bridging integrated amplifier

Rome2000, contacting Nad sounds like a good idea as mentioned above, if you really think it can be done. But, bridging your receiver would not be a good idea in my opinion either. If it would work, it would change the impedance to 16 ohms, not 8 ohms. Definitely don't try it, without asking NAD first.

Receivers don't normally have do not have balanced outputs to my knowledge, and are not capable of bridging.

Bridging a lot of amplifiers is not an option either.

I've never seen a receiver that has outputs that can be bridged, at least that I can remember. A company that makes amplifiers commonly will tell you the option and mention its connections in the manual, but I don't see that in your manual, that's available to everyone on the net. A lot will print it on the amp (receiver in this case) by the speakers connections.

Maybe Spectron has some unique designed receivers.

01-13-12: Sandstone
If you want both channels output through a single speaker rated at 8 ohms, you could just connect it conventionally via one set of speaer terminals, then set NAD's speaker impedance selector to 8 ohms, and then press the "Mono" selector button on the front right panel of the receiver, to merge stereo signals into a single mono output.
Do you actually need to double the power output, anyway?
Sandstone (Answers | This Thread

Doing this will let the receiver sort of act as a 8 ohm monoblock amp from the way I view the schematic. I don't see it as acting a bridged amp.

but I have single large bookshelf that can take up the same space and would give me more low end. I was looking to take advantage of the power options from the stereo but rather not risk off wiring.
Rome2000 (Threads | Answers | This Thread)

Make sure the speaker is rated at 8 ohms for the 8 ohm setting. If it is a 4 ohm speaker, use the 4 ohm setting. Otherwise, the one channel it's running on can overheat and get damaged. Using the mono setting will make sure you hear both left and right channels, through the single speaker.