On Mon, 19 Aug 2013 18:31:03 +0100, Steve wrote:

the range of human hearing is 20Hz to 20 KHz and many sound cards
support LFE (Low frequency extensions)

Low Frequency Effects, the bangs and thumps. Don't think it goes any
lower than the other five channels that are full bandwidth. The LFE
has an uuper frequency limit around a few hundred Hz. Just means you
have signal to augment the existing LF in the main channels by giving
it a bit of welly into decent sub-woofers.

But any sound card ought to cope with 50 Hz no problem.

--
Cheers
Dave.