monitor 7 change

Mike53
Mike53 Posts: 21
edited February 2011 in DIY, Mods & Tweaks
Good morning everyone,

I have a pair of monitor 7s both with damaged woofers. My question, is it possible or even desirable to install an active woofer in these speakers. I realize that the crossover will require changing. Is there an active bass driver that is compatible with the SL2500 tweeter and MW6502 mid?

Any info is appreciated. Thanks.

Mike
Post edited by Mike53 on
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Comments

  • TNHNDYMAN
    TNHNDYMAN Posts: 2,145
    edited February 2011
    Mike-
    I'm not sure I understand your ? correctly... if you are referring to the bottom 10" woofer you could pull it and see that no wire go to it since it is a passive subwoofer. I don't understand the science of how it works or helps increase low freq response but I know they are very effective in my Monitor 10's and 7's. If you are speaking about the 6 1/2 mid and it is damaged I would recommend a direct replacement. If you really do want to add an active 10" woofer to the mix well I'm sure it can be done but not w/o changing the crossover obviously and then it would be a shame to ruin a vintage wonderful Polk speaker.
    2-ch System: Parasound P/LD 2000 pre, Parasound HCA-1000 amp, Parasound T/DQ Tuner, Phase Technology PC-100 Tower speakers, Technics SL-1600 Turntable, Denon 2910 SACD/CD player, Peachtree DAC iT and X1asynchorus USB converter, HSU VTF-3 subwoofer.

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  • geoff727
    geoff727 Posts: 546
    edited February 2011
    Those 10" passive radiators are usually plentiful on ebay. I have stocked quite a few of them. Monitor 7's (not incl. Monitor 7 Series 2) use part number SW101.

    To install an active woofer would, as you say, require a crossover change. But would also necessitate using the mid-bass driver as a midrange-only driver. Then, you'd have to separate it from the woofer by building an internal enclosure to isolate it from the woofer's back wave. Otherwise, you "midrange" would become a partial passive radiator for your new active woofer. Now you have the issue of appropriate enclosure sizes for the midrange, and finding a woofer that will work and balance properly with the midrange and tweeter given the overall modified enlosure size. Etc., etc., etc. Can of ugly worms.....

    G~
    Polk SDA SRS 2
    Polk RTA 15tl
    Polk Monitor 7C
    Polk Lsi9
    Infinity RS-II (modded)
    Infinity RS-IIIa (modded)
    Infinity RS 2.5 x 2
    Magnepan 1.6QR (modded)

    System: http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1290711373
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