AV Receiver that deals with 6ohm speakers

I'll second Bill's comment. This excerpt from a Sound&Vision.com review seems to third it:

Impedance of the RX6 is a little low but not low enough to cause problems for any decent receiver or amp; minimum is 3.9 ohms at 150 Hz. The RX Centre’s impedance is a little more demanding, with a low of 3.0 ohms at 200 Hz. The RXFX is easy to drive, with a 4.8-ohm minimum impedance at 2.6 kHz, and a nominal impedance of 8 ohms. Sensitivity of all speakers is about average.

The NAD should be fine.

Marty

Once again, Stereophile confirms (excerpt from link, above);

Its impedance (fig.1) remains above 6 ohms for almost the entire audioband, with a minimum value of 4.5 ohms at 165Hz. As well as being usefully sensitive, the RS6 is also an easy load for the amplifier to drive: textbook requirements for a speaker that will be used with inexpensive amplification.

NAD may want to cover their ass with the 8 ohm warning, but it's almost impossible to believe that this speaker will stress the power amp in the NAD. I'm sure that there are examples of (nominal) 8 ohm speakers out there that will be tougher to drive than these.

Marty

Sorry.

My bad read on the model # in the linked review (I assumed the link was for the speaker in question). Tls also makes a good point about disregarding a recommendation.

However, not all nominal 6 ohm loads are created equal, and I'm sure NAD's "CYA" 8 ohm warning is designed to minimize the likelihood that the T748 might see a really rough patch from a nominal 4ohm speaker. The RS6, per the review, looks to be a very benign load. Given the common provenance of the RS and RX, I kind of doubt that the RX6 and it's center/side companions would be a problem for the NAD, but I certainly cannot say that for sure, so...

as Tls points out - it's not entirely without risk.

Marty