Looking for a sub to put in my amps loop function

Maybe I’m missing something, but is the loop on your Peachtree before or after the volume control? 

If before, then whatever component is connected in the loop won’t have its volume controlled by the Peachtree’s main volume control. If this is the case, then you’d have to independently re-adjust the volume of your subwoofer every time you adjusted the main volume control knob, and that’s just not practical. 

But maybe I’m missing something... ?  

Duke

@audiokinesis

For example, Vandersteen 2WQ insert a capacitor to the loop to create a low frequency 6dB/octave roll off, and the subwoofer connected to the speaker output and the contour is opposite of the low frequency 6dB/octave roll off induced by the capacitor.

Audiokinesis is correct.  It will not work like that with the nova.  The peachtree volume knob will not change the sub volume.  There is no way to make it work.  I have talked to David Solomon about this when he was in charge at Peachtree.  
Not possible.

@contuzzi,

Please read the Vandersteen 2WQ manual:

https://vandersteen.com/media/files/Manuals/2wqmanual.pdf

You can insert the capacitor to the loop and connect a subwoofer to preout or speaker output as long as the subwoofer has a contour opposite of the low frequency 6dB/octave roll off induced by the capacitor.

Imhififan,

If I understand correctly, the Vandersteen hookup puts a 6dB highpass filter into the loop, and then the sub is AFTER the loop, and receives a speaker-level signal. The sub’s internal lowpass filter is the inverse of that 6 dB highpass filter. Is the right?

If so, that makes sense to me.

Perhaps I misunderstood hammy1750 when he said he "would like to add a subwoofer into the amps loop function to take the load of the 80Hz and below off of the amp and DQ-10s and onto the sub." I interpreted that to mean the sub’s line-level input and line-level highpassed output would be connected to the loop’s output and input respectively, which would have placed them in the signal path before the volume control.

Edit: Looks like we were typing at the same time.

Duke