B&K AVR 707, Руководство пользователя

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BKcSuite System Settings - Audio
Room Resonance (Notch Filters)
No speaker has perfectly flat frequency response. These deviations in frequen-
cy response contribute to each speaker's characteristic sound. This is why one
speaker might be preferred over another. When a speaker is put into a room
with walls, floor and a ceiling, reflected sounds can cancel or reinforce one
another which further alters the frequency response.
At higher frequencies, hundreds of small peaks and dips can be measured in
the frequency response. Attempts to remove all these small deviations would
result in colorations to the sound that may not be desirable. The characteristic
sound that made the particular speaker(s) attractive could be completely lost.
Even if the hundreds of small peaks and dips would be adjusted, it would only
be correct for a single position in the room. Moving your head just a few inch-
es would require a completely different set of corrections.
At low frequencies, the picture is different. There are fewer peaks and dips, but
they are much more dramatic. The peaks and dips persist over a much larger
portion of the listening area. Dips can't be corrected electronically. Putting out more power at the dip frequency won't help. If the original and
reflected waves cancel each other, they will cancel at 1 watt or 1000 watts. If you have 1 watt dips in the frequency response you can try repo-
sitioning your speakers, particularly the subwoofer. Fortunately, dips in the bass response are typically not that noticeable. When an instrument
plays that particular frequency, the bass is lost, but the higher harmonics of the instruments tone are still there. To some degree, your ear and
brain will fill in the missing information.
See the following page to set up the notch filters.