Best of both worlds.

I agree with those who posted that a $10K amp would be wasted in this setup. I would only consider an amp of that level if I had the Marantz AV7702 running through the Cinema or HT bypass of a top quality stereo preamplifier.

At this price range, You may add BAT VK-600SE or Vk-650SE (used one!) to your wish list. You speakers are pretty good. I heard Pass labs X250.5 and Pilinius amps in the shows, they are very good. However I found BAT vk-600se to have a better resolution, dynamic and especially much better Bass with a more defined control of the sound edges. I also tried Krell EVO402e which was very good too but its sound is too analytic and cold, even thought it has an excellent bass.
That's why I ended up with BAT vk-600se which its sound is also more on warm side of neutral. It is obviously based on taste and is all system dependent ...

good luck.

I was trying to be diplomatic, but am glad others are being more direct.

It is an absolute waste of money and stellar equipment to put a near reference level $10k amp and your speakers behind a mass consumer grade AV preamp/processor. None of the subtle nuances, resolution, imaging, etc, etc will make it past the preamp, no matter how good the rest of the system is. Your preamp is an insurmountable bottleneck.

As pointed out above, you would be far better off buying a dedicated $4k 2-channel preamp and a $6k amp. Then, just switching the amp inputs when you want to listen to HiFi. It would only take a few seconds

You seriously have great speakers that deserve far better than a consumer grade AV preamp