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  1. #1

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    Default Monitor 5b impedance question

    Hi!
    I've recently become a (proud :)) owner of a pair of Monitor 5b's (SL2000 tweeters version). I've seen their impedance listed in different places either as 8ohm or 4ohm.
    Does anyone know what the real impedance is? Measurements would be more than welcome :)

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    Monitor 7b's front
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    Dayton 12" DVC w/ Rythmik 350a plate amp
    Harman/Kardon AVR-635
    Oppo 981hd
    Denon upconvert DVD player
    Jennings Research (vintage and rare)
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    Dont BAN me Bro!!!!

  3. #3

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    Thanks!
    Does this one (taken from the site) relate to the later model?
    ============
    Overall Frequency Response 30Hz - 25kHz
    Lower -3dB Limit 43Hz
    Upper -3dB Limit 23kHz
    Nominal Impedance 8 ohms
    Recommended Amplifier Power 20-125 w/channel
    Efficiency 90 dB
    =========================

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    polksda.com site has a lot of info on older Polks.

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    Quote Originally Posted by k0syak View Post
    Thanks!
    Does this one (taken from the site) relate to the later model?
    ============
    Overall Frequency Response 30Hz - 25kHz
    Lower -3dB Limit 43Hz
    Upper -3dB Limit 23kHz
    Nominal Impedance 8 ohms
    Recommended Amplifier Power 20-125 w/channel
    Efficiency 90 dB
    =========================
    You said 5b's right? With sl2000 tweeter? Then thats it.....
    Monitor 7b's front
    Monitor 4's surround
    Frankinpolk Center (2 mw6503's with peerless tweeter)
    M10's back surround
    Hafler-200 driving patio Daytons
    Tempest-X 15" DIY sub w/ Rythmik 350A plate amp
    Dayton 12" DVC w/ Rythmik 350a plate amp
    Harman/Kardon AVR-635
    Oppo 981hd
    Denon upconvert DVD player
    Jennings Research (vintage and rare)
    Mit RPTV WS-55513
    Tosh HD-XA1
    B&K AV5000


    Dont BAN me Bro!!!!

  6. #6

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    Quote Originally Posted by jakelm View Post
    You said 5b's right? With sl2000 tweeter? Then thats it.....

    I'm totally confused now :)
    What I've quoted is from this page http://www.polkaudio.com/homeaudio/specs/monitor5/
    It seems to be about the newer (SL2500) version,no?

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    Quote Originally Posted by k0syak View Post
    I'm totally confused now :)
    What I've quoted is from this page http://www.polkaudio.com/homeaudio/specs/monitor5/
    It seems to be about the newer (SL2500) version,no?
    Yes, that is correct the Monitor's on the Polk Audio site are Series II and they have the newer sl2500 tweeter.

    As Engtaz suggested go to www.polksda.com as he has scans of original owners manuals and literature for the original series of monitors, etc.

    H9

    From memory the early model 5's were 4 ohm nominal and the later model 5's (not Series II) were 6 ohm nominal.

    Why do you ask? Any series monitor 5 is very easy to drive and presents no problem for any receiver.
    "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!

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    From 1988 manual.

    I've run my 5Bs with several different amps/receivers and never had any problem.
    Attached Images  
    Last edited by NeilGabriel; 08-22-2007 at 02:41 PM.

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    Quote Originally Posted by heiney9 View Post
    From memory the early model 5's were 4 ohm nominal and the later model 5's (not Series II) were 6 ohm nominal.

    Why do you ask? Any series monitor 5 is very easy to drive and presents no problem for any receiver.
    I was just wondering why all the different specs and which model exactly do I have. It says 5 92597 on the back, is it possible to figure something out of this? And yes, they don't make it hard on the amp :)

  10. #10

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    Pull out the tweeter or a the driver...there should be a date stamp on it...might be build date or when it entered inventory, but it will close to when the speaker was originally manufactured.

    Combo rig:

    Onkyo NR1007 pre-pro, Carver TFM 45(fronts), Carver TFM 35 (surrounds)
    SDA 1C, CS400i, SDA 2B
    PB13Ultra RO
    BW Silvers
    Oppo BDP-83SE

  11. #11

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    Quote Originally Posted by Ron Temple View Post
    Pull out the tweeter or a the driver...there should be a date stamp on it...might be build date or when it entered inventory, but it will close to when the speaker was originally manufactured.
    Thanks, gotta try it.
    Also, does anyone know if they are magnetically shielded? (i.e. is it safe to place them very close to the computer and the display?)

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    They are not magnetically shielded. This is vintage (pronounced, vin-taaahj).
    The cabinets are quite dense, but I had a pair of 10Bs near my rear projection LCD and definitely got some interference on the edges. I was worried about pulling a mid out, but they come out easily, though you need to be careful not to let it slip and snap a connection as they are heavy.

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