Help Identify Midwoofs Monitor 7

HB27
HB27 Posts: 1,518
edited August 2008 in Vintage Speakers
Two part question here.

I need help in identifying my midwoofer series. No model # I can find.
Second, I thought one of these was bad because it was distorting under a little more than average volume power. I pulled these out and they feel fine. No noticable rubbing. Will the polyswitches and caps on the crossovers cause these to distort to such noticable levels? Thank you.
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  • jon s
    jon s Posts: 905
    edited August 2008
    looks like a 6502... you are describing the exact same issue i am having with my Polk Model 10Bs... one of the two mid-woofers distorts readily when driven moderately loud but the other seems fine. It only distorts when being driven by my 150wpc receiver. seems fine when driven by lesser powered amps... how much power are driving the speakers with?
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  • HB27
    HB27 Posts: 1,518
    edited August 2008
    I drive them with a 25wpc EL86 Lafayette integrated with Mullards throughout. Tubes and amp are 100% AOK.
    I just switched the midwoofs to the other cabinets and the midwoof I thought was bad is working fine in the other cabinet. The one I thought was good is acting up in the opposite cabinet.
    Definitely a crossover problem. Crap! I stripped out a good pair of speakers because of a couple bucks worth of caps and polyswitches.
    Thanks, hb1
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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    Its an early one with the MW6500
    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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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    Time for new caps, and do the resistors while you are at it.
    Bne
    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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  • heiney9
    heiney9 Posts: 25,204
    edited August 2008
    Yep,

    MW6500 look under the Polk Audio logo on the label. You can see it says "MW6500". Not sure if Polk makes a direct replacement. Best to call CS and see what they suggest.

    GL

    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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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    heiney9 wrote: »
    Yep,

    MW6500 look under the Polk Audio logo on the label. You can see it says "MW6500". Not sure if Polk makes a direct replacement. Best to call CS and see what they suggest.

    GL

    H9

    You can read too :p
    I have old 6500's that would match well. I think Polk is shipping 6503's as the closest replacement.
    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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  • jon s
    jon s Posts: 905
    edited August 2008
    ben62670 wrote: »
    Time for new caps, and do the resistors while you are at it.
    Bne

    I noticed my problem AFTER I upgraded to the Sonicaps and Mills resistors...

    :confused:
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  • HB27
    HB27 Posts: 1,518
    edited August 2008
    Thank you for the info.

    My problem followed the cabinet. Problem is in the crossover apparently. After switching woofs from cabinet to cabinet the same issue stayed in the same cabinet.

    hb
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  • jon s
    jon s Posts: 905
    edited August 2008
    I guess when i am done refinishing the cabinets I will need to do some thorough testing to determine the extent of the problem...
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