SRS 2 with no SDA Effect

bored184
bored184 Posts: 324
edited October 2013 in Vintage Speakers
The other day I was listening to my SRS-2 blade/blade hooked up to a Dynaco ST-70 and the SDA effect was off. I ran the balance to the left and the right SDA Drivers were working, when I ran the balance to the right the left SDA drivers/tweeter were not working. I popped the passive out and wiggled everything I could checking for loose connections with no luck. Pulled the drivers and checked them with a ohm meter and they check within spec. I still think it's a loose connection somewhere, any ideas where to start?
Speakers: TL Monitor 10s, RTA 11TLs, Fortes, Thiel CS 1.2
Amplifiers: ]Ashly FTX 2001 III, Dynaco ST-70, DIY F6
Pre: Adcom GFP 750, Aikido Tube Pre
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  • F1nut
    F1nut Posts: 50,557
    edited October 2013
    Check the SDA cable and the sockets.
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  • bored184
    bored184 Posts: 324
    edited October 2013
    F1nut wrote: »
    Check the SDA cable and the sockets.

    Checked the cable and the socket in the "bad" speakers. Both tested fine using my VOM. I set my meter to the short setting so it would beep if a current was able to pass through and I got a beep on everything I tried.
    Speakers: TL Monitor 10s, RTA 11TLs, Fortes, Thiel CS 1.2
    Amplifiers: ]Ashly FTX 2001 III, Dynaco ST-70, DIY F6
    Pre: Adcom GFP 750, Aikido Tube Pre
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  • gimpod
    gimpod Posts: 1,793
    edited October 2013
    Check the other IC socket also and if that isn't it pull the crossovers from both speakers and check for bad or lose solder joints, Don't forget to label all connections before pulling the crossovers.
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • bored184
    bored184 Posts: 324
    edited October 2013
    Would a loose connection in the the right speaker cause the SDA drivers and tweeter not to work in the left speaker? I hope to get into the right speaker tomorrow after I mow.
    Speakers: TL Monitor 10s, RTA 11TLs, Fortes, Thiel CS 1.2
    Amplifiers: ]Ashly FTX 2001 III, Dynaco ST-70, DIY F6
    Pre: Adcom GFP 750, Aikido Tube Pre
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  • Schurkey
    Schurkey Posts: 2,101
    edited October 2013
    Each of those blade/blade speaker cabinets sends a full-range, full-voltage signal to the opposite cabinet. Thus the reason for BOTH of the conductors in the blade/blade interconnect cable being used. Yes, if one speaker cabinet has faulty wiring, the other cabinet might not get the SDA signal, and the SDA effect will be missing.
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  • bigaltx24
    bigaltx24 Posts: 141
    edited October 2013
    Also check that the wires from the amp are in phase. I got my 1Bs out of phase one time, no SDA. I did all the continuity tests etc, found nothing. Finally checked the wires from the amp, one side was wired out of phase.
    Denon PMA-900V
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  • zingo
    zingo Posts: 11,258
    edited October 2013
    I had a pinched wire in my SDA cable between the cabinet and the inductor cup when I rewired mine, and that was enough to throw off the SDA signal. I had to go top to bottom and check every connector, solder joint, etc.
    Jake
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  • Phasewolf
    Phasewolf Posts: 514
    edited October 2013
    I would say there is a crossover issue. If it was a cable then it would stop it from working both ways not just one. Take the crossover out and take a good look at the molex connectors and also make sure all the solder is good and not ringed out.
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  • Schurkey
    Schurkey Posts: 2,101
    edited October 2013
    Phasewolf wrote: »
    I would say there is a crossover issue. If it was a cable then it would stop it from working both ways not just one.
    No. With blade/blade SDAs, one conductor or one connection of the two on each end of the SDA cable or sockets could be bad, destroying the SDA effect on one cabinet, and having absolutely no effect on the other.
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