testing for SDA effect

leftwinger57
leftwinger57 Posts: 2,917
edited October 2013 in Vintage Speakers
I saw a post the other day that someone did not hear any difference between the SDA effect using the I/C cable. Then hearing no difference w/o the cable and was hearing just a standard pair of nice speakers.I wondered about this and refered back to the SDA HANDBOOK and the test they say to perform to make sure the effect is working.According to the h/b on pages 32-33 it says tune into a radio station (monaural broadband signal as interstation noise) and then turn balance knob to the left and the only thing on the right that should be heard is the dimensional mid on the right side, ( which I did ) then reverse and again turn to the right and only to be heard is the left dd # 6511. So as far as my test went I think it passed but I do have an issue. I do not have a tuner that is built in to the pre/amp and have to use my Yamaha's tuner w/ it on audio mute. Is this ok, anything else I can do.I did recheck when I Liquid Nailed the seams that the drivers thanks to both the Handbook's pages and Darqureknights explanation are all in their correct orientation.Great diagrams btw......In my low voltage world black was always negative ,here in the Polk Universe black is positive on just about every speaker connection.
2chl- Adcom GFA- 555-Onkyo P-3150v pre/amp- JVC-QL-A200 tt- Denon 1940 ci cdp- Adcom GFS-6 -Modded '87 SDA 2Bs - Dynamat Ext.- BH-5- X-Overs VR-3, RDO-194 tweeters, Larry's Rings, Speakon/Neutrik I/C- Cherry stain tops Advent Maestros,Ohm model E

H/T- Toshiba au40" flat- Yamaha RX- V665 avr- YSD-11 Dock- I-Pod- Klipsch #400HD Speaker set-

Bdrm- Nikko 6065 receiver- JBL -G-200s--Pioneer 305 headphones--Sony CE375-5 disc
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  • oldrocker
    oldrocker Posts: 2,590
    edited October 2013
    Thanks for this information!!!!
    leftwinger57 wrote: »
    I saw a post the other day that someone did not hear any difference between the SDA effect using the I/C cable. Then hearing no difference w/o the cable and was hearing just a standard pair of nice speakers.I wondered about this and refered back to the SDA HANDBOOK and the test they say to perform to make sure the effect is working.According to the h/b on pages 32-33 it says tune into a radio station (monaural broadband signal as interstation noise) and then turn balance knob to the left and the only thing on the right that should be heard is the dimensional mid on the right side, ( which I did ) then reverse and again turn to the right and only to be heard is the left dd # 6511. So as far as my test went I think it passed but I do have an issue. I do not have a tuner that is built in to the pre/amp and have to use my Yamaha's tuner w/ it on audio mute. Is this ok, anything else I can do.I did recheck when I Liquid Nailed the seams that the drivers thanks to both the Handbook's pages and Darqureknights explanation are all in their correct orientation.Great diagrams btw......In my low voltage world black was always negative ,here in the Polk Universe black is positive on just about every speaker connection.
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  • nspindel
    nspindel Posts: 5,343
    edited October 2013
    For the record, as those wiser than me pointed out to me quite a while back.....

    SDA is not an 'effect'. If anything, interaural crosstalk is an effect, and SDA is the removal of that effect.
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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  • leftwinger57
    leftwinger57 Posts: 2,917
    edited October 2013
    Of course my logic would consider it adding an effect.I stand corrected.
    2chl- Adcom GFA- 555-Onkyo P-3150v pre/amp- JVC-QL-A200 tt- Denon 1940 ci cdp- Adcom GFS-6 -Modded '87 SDA 2Bs - Dynamat Ext.- BH-5- X-Overs VR-3, RDO-194 tweeters, Larry's Rings, Speakon/Neutrik I/C- Cherry stain tops Advent Maestros,Ohm model E

    H/T- Toshiba au40" flat- Yamaha RX- V665 avr- YSD-11 Dock- I-Pod- Klipsch #400HD Speaker set-

    Bdrm- Nikko 6065 receiver- JBL -G-200s--Pioneer 305 headphones--Sony CE375-5 disc
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  • F1nut
    F1nut Posts: 50,557
    edited October 2013
    SDA is not an 'effect'. If anything, interaural crosstalk is an effect, and SDA is the removal of that effect.

    That bears repeating.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • westmassguy
    westmassguy Posts: 6,850
    edited October 2013
    You can also perform the test without the balance control, IF your power amp has accessible gain control knobs like my Carver does.
    Getting to the Balance feature on my Pioneer AVR is a PITA. Play any low level source, doesn't have to be interstation noise, turn the right gain control all the way down. You should hear the left speaker clearly, and the right dimensional driver clearly as well. Repeat the same procedure with the left gain control.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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