SDA's and Listening Position

Hypnotoad
Hypnotoad Posts: 44
edited November 2010 in Vintage Speakers
I have had my SDA 1C's for a while now, I find if I sit dead center about 8 feet back the sound is more centered and the SDA effect not as pronounced.

But if I sit a little to either side of center the SDA effect is much more pronounced. Anyone else experienced this, I am thinking the volume of sound in the middle is somewhat overpowering the SDA effect.

Or is it just mental illness on my part?:eek:
ProJect Perspective II Turntable & Benz Micro Ace
ProJect Tube Box II & Philips/Amperex tubes
Luxman L-430 Integrated
Polk SDA 1C's
Post edited by Hypnotoad on
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Comments

  • Joe08867
    Joe08867 Posts: 3,919
    edited November 2010
    They should form a perfect pyramid. Just cause your back eight feet means nothing if they are further apart or closer together than 8 feet.
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  • newrival
    newrival Posts: 2,017
    edited November 2010
    It sounds to me like your speakers are too far apart. What you are describing sounds like a "hole" in the soundfield due to a)you being too close, or b) them being to seperated. The SDA whitepapers state that your listening distance "should be equal to, or greater than the distance between (the speakers)." So as Joe was stating, an equilateral triangle would work better, and is the closest you should be to the vertical plane of the speakers.
    design is where science and art break even.
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  • Hypnotoad
    Hypnotoad Posts: 44
    edited November 2010
    newrival wrote: »
    It sounds to me like your speakers are too far apart. What you are describing sounds like a "hole" in the soundfield due to a)you being too close, or b) them being to seperated. The SDA whitepapers state that your listening distance "should be equal to, or greater than the distance between (the speakers)." So as Joe was stating, an equilateral triangle would work better, and is the closest you should be to the vertical plane of the speakers.

    You and Joe were exactly right, I measured them and there is eight feet between them, nine feet from center to center. I moved the couch back and when sitting I am ten feet back and it has fixed the problem. I was way too close, they sounded good but like I said it messed up the SDA effect. I thought they sounded good before but now they sound even better. Thanks everyone for the advice.
    ProJect Perspective II Turntable & Benz Micro Ace
    ProJect Tube Box II & Philips/Amperex tubes
    Luxman L-430 Integrated
    Polk SDA 1C's
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  • newrival
    newrival Posts: 2,017
    edited November 2010
    Glad to hear youre now in the sweet spot ;)
    enjoy em!
    design is where science and art break even.
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  • dpowell
    dpowell Posts: 3,068
    edited November 2010
    Now on to the next important question. Have you modded them yet? :)
    ____________________________________________________________

    polkaudio Fully Modded SDA SRS 1.2TLs + Dreadnaught, LSiM706c, 4 X Polk Surrounds + 4 X ATMOS, SVS PB13 Ultra X 2, Pass Labs X1, Marantz 7704, Bob Carver Crimson Beauty 350 Tube Mono Blocks, Carver Sunfire Signature Cinema Grande 400x5, ADCOM GFA 7807, Panasonic UB420, Moon 380D DAC, EPSON Pro Cinema 6050
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  • Tony M
    Tony M Posts: 11,151
    edited November 2010
    AHHHHH..

    The sweet spot...

    How great it is.:biggrin:
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • inspiredsports
    inspiredsports Posts: 5,501
    edited November 2010
    Hypnotoad wrote: »
    You and Joe were exactly right, I measured them and there is eight feet between them, nine feet from center to center. I moved the couch back and when sitting I am ten feet back and it has fixed the problem. I was way too close, they sounded good but like I said it messed up the SDA effect. I thought they sounded good before but now they sound even better. Thanks everyone for the advice.

    If you have the depth, you might even try moving even a few more feet back just to see what you think.
    VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
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  • AudioGenics
    AudioGenics Posts: 2,567
    edited November 2010
    Hypnotoad wrote: »
    ... either side of center the SDA effect is much more pronounced. ... the SDA effect.....

    side to side (horizontal)
    up and down (vertical)
    front to back ( what would one call that ? proximity ?)

    will seemingly change the " SDA effect " .
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  • [Deleted User]
    [Deleted User] Posts: 1,225
    edited November 2010
    tony millard wrote: »
    AHHHHH..

    The sweet spot...

    How great it is.:biggrin:

    Dang, you stole my thunder. :eek:
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  • EndersShadow
    EndersShadow Posts: 17,590
    edited November 2010
    tony millard wrote: »
    AHHHHH..

    The sweet spot...

    How great it is.:biggrin:

    That's what she said....:tongue::wink::biggrin:
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • [Deleted User]
    [Deleted User] Posts: 1,225
    edited November 2010
    Now, now. :cool:
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  • EndersShadow
    EndersShadow Posts: 17,590
    edited November 2010
    nap wrote: »
    Now, now. :cool:

    Sorry, its the pain meds kicking in....

    Actually more than anything I am jealous. Trying to get up to Nooshins to get my ears on a pair of SDA's myself...

    Glad you got them dialed in, from what I heard its the beginning of an audio Nirvana
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Hypnotoad
    Hypnotoad Posts: 44
    edited November 2010
    dpowell wrote: »
    Now on to the next important question. Have you modded them yet? :)

    They have that mortite stuff on the drivers. Not sure about the crossovers, need to check them out.
    ProJect Perspective II Turntable & Benz Micro Ace
    ProJect Tube Box II & Philips/Amperex tubes
    Luxman L-430 Integrated
    Polk SDA 1C's
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