SDA-1C tweeter protection circuit

00p225
00p225 Posts: 100
edited August 2004 in Troubleshooting
The protection circuit on the left channel of my SDA-1C's shuts down the tweeters at medium volume levels. I swapped the tweeters from the right to the left channel just encase one on the left side was bad and still had the same issue. I also tried a different amplifier to eliminate that possibility and it still shut down at moderate volume levels. Please not the amplifier was no where near clipping at these volume levels.

I looked at the crossover and located what looks like a thermal resistor in the circuit that must be going bad. Does anyone know if these are still available from Polk? I checked their service and parts page and don't see anything listed except the complete crossover. Thanks for any help.

Zane
Main System
Pre - Homebrew 12au7 tube preamp
Amp - Eico HF-87 with EHEL34's
Source - Modded Toshiba 3950
Interconnects - DIY Belden
Speakers - Polk SDA-1C

Basement System
Pre - McIntosh C-28
Amp - McIntosh MC2100
Source - Modded Toshiba 3960
Tape - Pioneer RT-707
Turntable - Thorens TD150MKII with Denon DL-160
Speakers - Pioneer HPM-100
Post edited by 00p225 on
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Comments

  • dorokusai
    dorokusai Posts: 25,577
    edited August 2004
    kswauger@polkaudio.com

    He will get you set-up. That is a common failure, and the part is easily replaced if you can solder. If you are not comfortable with soldering, let me know, and I will get you squared away.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • 00p225
    00p225 Posts: 100
    edited August 2004
    I'll go ahead and shoot him an email. Thanks again.

    Zane
    Main System
    Pre - Homebrew 12au7 tube preamp
    Amp - Eico HF-87 with EHEL34's
    Source - Modded Toshiba 3950
    Interconnects - DIY Belden
    Speakers - Polk SDA-1C

    Basement System
    Pre - McIntosh C-28
    Amp - McIntosh MC2100
    Source - Modded Toshiba 3960
    Tape - Pioneer RT-707
    Turntable - Thorens TD150MKII with Denon DL-160
    Speakers - Pioneer HPM-100
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  • 00p225
    00p225 Posts: 100
    edited August 2004
    Ken is sending me the thermal resistors. Sure can't beat that kind of customer service, especially for a 15 year old product! Thanks to Ken and Polk Audio!

    Zane
    Main System
    Pre - Homebrew 12au7 tube preamp
    Amp - Eico HF-87 with EHEL34's
    Source - Modded Toshiba 3950
    Interconnects - DIY Belden
    Speakers - Polk SDA-1C

    Basement System
    Pre - McIntosh C-28
    Amp - McIntosh MC2100
    Source - Modded Toshiba 3960
    Tape - Pioneer RT-707
    Turntable - Thorens TD150MKII with Denon DL-160
    Speakers - Pioneer HPM-100
    · Share on FacebookShare on Twitter