SVS PCi 22-31 FR Sweep

VR3
VR3 Posts: 28,647
edited April 2004 in Subwoofer Hookup & Bass Management
Here it is...

Just how I thought it would be...lol

79 is supposed to be 5...

I couldnt find a way to change the Y axis...sorry

My room is the definetion of bad room acoustics...
- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • gatemplin
    gatemplin Posts: 1,595
    edited April 2004
    I have a very similar FR curve but a much different room. Null at 75, peak at 50. Are those corrected? just checking.

    You should consider changing location (obviously) or a BFD to knock down the hump, boost the null (a little) and maybe a little house curve for good measure.
    Graham
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  • pjdami
    pjdami Posts: 1,894
    edited April 2004
    I don't think he corrected. I just sent him the spreadsheet and we will flip it around. He should be reposting in about 30 minutes.
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    Here it is -- with correction factors..

    Phase - 45, sounds best (to me, maybe not the computer)
    X0 - 80hz
    Hook up - LFE
    Gain - 12 oclock
    Sub gain on preamp - 0
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    Here is the graph at 0 degrees
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    Sweep 180 Degrees -- much flatter, still have that dip and i lost low end extention...
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • PolkWannabie
    PolkWannabie Posts: 2,763
    edited April 2004
    Don't you have your preamp's X/O set at 60 hz ? i.e. the sub ain't gonna help at 80 hz !?
    Rick
    HT+ Sunfire TG IV, Dual CG Sig II's, CinePro 1K2, Oppo 981, Audio Technica PL120, Polk SRT's & F/X1000's, Samsung 71" DLP
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    I'm getting to that bob...h/o a second...

    180 degrees, 60hz crossover
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • PolkWannabie
    PolkWannabie Posts: 2,763
    edited April 2004
    Bob ?

    Ok Sam ...
    Rick
    HT+ Sunfire TG IV, Dual CG Sig II's, CinePro 1K2, Oppo 981, Audio Technica PL120, Polk SRT's & F/X1000's, Samsung 71" DLP
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    90 degrees (not 45, and the first graph isnt 45, its 90) - 60hz
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    hehe...bob is just a name i call everyone...

    I have a big surprise...i ran them on full range -- i'll show that graph in a second...LOL
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • steveinaz
    steveinaz Posts: 19,538
    edited April 2004
    Looks like Phase at "0" is best Sponge-Sid. Make sure you only mess with 1 "parameter" at a time, ie..mess with XO first, once its done, then move on to level, phase, etc...step by step. It will reduce alot of confusion.

    Another thing I noted was that moving my sub just a few inches different from where previous measurements were taken--made a difference, in other words--keep the sub in the same spot everytime or your graphs won't be consistent.

    Remove as many "variables" as possible, and it will be alot easier; I did mine i this order:

    1. Set crossover until flatest curve was attained.
    2. Adjusted phase if needed
    3. Adjusted sub "level" to be consistent with main speakers
    4. Experiment with blocking ports, etc..

    EDIT TO ADD: WROTE DOWN ALL SETTINGS AND SUB LOCATION FROM WALL IN INCHES....lol
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    0 Degrees, 60hz
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    This chart...most definetely explains why I had so much bass with speaker wire, full range -- 70hz crossover, 180 degrees. I moved things, and this chart explains... hits VERY LOW, VERY HARD..

    and hits very hard at most all levels. I LOVE THIS CHART...BUAHAHAH SWEETNESS!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,647
    edited April 2004
    Here is the last chart, 70hz, full range - 90 degrees
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited April 2004
    Well, I've met my minimum daily requirement for charts...

    That 180 deg setting ain't bad... Off 3 dB around 20 Hz. Nasty room notch around 85 Hz seems to be the one constant.
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • pjdami
    pjdami Posts: 1,894
    edited April 2004
    That 180 deg setting ain't bad... Off 3 dB around 20 Hz. Nasty room notch around 85 Hz seems to be the one constant.

    Yeah, what Tour said:)

    Sid, you can try the crossover the other way (90 hz.. another tip Doc gave me) for that null at 85 hz. But overall pretty good. Might need to relocate the sub as well but if it sounds good really up to you.

    Sid,

    Believe it or not, you have just undertaken an exercise in the practical application of basic algebra. The spreadsheet I sent you uses the formula for interpolation of coordinates between two points in two dimensions. I don't know if you have taken algebra yet, but this is an example of the formulas practical application to get the correction factor for the Radio Shack meter at test tones "in-between" the published values. This does assume that the correction is linear though (which isn't a bad assumption at that small of an interval).

    I interpolate all the time at work actually for my job. Steam tables that is.....

    Nice looking curve though you little rascal;) I don't know why the spreadsheet flipped the chart around and put a gray background. Might be something to do with my newer version of Excel or something. Have fun with it and enjoy the sub now.
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited April 2004
    Originally posted by pjdami
    I interpolate all the time at work actually for my job. Steam tables that is.....
    Steam tables??? I'll bet you still use a slide rule, too... ;)
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • pjdami
    pjdami Posts: 1,894
    edited April 2004
    Steam tables??? I'll bet you still use a slide rule, too...

    LOL.. no slide rule for me Tour. Steam tables yes. I've been working on a steam desuperheater optimization and still use the good ole steam tables w/ enthalpy balances manually.

    Anyhow, I was trying to emphasize the importance of algebra in the derivation of the correction factor chart. Hopefully, the "youngster" could appreciate some value in education and the opportunities that it may provide for him if he takes high school / college seriously.

    However, I realize at the same time that school isn't for everybody. But he seems to be a bright chap.
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  • I-SIG
    I-SIG Posts: 2,243
    edited April 2004
    Originally posted by pjdami
    But he seems to be a bright chap.

    No comment...:D

    Wes
    Link: http://polkarmy.com/forums

    Sony 75" Bravia 4K | Polk Audio SDA-SRS's (w/RDO's & Vampire Posts) + SVS PC+ 25-31 | AudioQuest Granite (mids) + BWA Silver (highs) | Cary Audio CAD-200 | Signal Cable Silver Resolution XLR's | Rotel Michi P5 | Signal Cable Silver Resolution XLR's | Cambridge Audio azur 840C--Wadia 170i + iPod jammed w/ lossless audio--Oppo 970 | Pure|AV PF31d
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