AVR crossover question

pearsall001
pearsall001 Posts: 5,327
edited February 2010 in Electronics
I know that crossover settings are not brick walls & have a gradual slope. For instance, if the AVR crossover setting is at 85hz how much is still bledding thru below & above that point. Set at 85hz would it go as low as say 75hz & as high as 95hz? Or maybe my numbers are way off. Curiousity has the best of me.
Post edited by pearsall001 on
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  • kuntasensei
    kuntasensei Posts: 3,263
    edited February 2010
    Rather than rehash anything, check out this page:
    http://en.wikipedia.org/wiki/Linkwitz-Riley_filter

    I'm greatly simplifying, but typical AVR digital crossovers are made to mimic 2nd order Linkwitz-Riley analog filters, so figure 12dB/octave. So if you set a crossover to 80Hz, response at 40Hz will be reduced by approximately 12dB. That's why you don't want to set crossovers too close to the speaker's -3dB point. You're still getting some output well below that, so you need to give it some transition room.
    Equipment list:
    Onkyo TX-NR3010 9.2 AVR
    Emotiva XPA-3 amp
    Polk RTi70 mains, CSi40 center, RTi38 surrounds, RTi28 rears and heights
    SVS 20-39CS+ subwoofer powered by Crown XLS1500
    Oppo BDP-93 Blu-ray player
    DarbeeVision DVP5000 video processor
    Epson 8500UB 1080p projector
    Elite Screens Sable 120" CineWhite screen
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