Brianca is correct. You will just shunt the frequencies below 150 HZ to your sub.

If your speakers are fairly big (don't have to be _huge_) You might just try to set all your speakers except for the center to "large" and set the subwoofer to "off", and the crossover for the center speaker to 150Hz. On satellite and on older movies (especially mono ones) there is likely to be limited bass anyway, so your speakers should be able to handle what bass there is (again, if they are bigger than a breadbox). Just go easy on the volume, and don't play "Pearl Harbor" or "Twister" like this or you will surely frag your speakers! And of course, you would need your subwoofer for films such as these.

I get a useful, if not huge benefit by setting my center in this manner. It would work better if the crossover point were adjustable up to about 250Hz or so, but give it a try.

[This message has been edited by soundhound (edited November 08, 2002).]