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Want to use AirPlay to connect your Denon XX11-series a/v receiver to your iTunes library? There's an app for that, and while it's a $49 value, you can get it as a free upgrade for awhile starting in November. Denon also has a separate receiver-control app for iThings.

The McIntosh MX150 pre-pro ($12,000) can reassign its XLR and RCA ins, a boon to those into triamplification. Its Room Perfect room correction uses 121 test tones to massage your room with 112 octaves of wonderfulness. While the USB input cannot accept 122 source components at once, it can recognize that many one by one. Let us gloss over the MVP 881BR, an $8000 Blu-ray player with non-3D-savvy HDMI 1.3. That brings us to the binding posts that made our eyes pop out of their sockets. They were on the back of an MC302 power amp. The top hex piece unscrews as you'd expect, while the bottom round piece floats. Details? You want more details? It uses electricity.

The Rotel RKB-1508 delivers eight channels of 65-watt Class D. That enables it to be small, run cool, and shave your power bill. Just the thing if you need to jam an eight-channel amp into a tight spot. Price $1199.

If you're near New York City and want a taste of 3D home theater technology, head to the Discovery Exhibition on 44th street, at Times Square. It's home to the public exhibit of the 3D Experience, a 3D entertainment and technology event sponsored...