B&K 507 Crossover issues/subwoofer/low freq issues

[eieio]

B&K 507 Crossover issues/subwoofer/low freq issues
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i have a new 507 B&K receiver and have the following question regarding the low frequency crossover:

in a 5.1 system, if you set all speakers to small, and set the crossover to 45 Hz, then in theory, everything below 45 goes to the sub, and everything above 45 goes to the various speakers. there are many people out there who believes that the ".1" channel (the LFE channel)'s information does not get "mixed in" and does not go to the main fronts.

example: for the crossover to be at 45 Hz, then everything in the LFE channel from any DVDs from 45 Hz up to 80 Hz will be lost, according to many people. But i've even called B&K about this, and they seem to say, with a tone of confidence, that they are pretty sure that that is NOT happening with their receiver/processor. they say that the LFE above 45 Hz in the above scenario will actually get "mixed in" with all the rest of the info, and everything above 45 hz from the LFE will find its way into the front mains, since the front mains is responsible for everything above 45 hz.

anyone knows more about this please?

thanks!

[PMazz]

Well, that's certainly not how it's supposed to happen. The whole idea of the small speaker setting is to relieve the speakers from the ultra low freqs. The LFE channel is supposed to be just that, another channel of information. Bass management is another story. Of course, the xover is not a brick wall filter. It's a 24 dB HP and a 6 or 12 dB LP, depending on the setting. Rule of thumb, BTW, is to use a xover point at least an octave above the LF reach of your speakers for good integration.

BTW, the LFE channel has an upper range of 120 Hz, and that is a brick wall filter. Although there's rarely much info recorded to the LFE channel up that high.

Pete