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  1. #1

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    Question Polk Monitor 12 Schematics Question

    Looking at the Polk Monitor 12 schematics, the four mid woofers are wired not sure in series or parallel or both.

    I was thinking two are in series and then each set is parallel like this:
    |--O--O--|
    |--O--O--|

    But the schematic has one more connection in between without any shunt capacitor or anything:
    |--O--|--O--|
    |--O--|--O--|

    So is that the same thing as two in series and then two sets in parallel but vertically ( in the diagram )?


    |--O--|__|--O--|
    |--O--|__|--O--|


    Name:  Polk-schematic_Monitor 12 Monitor12 Schematics.png
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    Last edited by Mystery; 06-21-2013 at 05:41 PM.

    Boston A400, DefTech BP10,BP-2, Klipsch KG2.5,KG4,KSP-400,KSF-C5,RF3,RC3.
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  2. #2

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    hmm..

    not sure. -ve terminals of the upper pair and +ve terminals of lower are at the same potential due to the dead short connecting them. perhaps it has something to do with stabilization?

    anyone understand this design?

  3. #3

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    Looks like two drivers are in parallel first in 2 sets and then those 2 sets are in series.
    Just the reverse of what I thought.
    So if all drivers are 8 ohms, each parallel set will be 4 ohms and when those 2 sets are in series, total is 8 ohms.
    Interesting as all drivers play the same thing without any crossover difference.
    Last edited by Mystery; 06-21-2013 at 10:44 PM.

    Boston A400, DefTech BP10,BP-2, Klipsch KG2.5,KG4,KSP-400,KSF-C5,RF3,RC3.
    JBL L20t,L80t3,L166, EPI 20+,T/E 280, Polk 4,4.5,7C,RTA-11T, KEF Coda III, Yamaha NS-690.
    SUB:PF15TL+, Energy e:XL-S8, Optimus SW-10P, Velodyne VA08BVX10. Pre: HK AP2500. Amps: BB175, Adcom GFA-555II, Rotel RB-990BX.

  4. #4

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    If you compare this schematic to the Monitor 10 schematic (something I'm more familiar with), it looks like 12's will present a higher impedance (to the amp) than the 10's. Where the 10's have (only) the 2 driver's in parallel for ~4 Ohms (even though we know it's a bit higher), the 12's add another pair to raise the impedance closer to ~8 Ohms. In addition, notice the cap in the bass leg of the 12's is about half the value of the one in the 10's. There are some other unusual differences as well, like the putting the poly-switch in parallel with ANOTHER cap; I replaced my PS with a 0.5 Ohm resistor and the high-end (on my 10's) sounds MUCH better.
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