High End cuts out on SDA 1C's

Drevlin
Drevlin Posts: 23
edited April 2009 in Vintage Speakers
Hi, first post in this forum. Last year I purchased a pair of SDA 1C speakers off ebay, They have the original tweeters in them and came with the crossovers upgraded. They work fine most of the time, when I first got them I used a HK680i receiver to power them and it worked fine until I found a Carver TFM 35x on craigslist which is now used with a new HK receiver.

On either receiver the left speaker has its high end cut out while listening to music at LOW listening levels, and will pop back in when the volume is turned up. I was told by the seller that the Poly-switches were removed (but if they were installed I guess this would be the opposite of what they are supposed to do) I have checked the crossovers out and they look fine, so could this be a tweeter issue? or could there be something else wrong?

Thanks
System:
HK680i
HK AVR 254
Carver TFM-35x
Carver CT 6
Samsung 37" 720p
AAL Speakers (modified, unknown Model)
Polk SDA 1C (Upgraded X-overs)
Polk Monitor 7
Roland DM-20 monitors
Post edited by Drevlin on
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Comments

  • F1nut
    F1nut Posts: 50,746
    edited April 2009
    Are you sure it's just the highs cutting out and not the entire left speaker as the SDA drivers will still play as they are getting a signal from the right speaker. I think your amp has issues in the left channel.
    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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  • Drevlin
    Drevlin Posts: 23
    edited April 2009
    I would find it amazing if the 4 different stereos I have tried have left channel issues, It seems as if it is the high end only(everything sounds muffled out of the left speaker when it cuts out), but it could be about the whole left speaker and the SDA drivers are still playing. Could this be an x-over issue then?
    System:
    HK680i
    HK AVR 254
    Carver TFM-35x
    Carver CT 6
    Samsung 37" 720p
    AAL Speakers (modified, unknown Model)
    Polk SDA 1C (Upgraded X-overs)
    Polk Monitor 7
    Roland DM-20 monitors
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  • ben62670
    ben62670 Posts: 15,969
    edited April 2009
    I would double check to see if the Poly switches were jumped.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited April 2009
    I suggest taking some pictures and posting them here.
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  • nooshinjohn
    nooshinjohn Posts: 25,461
    edited April 2009
    check to see that you have the speakers correctly wired. If you have them out of phase it would showing your amp a direct short. Disconnect the sda cable and try again. If you get decent volume out of them, then I would check the speakers for proper phasing...
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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