REL and Vandersteen are two audiophile quality subs which will work tremedously well with either two channel or HT applications. I am using twin Vandersteen 2W's (older model, but excellent quality. Built in non-limiting 300w amps, so no need for external amp)and they blend utterly seamlessly with planars/hybrids.
Insist on a pair of subs; some may arue it, but twin subs offer a distinctly better listening experience. Used Vandy 2W's are around $6-700.00 and should come with X-2 crossover (a must for proper operation; they allow you to adjust your sub settings to match whatever amp you are running)!
Insist on a pair of subs; some may arue it, but twin subs offer a distinctly better listening experience. Used Vandy 2W's are around $6-700.00 and should come with X-2 crossover (a must for proper operation; they allow you to adjust your sub settings to match whatever amp you are running)!