Sansui AU-517 & SDA 2A's

try1256
try1256 Posts: 26
edited November 2013 in Vintage Speakers
Hi all, This is my first post to the Polk forum. I recently came across an pair of SDA 2A's. They are in pretty rough condition but will make for a nice restoration project. I have read a considerable amount regarding them on this forum and others. I would
like to pair them with my Sansui AU-517 amp. I have read that you can't use the SDA function with amps that are not common ground or dual mono amps. The Sansui is dual mono, but when I check continuity between the neg. speaker terminals I get a reading. Has anyone else used a Sansui 517 or 717 to drive their SDA's? Thanks for the input.

Tim
Post edited by try1256 on
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Comments

  • Phasewolf
    Phasewolf Posts: 514
    edited November 2013
    As long as you get a very low reading between the neg terminals you will be fine. And by low I mean below a ohm.
    Absolute corruption empowers absolutely.

    Lg 55LW5600 TV
    Onkyo PR-SC 5508
    Legacy Audio Focus SE
    Legacy Audio Silverscreen HD center
    Polk F/X500i Rears
    Parasound HCA-3500
    Sunfire Grand Cinema
    Behringer iNUKE NU6000DSP
    Pair of CraigSUB SS-18.1
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  • try1256
    try1256 Posts: 26
    edited November 2013
    Checked it and I get about 1.5 ohms. It's the same on my Yamaha and Marantz amps. Is 1.5 to high?
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  • Phasewolf
    Phasewolf Posts: 514
    edited November 2013
    You should be fine. I am betting if you touch the DMM leads together you will get around the same not all leads work too well. If you are getting that same reading on several amps that you know are common ground like every avr I have ever seen the issue is the leads and the all should be fine.
    Absolute corruption empowers absolutely.

    Lg 55LW5600 TV
    Onkyo PR-SC 5508
    Legacy Audio Focus SE
    Legacy Audio Silverscreen HD center
    Polk F/X500i Rears
    Parasound HCA-3500
    Sunfire Grand Cinema
    Behringer iNUKE NU6000DSP
    Pair of CraigSUB SS-18.1
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  • Mr. Bubbles
    Mr. Bubbles Posts: 736
    edited November 2013
    Welcome to the forum. Congrats on the speakers. That is an awesome model to start with. One of my favorites.
    If con is the opposite of pro, is Congress the opposite of Progress?!


    Monitor 5Jr, Monitor 5, RTA12, RTA 15TL, SDA 2A, 1c, SRS 2, 1.2TL, CRS, Atrium.
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  • PolkieMan
    PolkieMan Posts: 2,446
    edited November 2013
    Read this to learn more about what you have.

    http://vr3mods.com/uploads/SDA_Handbook_2011_Rev2.pdf
    POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
    POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
    PIONEER PL-510A SONY BDP S5100
    POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
    ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
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  • drumminman
    drumminman Posts: 3,396
    edited November 2013
    Congrats on the speakers and welcome to the forum. Post some pics, especially of your work in progress.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills/jantzen inductors, Gimpod's boards, Lg Solen SDA inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips, interior of cabinets sealed with Loctite Power Grab, AI-1 interface with 1000VA A-L transformer
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  • westmassguy
    westmassguy Posts: 6,850
    edited November 2013
    Hi, and welcome to the forum. It's doubtful the AU-517 will be able to handle the 2As. The Sansui is 65 watt, and only rated for 8 ohm loads. The 2As are 4 ohm, and drop well below that at certain frequencies. It may work fine at low to possibly moderate levels, but the protection circuit will undoubtedly (and hopefully) shut it down if it goes beyond it's rating.
    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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  • cnh
    cnh Posts: 13,284
    edited November 2013
    Although the 517 is a very robust 65 watt x 2 integrated and has 48K of storage capacitance and two transformers. It is not the best choice for larger SDAs as mentioned above. But, if you have some Monitor 7s or Monitor 10s I bet it would be a wonderful match. I should try that myself since I own a 35/6 lbs AU-517. But I'm waiting to have someone look at its phono pre-amp which has some problems. Otherwise it's a nice sounding piece!

    cnh
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
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  • try1256
    try1256 Posts: 26
    edited November 2013
    Thanks for the comments and insight.
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