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Crossover frequency for Velodyne/Bowers & Wilkins

Beginners and Audiophytes - forums.audioholics.com
Hi guys, I've just built a 5.1 home theatre in a 28 sq m/ 110 cu m room (domed ceiling) It consists of B&W 683's/HTM61S2/686S2's and Velodyne wi q 12 subwoofer (wired) with Denon X2200W avr. The physics and mathematics of acoustics/frequency/decibels etc eludes me but I'm trying to configure nonetheless based on trial and error (probably the best way anyway). I have a specific question on crossover frequency. The velodyne manual gives an example of calculation as follows

'If you don’t know the low frequency limit of your main speakers, use 80 Hz as the crossover

point (this happens to be the default on the AVR) . For example, the main speaker specs might include an entry similar to the following:

“3 dB down at 45 Hz

In this example, double the 45 Hz value and use the 90 Hz doubled-value as the crossover

frequency'

The B&W 683 manual shows frequency lower limit as -6b at 30 Hz. So should I ignore the Db drop difference (-3 example vs -6 actual) and use 2 x 30 = 60hz as the crossover- or is the rough calculation actually more complex?? And are the considerations different for different types/sources andsub types eg Bluray/DVD/Cd/Vinyl DTS/Stereo/Multi Channel/Xlassical/Pop/folk etc? Many thanks for any comments.


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