What is cross-over frequency in sub-woofer??

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ABC asks:


>Hi All,
>I recently bought a ELAC cinema studio 5.1 speakers.


>The subwoofer has options to select/change db level and cross-over
>frequency.
>What is the the cross-over functionality? How is it useful?


Since the room your speakers will be in is unknown to the people who
made them, they want you to have the ability to make them blend well
with th subwoofer. To facilitate that you have choices for crossover
frequency and a volume knob to make the sub louder or quieter in order
to match the main speakers. The best way to accomplish this, is to go
over to Radio Shack and purchase one of their analog SPL meters. Next
you play test tones through the speakers and turn the vloume up to 75
dB. Next play some test tones through the sub and match the levels.
Preferably, you have tones at specific frequencies, so you can see if
you have any bumps or dips in response, so you can set the crossover to
eliminate them if possible.

http://www.svsubwoofers.com/faq.htm#moviedemos has a lot of useful
information on how to properly integrate a subwoofer. The SPL meter I
spoke of is shown there and you will need it to set the level of your
surround speakers so they are also set to the same SPL as the main
speakers.

Archived from groups: rec.audio.tech (More info?)

Thank you all for your replies , that sure was helpful

-preethz