Monitor 7, 7A, 7B. What are the differences?
odcics2
Posts: 331
So, I have early 7s with the small paper PR. Then 7s with the larger PR. Also 7A and 7B with plasticized PRs.
All have Peerless tweeters.
How would you rank them for sound quality?
What are the internal differences?
Thanks in advance for any insight.
All have Peerless tweeters.
How would you rank them for sound quality?
What are the internal differences?
Thanks in advance for any insight.
Comments
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Not trying to be a smarta$$, but since you might be the only one here with all of those versions perhaps your could share you thoughts on which is best.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 -
A bit of work required on a few!
But yes, I could do listening sessions, but then I would only be telling my opinions. And we all have differing opinions about sound.
Ok, first, get them all usable!
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My 7B sounded better than all those other ones that I haven't heard 👌George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
The Model 7 in this picture predates yours by a bit, since it shows the Audax Tweeter:
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Interesting. I wonder how many production units were made with that tweeter.
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Interesting. I wonder how many production units were made with that tweeter.
Yeah I do not know but was probably 1975 to 1976. It would seem that the earlier models didn't have as low of bass extension as my 7Bs and perhaps the 7A. They consistently gave the figure of 40 - 20ish kHz +/-2 dB. My 7Bs were 33 -20.5kHz +/- 2 dB. Doesn't necessarily mean they didn't sound as good.
Also another thing that may factor in is whether or not the drivers are rabetted. My late 1979 7Bs were not rabbeted at all and later 7Bs had the PR rabbeted and the MW non rabbeted. I assume they were trying to get more bass performance by exposing more of the windows but not sure. Then at some point they also rabbeted the MW which may have been both to get better bass and to lessen diffraction off of the stamped steel driver flange.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Yup, they wanted to flush the drivers to lessen diffraction.
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Gardenstater wrote: »Interesting. I wonder how many production units were made with that tweeter.
Yeah I do not know but was probably 1975 to 1976. It would seem that the earlier models didn't have as low of bass extension as my 7Bs and perhaps the 7A. They consistently gave the figure of 40 - 20ish kHz +/-2 dB. My 7Bs were 33 -20.5kHz +/- 2 dB. Doesn't necessarily mean they didn't sound as good.
Also another thing that may factor in is whether or not the drivers are rabetted. My late 1979 7Bs were not rabbeted at all and later 7Bs had the PR rabbeted and the MW non rabbeted. I assume they were trying to get more bass performance by exposing more of the windows but not sure. Then at some point they also rabbeted the MW which may have been both to get better bass and to lessen diffraction off of the stamped steel driver flange.
What are your serial numbers?
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197XX. Not sequential but 3 apart.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
My 7b's were made in late 1981 and are not rabbeted. Serial #'s 325xx
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My latest find.
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I attached a draft of a document that I had been working on many years ago. It has info on many of the vintage Polk Audio speakers. I can't guarantee it is 100% accurate.Stan
Main 2ch:
Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.
HT:
Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60
Other stuff:
Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601 -
My 7b's were made in late 1981 and are not rabbeted. Serial #'s 325xx
My 7B's were made in early 1983 (571xx) and late 1983 (592xx) and neither are rabbeted either. Both have Peerless tweets.
Edit: I take it back, the passives are rabbeted on both.
Post edited by MrGeology on"One great object of the Constitution was to restrain majorities from oppressing minoritites or encroaching upon their just rights."
-James K. Polk, 11th President of the United States -
Did your late 1983 one come with an SL1000 tweeter?George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Dates of my crossovers.
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Gardenstater wrote: »Did your late 1983 one come with an SL1000 tweeter?
When I got it it had a Peerless. Edit: Crossover simply dated 11/83, MW driver dated 10/25/83.Post edited by MrGeology on"One great object of the Constitution was to restrain majorities from oppressing minoritites or encroaching upon their just rights."
-James K. Polk, 11th President of the United States
