Vintage Polk 8 ohm speakers
Cylontymany
Posts: 42
Comments
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Monitor 4, Monitor 5JR+ and Monitor 12 all come to mind when thinking of 8 ohm vintage Polk Monitors.Just a dude doing dude-ly things
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Cylontymany wrote: »Which ones are they? My 7 and 10 are all 6 ohm
How did you arrive at that conclusion?Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Early 7 was nominally 8 ohm; early 10 was nominally 6 ohm, per the Polk brochure (ca. 1976 or 77).
origpolkmonitorspecs by Mark Hardy, on Flickr
I really do need to re-scan this brochure some day...
polk_brochure_back_pg by Mark Hardy, on Flickr -
My LS70's are 8 ohm. I believe the LS50's and LS90's are 8 ohm as well.Decware CSP3 Preamp, RCA 6DJ8, 2 X Rocket 6N1P-EV's, Cary SLA70B Signature V2 Amplifier: 2 X Mullard GZ32's, 2 X RCA/GE 5691's, 4 X Tung-Sol 6550's
Cambridge Audio 640C V2 CD Player & Dacmagic DAC
Rega Planar 3: Deep Groove Subplatter, P3 Motor
upgrade, Dynavector 10x5, JA Michell counterwieght, Cardas tonearm wiring and Mapleshade stand
Parks Audio Budgie Hybrid Phonostage with BEL 6922 tubes, Polk Audio LS70's
H.H. Scott 330D AM/FM Tuner with H.H. Scott 335 Multiplex adaptor. -
Both my 7 and 10 have the peerless tweeters in them. But in my research so far they are both still 6 ohm
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Who cares? Any good amp will drive them regardless of the impedance.
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Indeed. Not sure why the OPs' worried. Nominal impedance is just a number and, as such, doesn't really say much about how easy or difficult of a load any given loudspeaker is.
What can matter is the frequency dependent impedance curve of the loudspeaker. If it dips to, say, 2 or 3 ohms in the neighborhood of, say, 75 to 200 Hz (where there is a lot of "musical energy", i.e., signal being delivered to it when listening to actual music), it might be an issue.
The other thing that can be an issue is what the frequency dependent phase shift plot looks like for any given loudspeaker.
There have been some amplifier killer loudspeakers made and sold over the years. I've never thought of the Polk 7 (nor even the 10) as among that rather unsavory group.
Here's an example of a classically difficult loudspeaker load - the Infinity IRS Beta.
Two sets of impedance curves on this plot (separate woofer and widerange units) -- no phase data, unfortunately.
source: https://www.stereophile.com/content/infinity-irs-beta-loudspeaker-measurements
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Is it true that the series 2 is 8 ohm for the Monitor 7 plus I am not worried about whether its 6 or 8 ohms my 7 are 7Bs which are 6 ohm I believe. I just want to nail down if there is such so I can get a pair.
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FWIW, I totally don't get what your concern is, and I don't know, so I can't help, sorry.Cylontymany wrote: »Is it true that the series 2 is 8 ohm for the Monitor 7 plus I am not worried about whether its 6 or 8 ohms my 7 are 7Bs which are 6 ohm I believe. I just want to nail down if there is such so I can get a pair.
