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  1. #1

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    Default Monitor 10b SDA conversion?

    I was looking at the wiring diagram for the monitor 10s with anticipation of doing the xover upgrades. I decided to look at the SDA CRS+ 1986 Sch.pdf. To my untrained eye it seems like there is not a huge difference between the wiring for the monitor 10 and the SDA CRS+.

    Has anyone tried to modify a pair if monitor 10s give them perform like SDAs? Are the xovers similar enough that they would work as SDAs by just replacing and adding some new components and doing some rewiring? Seems like it would be an interesting and worthwhile modification.
    SDA 2BTL Sonicaps Mills resistors RDO-198s New gaskets H-nuts Erse inductors Crossover upgrades by westmassguy
    Adcom GTP-450 preamp
    Adcom GFA-555 amp Upgrades & speaker protection added by OldmanSRS
    Pioneer DV-610AV DVD/CD player
    SDA CRS+ Hidden away in the closet

  2. #2
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    Not only are the crossovers different as you would guess, but the drivers are probably different as well.

    The Monitor 10b is a unique Polk speaker that is fairly popular and not as common as the 7 or 5, so my guess is that you could sell your 10b and by a proper SDA 2A for about the same money; but I know that's not as much fun.

  3. #3

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    10B's are just as popular (probably even moreso) as the 7's and 5's. If anything the 7's were probably the least popular in their day. But again, probably splitting hairs. With the 5B's being the most popular.

    And no you can't modify the 10B to make it an SDA. For one, the driver spacing is all wrong.......for two, see number one as nothing else matters if the spacing is not correct.

    H9
    Last edited by heiney9; 03-14-2011 at 01:36 PM.
    "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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  4. #4

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    Thanks
    Last edited by TennMan; 03-14-2011 at 01:44 PM.
    SDA 2BTL Sonicaps Mills resistors RDO-198s New gaskets H-nuts Erse inductors Crossover upgrades by westmassguy
    Adcom GTP-450 preamp
    Adcom GFA-555 amp Upgrades & speaker protection added by OldmanSRS
    Pioneer DV-610AV DVD/CD player
    SDA CRS+ Hidden away in the closet

  5. #5

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    Quote Originally Posted by TennMan View Post
    Now that we know the hierarchy of the popularity of the different vintage monitor speakers. Could someone please comment on the differences between the monitor 10 crossovers and the SDA CRS+ and the possibilities of modifying them to make SDAs out of a pair of monitor 10s? Seems like a legitimate question for someone to ask who likes the monitor 10s and likes the idea of having them sound like SDAs.
    See my edit in post #3..........the driver spacing is not correct so it's moot.

    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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  6. #6

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    Quote Originally Posted by TennMan View Post
    Thanks
    No problem.

    Driver spacing is a very critical part of SDA's. If it is off, the SDA portion is greatly reduced. In the end all the work involved with sourcing x-overs, etc wouldn't give you the best result. Would it work? Probably to some degree but the effort involved wouldn't be worth it.

    If you want CRS's look for a used pair.

    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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  7. #7

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    Thanks again. That makes sense.
    SDA 2BTL Sonicaps Mills resistors RDO-198s New gaskets H-nuts Erse inductors Crossover upgrades by westmassguy
    Adcom GTP-450 preamp
    Adcom GFA-555 amp Upgrades & speaker protection added by OldmanSRS
    Pioneer DV-610AV DVD/CD player
    SDA CRS+ Hidden away in the closet

  8. #8

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    Tennman, if this were a mod we could perform I am sure we would have a sticky for it by now, and a build thread or thirty.
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

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