subwoofer for my setup

this_is_vv
this_is_vv Posts: 24
My speakers are Vienna acoustics haydns...i need to get a sub as they dont go low...max they go is 42 Hz...can anyone recomend sub to be used ... the setup is

Pc-> Peachtree decco2 dac (Tube preamp)-> Yaqin ms-34d -> VA haydn speakers...

which sub to get and where to put it seeing lot of good polk dub on sale...currently i am talking to guy for NHT subone or NHT subtwo...

V