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Thread: Hey Dr. Spec

  1. #1

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    Default Hey Dr. Spec

    Where did you end up setting the high pass on your 1000's?
    Fronts - LS-90
    Center - CS-400i
    Sides - FX-1000
    Rears - AB755 (2)
    Sub - SVS 25-31 PC-Plus
    Amp - B&K AVR317

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    Default Re: Hey Dr. Spec

    Originally posted by wallstreet
    Where did you end up setting the high pass on your 1000's?
    80 Hz all around. Works great for music and movies. High pass filter rate is 12 dB/octave on the 3803. Let's all the speaks play down to around 55-60 Hz pretty strong.

    Blends great with the sub at that frequency. Plus, 80 doesn't lop off anything from the LFE channel. Any lower and it would since the LFE channel is summed through the bass management circuit on the 3803 and cannot be controlled separately.

    Love the 1000's BTW - thanks again.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    so you set all speakers to small with a high pass of 80hz? (that's thx spec btw)

    I just got my avr-307, so i'll be playing around with these settings over the next couple of days.
    Fronts - LS-90
    Center - CS-400i
    Sides - FX-1000
    Rears - AB755 (2)
    Sub - SVS 25-31 PC-Plus
    Amp - B&K AVR317

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    Originally posted by wallstreet
    so you set all speakers to small with a high pass of 80hz? (that's thx spec btw)

    I just got my avr-307, so i'll be playing around with these settings over the next couple of days.
    That's correct. 80 works extremely well for both HT and music IF you have a great sub. Again, this still allows the high passed speaks to play much lower than that for a smooth transition to the sub.

    I think you can adjust the filter rates on the B&K in addition to the xo frequency. I recommend 12 dB/octave for the high pass and 24 dB/octave for the low pass. That is the THX standard.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    I'm still subless though. With this latest purchase, I'll be subless for awhile longer.:(
    Fronts - LS-90
    Center - CS-400i
    Sides - FX-1000
    Rears - AB755 (2)
    Sub - SVS 25-31 PC-Plus
    Amp - B&K AVR317

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    That's a GREAT AVR, though. Good purchase!

    You can use the LS90's as your sub if you set the mains to large and the sub to no/off and the other speaks to small.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    That's how I ended up with the initial config. I haven't made it to the equilazation yet. Sound improvement was remarkable over the old Denon running DPL.
    Fronts - LS-90
    Center - CS-400i
    Sides - FX-1000
    Rears - AB755 (2)
    Sub - SVS 25-31 PC-Plus
    Amp - B&K AVR317

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    Originally posted by wallstreet
    Sound improvement was remarkable over the old Denon running DPL.
    That's the understatement of the day.
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    can someone tell me the frequency difference between octaves? I'm assuming it's variable, what's the equation?

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    Double the freq number (or halve) per octave.

    40 Hz is 1 octave lower than 80Hz. 60Hz is 1/2 octave lower than 80Hz.

    4000 Hz is 2 octaves higher than 1000Hz, 1 octave higher than 2000Hz.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.

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    BTW, Russman, do you an Avia test disc and a spl meter I could borrow?
    Fronts - LS-90
    Center - CS-400i
    Sides - FX-1000
    Rears - AB755 (2)
    Sub - SVS 25-31 PC-Plus
    Amp - B&K AVR317

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    Originally posted by wallstreet
    BTW, Russman, do you an Avia test disc and a spl meter I could borrow?
    I'm sure Rooster can cook you up something.

    Failing that, I'll send you my Avia and you can return it when you're done, if you want. The RS meter was recently on sale for only 25 bones - including an extra 9v battery.

    The B&K test tones are quite good, though, as I calibrated a 507 with Avia and then compared to the internal tones and they were very close (within 1-2 dB).

    The digital Video Essentials coming in September will be a MUST BUY, though. Only $19 and it does 6.1 and has a bazillion HDTV and FP calibration tests.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    Originally posted by RuSsMaN
    40 Hz is 1 octave lower than 80Hz. 60Hz is 1/2 octave lower than 80Hz.Cheers, Russ
    Good one.

    Russ' post brings into focus that with an 80 Hz high pass and a 12 dB/octave filter rate, any speak set to small will only be artificially 6 dB down at 60 Hz.

    You don't want your speaks to start naturally rolling off at the same time they are being artificially filtered. Otherwise it will cause a depression in the FR at that point.

    I like to see a -3dB point of 50-55 Hz for any speaker being high passed at 80 Hz. They really need to be pretty bass capable. The 1000's can handle it, no problem.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    Wall,

    I have a meter, you're more than welcome to use it, but for $25, I'd just bag one. They are nice to have, esp when you go to demo gear, so you have an idea of what the rig sounds like at *your* reference level.

    Never used a meter or setup disc for ht, always by ear.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.

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    thanks for the octave info, that makes so much sense now.

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    http://www.radioshack.com/product.as...5Fid=33%2D2050

    Here's the Rat Shack meter link. I may even bag one for $25 as a back up to the B&K.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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