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Thread: SDA-1 Crossover

  1. #1

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    Question SDA-1 Crossover

    Greetings. I have the SDA-1's and would like to know if removing the little thermal bypass cap has yielded any positive sonic results. There is nothing wrong with the speakers, however I thought maybe I could start updating the crossovers one step at a time...it seems as though the high end could be a bit brighter and open. Thanks in advance.:D

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    most users remove the polyswitch as it is not needed unless you overdrive the tweeters with an underpowered amp. they also tend to go bad as they age.

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    You would be better off getting all the parts needed over time and then redoing them in totally. If you do one piece at a time you will have to remove and replace them a bunch of times. This could cause more harm than good.

    Plus you will have to go through a break in period for each upgrade your way where they would be only one if you do it all together.

    The polyswitch is good if you do not have enough clean power for the speakers. Like using a reciever in comparison to a seperate pre-amp and amp. So be careful.
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

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    What are you using for power?
    '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 turd by the clean end."

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    Thanks for your replies and the break-in time heads up. Right now I'm listening to the SDA's on a Yamaha C-85/m-85 setup and they are sounding quite nice now that I've discovered my homemade interconnect cables easily become unsnug causing the SDA effect to become a non-effect....I wonder how many amplifier isses are a result of homemade cables. I have the SDA 1's with two vent holes in the upper cabinet compartments. The interconnect cables plug into two pins, positive and negative, with a post. I've got to got to come up with a solution to the squirrelly interconnects before I short my amplifier.

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    Are you sure you have poly's and not fuses on the back? Either way, I would suggest you keep the tweeter protection in place using that amp.

    You should be able to find the proper IC connectors at Mouser or the like.
    '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 turd by the clean end."

  7. #7

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    My bad. No polyswitches on the fused SDA's. I was misled, unintentionally, to believe the 750pf mica was a thermal protection device...After listening to these speakers the past few days, the "newness" factor has worn off and I realized I wasnt happy with the overly warm, laid backand slightly hollow sound of the midrange. So I decided to plug the two vent holes and pack the upper cabinets with more fiberfill. I also lined the walls of the lower cabinet with a 1/4 lb. of fiberfill in each. The results are significant in that the mids and upper bass are much less boomy and hollow and seem more detailed. They are much more listenable at higher volume levels. next I'm going to temporarily bastardize 4 Peerless tweeters, install and evaluate.

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