Polk Audio model 5 speakers from the mid 1970s

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MJANDGIZMO
MJANDGIZMO
in Vintage Speakers
Is there a wiring schematic for the early model 5 crossovers that have 2 fuses 2 resistors 2.7 and 6.2 Ohm 5watt and 2 capacitors 12uf and 34uf 50vac. I can not find this one in the archives
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Answers

  • tonyp063
    tonyp063
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    This may help. This is the model 7 of the same vintage.
    One can assume the 5's have a slightly larger tweeter attenuation resistor to better mesh with the slightly lower bass output

    hugcle9gwbt9.png
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  • Gardenstater
    Gardenstater
    edited September 5
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    What's the date on the crossover and drivers? Do your Peerless have no small hole in the dome? Are they the earlier ones that may have had the Audax tweeter? I'm not sure if Polk had moved on to the Peerless by the time they introduced the 5.

    Anyways, I screenshot interesting for sale stuff on eBay sometimes and this was a 3-17-83 5A crossover. Looks like the caps were both NP electrolytic at 27uF and 12uF. The resistors are 2.5Ohm and 2.7Ohm, so it looks like the tweeter series resistor was less in the 5A at 2.5 Ohms. I also have a crossover dated 1-21-82 that has a different make of 12uF but everything else is probably the same although I can't read the MW capacitor value.


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    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • F1nut
    F1nut
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    He knows the values. He wants the wiring schematic, which isn't available here.
    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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  • Gardenstater
    Gardenstater
    edited September 5
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    Right. And he knows that it isn't in the archives. It is interesting to see how things changed over the production even though the drivers were the same. The pictures I posted will allow him to compare to his crossovers and, with the schematic tony posted, he can figure out which resistor is in series with the tweeter (the outer one on the board which is probably the 6.2 Ohm) and which is shunting the tweeter (the inner one on the board).
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • F1nut
    F1nut
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    Presuming he has the crossover board since he has the components it's pretty easy to trace the signal path.
    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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  • Gardenstater
    Gardenstater
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    This must be what yours look like? Different PCB layout apparently.

    csu9dzs31or1.jpg
    x7b3ivdpbny2.jpg
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • Gardenstater
    Gardenstater
    edited September 6
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    Remove the 4 screws from the PCB and flip over and do you up a Circuit Board Layout sketch like this one for the Model 11/RTA 11 as a first step towards a schematic sketch. Yours is a much simpler one than this one. Also, I think it is high time we started a thread in the Schematics section where members can put in their own sketches of schematics of the older models where there is no schematic in the archives if that would be agreeable @Ryan_Polk :

    nzkpqjk39128.jpg


    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
    · Share on Facebook