Refurbishing 7C

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  • YOG
    YOG Posts: 2
    edited February 13
    Adding to an older 7C topic as I have a pair of 7C's with external fuses and the crossovers were refurbished today.

    I bought them from the original owners. Nothing looked modified. 6.5" Drivers (dated 1-25-1984 & 1-31-1984) and crossovers were (dated 1-30-1984).

    Today, I updated crossovers. Original Caps were 34uf and 12uf & resistor was 2.7ohm.
    The original 34uf cap measured 41uf. The 12uf was still 12uf and the resistor measured 2.9ohm. All were replaced.

    I used MECCANIXITY caps and ceramic/cement resistors from Amazon. The caps measured spot on. The resistors measured 2.8ohm. I've used these caps in the past and they worked well.

    Before the crossover update, they didn't sound quite like thought they should. Not quite sure how to best describe it but they sounded thin and lifeless compared to other vintage Polk's in my collection, After the crossover refresh they immediately sounded better. Really better in this case. My gripes about them are gone.

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    Post edited by YOG on
    Current members of the ever changing, too many speaker collection:
    Polk Audio - SDA CRS, Monitor 7C, Monitor 5, Monitor 5JR, ES20/ES30, RT55i, CS400i, FX500i, RT25i, RT15i, RT1000P, 8TL, TL1, TL2 and TL3's
    Infinity - CS3006, Reference Four, Column II, R162
    DQ-10's, GoldenEar Triton 7, Klipsch KLF-20
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  • xschop
    xschop Posts: 5,232
    wbrokow1 wrote: »
    Yes they are. I purchased them from The listening Room in scarsdale NY brand new in box. ~7 hundred dollars. I personally opened the factory sealed polk audio box myself.

    The vintage melting pot never ends.
    Don't take experimental gene therapies from known eugenicists.
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