See this thread http://forum.beoworld.org/forums/thread/76526.aspx for alternatives to Beolab 2.
I use a 100 € non B&O Sub connect via DIN/RCA cable to my BV 3-32 DD module.
Ralf
My Beo: Beosound 3000, Beolab 4000, Beo 4 DVD, Beolab 5000/Beomaster 5000, Beovox S45.2 with Stands, Beosystem 7000 black with Beolink 7000, Beolink 1000, F1000 (3 cubes), Beovox 5000, Beovox 3000, Attyca 1.