It is theoretically possible but not easy. The output from the BC7000 is amplified so you will need a step down - some sub-woofers will have that built in. You will then need to power the S45-2s - I think you are planning to use the Speaker 2 for another room so either you will need to wire them to the BC7000 or to the outputs on the subwoofer - but these are likely to be at variable line level so you will need an amplifier! Get S75s if you want more bass! The S45-2 bass is very accurate but does not extend as far. Are you using the loudness control and the tone controls?

Yes I'm using the loudness and tone control.  What about a passive subwoofer?

Not many passive subs left out there unless you build one yourself, and even then passive sub crossovers are problematic. Take huge inductors which are hard to do properly, and the passive high pass can really muck with the sats if not tailored to them, and still running all the most important parts of the music thru the huge caps and inductors needed doesn't really do it any favors.

Many active subs have speaker level inputs, just need to check before you buy, but then when you have speakers that go fairly low in the bass merging the two is not as easy as you might imagine, or the sub vendors say it is.

Keep a look out for a Beovox Cona Phil!!!!

You can check out the spec and read a user appraisal in the products section of this site.

Regards,

Nick

There's currently one in black on ebay Germany:

http://www.ebay.de/itm/Bang-Olufsen-BeoVox-Cona-Passiver-Subwoofer-/201325991601?pt=LH_DefaultDomain_77&hash=item2edff6d6b1