Polyswitches?

Wade Spradley
Wade Spradley Posts: 81
edited August 2010 in DIY, Mods & Tweaks
Well I am looking into upgrading my crossover in my Polk Monitor 7 Series 2, and I understand they have polyswitches. When I ordered the RDO-198-1 tweeters to replace my SL2500's, I asked about getting some polyswitches from Polk. I was informed they had none available, but they told me they should be rated at 1 Amp 250V, and I should visit another vendor like parts express to purchase them.

Now my main question is, I do not see a 1 Amp polyswitch there. The closest is .75 or 1.1 Amp. As I understand with regular fuses, it is o.k. to underfuse, but not to overfuse. Is this the same case with polyswitches? Should I go with a lower value, I am not even sure what the trip point would be for the different values?

If someone could educate me on this it would be appreciated. I was even contemplating adding a fuse holder and using a fuse instead of a polyswitch.
Post edited by Wade Spradley on
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Comments

  • F1nut
    F1nut Posts: 50,651
    edited August 2010
    If you're not tripping them, remove them and replace with a proper valued resistor. You can find that value by testing the poly you remove.
    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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  • heiney9
    heiney9 Posts: 25,197
    edited August 2010
    Wade Spradley wrote: »

    If someone could educate me on this it would be appreciated. I was even contemplating adding a fuse holder and using a fuse instead of a polyswitch.

    Don't do that, it's more work than it's worth. If you still feel it's necessary to have the Poly (and some do) then measure it and Parts Express used to carry a wide variety.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • Wade Spradley
    Wade Spradley Posts: 81
    edited August 2010
    I guess I will have to give parts express a call and find out their cuttoff ratings for the polyswitches or find another parts vendor that carries a wider variety. Research makes you learn new things. I'll keep the resistor idea from F1nut in mind if I can not find a satisfactory conclusion.
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  • F1nut
    F1nut Posts: 50,651
    edited August 2010
    Wade, have you ever tripped the poly's? If not, you don't need them. However, if you'll sleep better a night, Mouser carries a full line.
    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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  • Face
    Face Posts: 14,340
    edited August 2010
    If you're not tripping the poly, replace it with a jumper(small piece of wire) or .5ohm resistor from Parts Express.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Wade Spradley
    Wade Spradley Posts: 81
    edited August 2010
    I may have inserted my foot in my mouth when I started asking about the Polyswitches I was reviewing the schematics tonight I downloaded from the forum. It looks like the Poly's are not in circuit on the M7s rev.2 schematics (showing the SL2500 tweeter) which I am assuming are the correct diagram for the Monitor 7 Series 2 speakers I have. Since mine has the SL2500 tweeter. The Poly's are shown in the M7 rev with the SL2000 tweeter schematic.

    I guess I will know more once I pull the crossover out and look at it physically.

    I appreciate everyone's input. I apologize for jumping the gun on this one.
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