RTA-12C

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BradM
BradM Posts: 6
in Vintage Speakers
I picked up a pair of these speakers yesterday that are in really excellent condition overall, but the tweeters (SL 2000) on both speakers aren't functioning at all. There's no fuse on the crossovers so is there any other obvious reason why both tweeters would quit working? javh9mltuwpm.jpg
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  • Unknown
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  • Gardenstater
    Gardenstater Posts: 4,944
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    It couldn't hurt to check your polyswitches (blue device in red circle), especially since they are so accessible. Try jumpering them and see what happens.

    67wloym0w3ps.jpg


    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • BradM
    BradM Posts: 6
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    Thanks for the quick replies, Pittdogg and George. Working on electronics is well outside of my comfort zone so this gives me something that even I am capable of investigating. Since I'm only in these for $50, I don't mind buying new tweeters. I just would like to get them operating as they should before spending the money on crossover upgrades and other improvements.
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  • Gardenstater
    Gardenstater Posts: 4,944
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    You stole them for $50. Congrats.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • BradM
    BradM Posts: 6
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    Thanks George. I'm sure once fixed that these will prove to be capable replacements for my Sansui SP-3500s.
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  • Gardenstater
    Gardenstater Posts: 4,944
    edited March 2024
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    These would be ideal to take the polyswitch out of the circuit for testing. Get the style with the hooks.

    sscssag3oz22.png
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • BradM
    BradM Posts: 6
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    Gardenstater and Pittdogg, an update on my speakers and the diagnosis. The tweeters were indeed blown and so I purchased the RD0194-1 replacements, which arrived in the mail today. The speakers are joyous to listen to and while I liked my Sansui’s old school style, these Polks just blow them out of the water in sound. It just completely changes sound from my Pioneer SX-939. Thanks both of you for helping me sort out the issue.
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  • BradM
    BradM Posts: 6
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    Now an update to my update. I’ve evidently have already blown my right tweeter again. Since my listening room doubles as my wife’s office and she’s working while I listen to music, it wasn’t because I cranked it up too loud. What do I have going on that would have caused this so quickly?
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  • Gardenstater
    Gardenstater Posts: 4,944
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    Maybe the polyswitch has tripped because it is old and faulty. Try jumping it out like I was suggesting and also do as pitdogg suggested and test the tweeter with an ohmmeter.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • F1nut
    F1nut Posts: 52,406
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    Has your Pioneer SX-939 ever been serviced?
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  • BradM
    BradM Posts: 6
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    Okay, I’m back in business. When it was trying to fit the hat back on there, I must have somehow dislodged the connector from the crossover to the speaker. I had to walk away in frustration a bit but came back to it and sorted it out. Thanks again for your help and suggestions.
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  • boston1450
    boston1450 Posts: 7,759
    edited April 2024
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    @BradM You need something bigger to power them speakers. Be very careful on the volume dial. Hopefully you don't have a bad update to follow
    Randy-Maine
    2ch-RTA15tl crossover upgrade
    by David WMG
    Yamaha cr1000 cr2040
    HT-Yamaha Parasound Acurus
    MIT BJC Cs1000p Polk Rotation
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