Nice article Peete.
I will definitely consider getting a sub if I don't have to add a receiver to my current setup.
My preamp is a RSA Apache http://www.raysamuelsaudio.com/products/apache and power amp is a Rotel RB-970BX http://www.rotel.com/content/manuals/rb970bx_eng.pdf .
I have used the RCA line out from the preamp to feed the power amp while the preamp is fed with balanced outputs from my DAC.
The preamp has a set of balanced outputs as well that are not being used.
Nice preamp....you can do this 1 of 2 ways. If the RSA's balanced outs are active at the same time as the SE'd outputs are then look for a Sub that can accept balanced input (ideally speaking a set of L/R subs in true stereo mode )....the second method is to use the SE'd outputs to the subs ( again 2 of them would ideal) and with the signal pass through of the sub plate amps (you'll need a pass through as feature of the sub amp in order to do this) you then run those on to your Rotel amp. The best method is to get a hold of an outboard xover (active) like the Paradigm X-30 or the Velodyne SMS-1 system (for use with your choice of sub).
This is another excellent article worth reading http://sound.westhost.com/project48.htm
Edited by Pricklely Peete - 6/20/11 at 1:12pm