OK. The manual for the PV11 indicates a nominal output impedance of "less than 500 ohms" (presumably at mid-range frequencies), and recommends a minimum load impedance of 10K ohms. Given that output impedance and the short length of the cables to the amps the added capacitance of line-level interconnects that would connect the preamp to a sub won’t be an issue, for any reasonable length. But I would look for a sub providing a line-level input impedance of at least 20K, as the parallel combination of 20K and the 22K input impedance of your amps results in an overall load impedance that would be seen by the preamp of:
(22 x 20)/(22 + 20) = 10.5K.
Unfortunately the specs I can recall for many of the REL models indicate line-level input impedances of 10K, which with the 22K input impedance of the amps would result in a combined load impedance of only 6.9K, well below CJ’s 10K recommended minimum for the PV11. The SVS SB-1000 that was suggested has a line-level input impedance of 47K, which would be great. Some of the relatively expensive JL Audio models have unbalanced line-level input impedances of 50K, although if I recall correctly the input impedance of some of their other models may be too low to be acceptable. You may have to contact some of the other manufacturers that have been suggested to determine the input impedance, if it isn't indicated at their website or in the manuals that are provided online.
Good luck. Regards,
-- Al
(22 x 20)/(22 + 20) = 10.5K.
Unfortunately the specs I can recall for many of the REL models indicate line-level input impedances of 10K, which with the 22K input impedance of the amps would result in a combined load impedance of only 6.9K, well below CJ’s 10K recommended minimum for the PV11. The SVS SB-1000 that was suggested has a line-level input impedance of 47K, which would be great. Some of the relatively expensive JL Audio models have unbalanced line-level input impedances of 50K, although if I recall correctly the input impedance of some of their other models may be too low to be acceptable. You may have to contact some of the other manufacturers that have been suggested to determine the input impedance, if it isn't indicated at their website or in the manuals that are provided online.
Good luck. Regards,
-- Al