Speaker Level and LFE Sub?

Its a combined system. (NAD M2 for 2 channel via AES/EBU & Parasound P7 surround preamp outputing the .1 to the same sub and the left and right surround to NAD M2 via interconnect) So, technically I don't really need simultaneous use of line and speaker level inputs. However, if the manufacturer won't certify this particular use, I could destroy my amp with conflicting grounding. That is, i would have a connection coming from the NAD and different connection coming from a surround preamp. Also, I don't know how the sub would handle two inputs coming in at the same time. So, you are correct that I don't need to listen to line and speaker level at the same time, but its going to happen anyway when I am using the NAD M2 for my surround fronts and my preamp is sending LFE at the same time.

Yo Big D, or as we in Houston like to call Dallas, that little city in South Oklahoma, I am going to do the exact same thing that you are, that's how I discovered the Def Tech's could handle that.

I suggest you do as I did, and call the very nice folks at Def Tech and ask them about it. They were great to work with and described in detail how this would work, and said it would be no problem at all.

Good luck.

I really doubt there is a grounding problem here but I suggest you contact NAD since the M2 is the only strange item in this setup. None of the other items will be a problem.

Kal

Thanks. I really like the m2 but it's just a shame NAD couldn't provide a simple line out. NAD has documentation on sub integration but much will depend on the sub itself. I think it's best to contact individual manufacturers. I live in Dallas but I am really an Htown boy.

I narrowed things down to Def Tech's Supercube Reference and Martin Logan's Depth. I will get the reference. ML never responded to my question. However, Def Tech responded with the following answer:
"It would be quite acceptable to connect an LFE cable to our SuperCube subwoofers while connecting a set of high level inputs to the subwoofer. The subwoofers would combine or sum together any bass they receive from the speaker wires with any bass they receive from the LFE cable. The subwoofers would then play any – and all bass they receive."

thanks for all of your help.