Monitor 7 opened up to find a surprise

ratpin
ratpin Posts: 73
in Vintage Speakers
I’m currently gluing a bunch of my mid drivers magnets.

I’ve had these M7’s for a few years and thought I tested them when I got them but can’t remember for sure. Anyway I opened one up to find something unusual inside. See picture. Any thoughts?

pipi5o0fmpxm.jpeg

3s4n7nc2bhzj.jpeg



Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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Comments

  • msg
    msg Posts: 8,449
    Huh?
    No crossover?
    I disabled signatures.
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  • xschop
    xschop Posts: 4,068
    5Jr crossover
    Don't take experimental gene therapies from known eugenicists.
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  • ratpin
    ratpin Posts: 73
    Anyone have a spare M7B crossover?
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • ratpin
    ratpin Posts: 73
    m9cnse9j73lv.jpeg
    imsi0g6a5e9e.jpeg
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • ratpin
    ratpin Posts: 73
    Here’s a picture of the crossover in the other cabinet. This is the one I guess I need.

    irkn3x2p2ezl.jpeg
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • xschop
    xschop Posts: 4,068
    Im REALLY curious if the 5Jr crossover has the 34uf, 12uf caps and 2 ohm resistor grafted in?
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 16,046
    edited August 15
    I would like to see the other side of that crossover.
    Post edited by Toolfan66 on
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  • ratpin
    ratpin Posts: 73
    Toolfan66 wrote: »
    I would like to see the other side of that cross over.
    .

    Seems like this is as much as I can get without de-soldering.

    0uuknv9j8863.jpeg
    bt38k9pj7kwx.jpeg


    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • Toolfan66
    Toolfan66 Posts: 16,046
    edited August 15
    Ratpin,

    I will be upgrading my 7’s soon, and I plan on doing a point to point crossover, I am waiting on some inductors from HiFi Collective, if it looks like all will go as planned I will gift you a crossover, if you don’t find one between now and then.
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  • Gardenstater
    Gardenstater Posts: 3,866
    Yes we need a view of the binding post side and underneath that PCB on the components side. The very early 7s had part of the crossover on the back of the tweeter, not that I'm saying that is what this is.

    You have Monitor 7Cs.
    George / NJ

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  • ratpin
    ratpin Posts: 73
    Toolfan66 wrote: »
    Ratpin,

    I will be upgrading my 7’s soon, and I plan on doing a point to point crossover, I am waiting on some inductors from HiFi Collective, if it looks like all will go as planned I will gift you a crossover, if you don’t find one between now and then. It is a perfect match to what you have..

    That would be great! And no I’m not in a hurry. Thank you!

    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • Toolfan66
    Toolfan66 Posts: 16,046
    08osl0otny8g.jpeg
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  • ratpin
    ratpin Posts: 73
    edited August 15
    Yep that’s exactly what’s in the other cabinet.
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • ChrisD06
    ChrisD06 Posts: 615
    edited August 15
    ratpin wrote: »
    Toolfan66 wrote: »
    I would like to see the other side of that cross over.
    .

    Seems like this is as much as I can get without de-soldering.

    0uuknv9j8863.jpeg
    bt38k9pj7kwx.jpeg


    That's indeed a 5JR/+ Series 1 crossover.

    h1z4o3c8vxza.jpg
    d62q4us283rm.jpg

    It doesn't appear to have any components from the M7 grafted on like Rob asked.

    Also you can get it further than that without desoldering. The resistance is just slack copper wire from the large inductor being very stiff. You can lift it straight up and it'll come out alot further.

    M5JR board is a PITA to rebuild. Anyhow, it looks like you'll be needing to find the correct crossover or make this one spec-compatible.
    • Fronts - RT3000p
    • Center - CS1000p
    • Sides - RT35
    • Rears - RT35
    • AVR - Onkyo TX-NR656
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  • ratpin
    ratpin Posts: 73
    Thank you!
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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