Monitor 5b impedance question

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k0syak
k0syak Posts: 5
edited August 2007 in Vintage Speakers
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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  • jakelm
    jakelm Posts: 4,081
    edited August 2007
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    http://polksda.com/pdfs/MonitorReferenceManual.pdf
    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!!!!:eek:
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  • k0syak
    k0syak Posts: 5
    edited August 2007
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    jakelm wrote: »
    http://polksda.com/pdfs/MonitorReferenceManual.pdf

    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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  • engtaz
    engtaz Posts: 7,654
    edited August 2007
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    polksda.com site has a lot of info on older Polks.
    engtaz

    I love how music can brighten up a bad day.
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  • jakelm
    jakelm Posts: 4,081
    edited August 2007
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    k0syak wrote: »
    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!!!!:eek:
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  • k0syak
    k0syak Posts: 5
    edited August 2007
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    jakelm wrote: »
    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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  • heiney9
    heiney9 Posts: 25,092
    edited August 2007
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    k0syak wrote: »
    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 Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • NeilGabriel
    NeilGabriel Posts: 1,487
    edited August 2007
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    From 1988 manual.

    I've run my 5Bs with several different amps/receivers and never had any problem.
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  • k0syak
    k0syak Posts: 5
    edited August 2007
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    heiney9 wrote: »
    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 :)
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  • Ron Temple
    Ron Temple Posts: 3,212
    edited August 2007
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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
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  • k0syak
    k0syak Posts: 5
    edited August 2007
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    Ron Temple wrote: »
    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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  • NeilGabriel
    NeilGabriel Posts: 1,487
    edited August 2007
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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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