Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 23 of 23
  1. #1

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default Mystery sealed bookshelf speakers

    Newbie here... first post, sorry if it's in the wrong place.

    I just last week purchased a pair of seemingly small and very cheap Polk Audio speakers. Wow was I surprised when I got them home and they cleaned the clock of my largish floorstanding Lancers. The mystery to me is what exactly I purchased since someone removed the labels from the back of the cabinets. I pulled the drivers from one and the woof = MW7101 while the tweet is a SL4000. Could someone please help me figure out what the specs on these might be (model num, rms power, freq. range... original price)?

    Thanks in advance!

  2. #2

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    Should add that they were made in 1994, are absent of any form of batting and have a tiny crossover mounted to the inside of the spring-clip terminal cup. Sound EXCELLENT!! Bass, detail, amazing imaging... all the best I've heard yet. I am now a Polk Audio fan.

  3. #3

    Member Sales Rating: (0)

    Join Date
    Jun 2009
    Posts
    295

    Default

    Could it be an R series maybe? Those tweeters were mostly in the CS series center channels if I do recall, like the CS200...try looking at speakers from the same period (around the early-mid 90's).
    Home:
    Onkyo TX-6500MKII/Polk LSI 9's (A)Polk TSi 100(B)/Polk PSW 10/Onkyo C-S5VL/Technics SL-QD33
    Home 2 (Playback):
    Dynaudio BM5A MKII/Dynaudio SUB 250MC/Audigy 2 ZS
    College:
    JBL LSR 2325P/JBL 2310SP/MOTU UltraLite MKIII

  4. #4

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    Where would I find this information? Google doesn't have much to offer for "Polk MW7101" "Polk SL4000" or even Polk sealed bookshelf... and it doesn't look like any on the Polk website listing of vintage models.

  5. #5

    Member Sales Rating: (25)

    Join Date
    Feb 2008
    Location
    West Chester, PA
    Posts
    4,301

    Default

    pics?

    Check this site too, http://www.polksda.com/list.shtml
    Click on each clickable link adn see if any of them look like what you have.

  6. #6

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default Quick photo


  7. #7

    Member Sales Rating: (0)

    Join Date
    Apr 2002
    Location
    Levittown, PA
    Posts
    805

    Default

    Not the R series.

  8. #8

    Member Sales Rating: (11)

    Join Date
    Oct 2008
    Location
    Dixon, IL
    Posts
    6,519

    Default

    That looks like a Polk Monitor. One of the semi-rarities, in that it doesn't have a number connotation after the name. It's simply the Polk Monitor.

    I've got a pair of their baby brothers...the Polk Mini Monitors...they're some pretty impressive sounding speakers for their size. Basically the same, but with a 5.25 inch MW in a ported enclosure. Yours have a 6.5" MW's, correct?
    The nirvana inducer-
    APC H10 Power Conditioner
    Denon DVD-2910 universal player
    DPA The Little Bit Three DAC
    Yamaha P-300 turntable/TCC TC-750 phono preamp
    Acurus L10 preamp
    Adcom GFA-545 power amp
    PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Type 4 speaker cables
    Audioquest Sidewinder IC's
    Audioquest Black Mamba IC's
    Signal Cable Analog II IC's

  9. #9

    Member Sales Rating: (8)

    Join Date
    Sep 2006
    Location
    Towson, Maryland
    Posts
    2,561

    Default

    S4? Maybe?
    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D

  10. #10

    Member Sales Rating: (55)

    Join Date
    Jul 2001
    Location
    Exit 5 on the Jersey Turnpike
    Posts
    12,065

    Default

    You decide to part with those JBL Lancer jobs and you can buy a whole bunch of small Polk speakers.

  11. #11

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    I think they're 6.5"... although they are named mw7101.

    Another pic - "Lancer"
    Last edited by daninoregon79; 12-04-2009 at 08:34 AM. Reason: Combine multiple posts

  12. #12

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    delete me please
    Last edited by daninoregon79; 12-04-2009 at 08:36 AM. Reason: please delete this post

  13. #13

    Member Sales Rating: (11)

    Join Date
    Oct 2008
    Location
    Dixon, IL
    Posts
    6,519

    Default

    Quote Originally Posted by MillerLiteScott View Post
    S4? Maybe?

    That was one of my first thoughts too...but the S4's used the SL-5000 tweeter IIRC.

    I'm sticking with Monitor.
    The nirvana inducer-
    APC H10 Power Conditioner
    Denon DVD-2910 universal player
    DPA The Little Bit Three DAC
    Yamaha P-300 turntable/TCC TC-750 phono preamp
    Acurus L10 preamp
    Adcom GFA-545 power amp
    PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Type 4 speaker cables
    Audioquest Sidewinder IC's
    Audioquest Black Mamba IC's
    Signal Cable Analog II IC's

  14. #14

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Youngstown, Ohio
    Posts
    10

    Default

    [QUOTE=daninoregon79;1211025]Should add that they were made in 1994, are absent of any form of batting and have a tiny crossover mounted to the inside of the spring-clip terminal cup. Sound EXCELLENT!! Bass, detail, amazing imaging... all the best I've heard yet. I am now a Polk Au"


    "any form of batting" what do you mean by this?

  15. #15

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    no fiberglass or cotton or any kind of damping material (stuffing) - hollow wooden box. Should I add some?

  16. #16

    Member Sales Rating: (0)

    Join Date
    Jun 2009
    Posts
    295

    Default

    Quote Originally Posted by daninoregon79 View Post
    no fiberglass or cotton or any kind of damping material (stuffing) - hollow wooden box. Should I add some?
    If it sounds fine, you don't need to ( no rattling, etc), dampening is really more for ported designs rather than sealed speakers. Here's a question, does the crossover have any labeling on it?
    Home:
    Onkyo TX-6500MKII/Polk LSI 9's (A)Polk TSi 100(B)/Polk PSW 10/Onkyo C-S5VL/Technics SL-QD33
    Home 2 (Playback):
    Dynaudio BM5A MKII/Dynaudio SUB 250MC/Audigy 2 ZS
    College:
    JBL LSR 2325P/JBL 2310SP/MOTU UltraLite MKIII

  17. #17

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    # RE 0404-1 XOVER

    RESISTOR 5W0.5OhmJ
    small cap, can't see value, 85deg C

  18. #18

    Member Sales Rating: (0)

    Join Date
    Jun 2009
    Posts
    295

    Default

    Quote Originally Posted by daninoregon79 View Post
    # RE 0404-1 XOVER

    RESISTOR 5W0.5OhmJ
    small cap, can't see value, 85deg C
    That seems like awfully few parts for a crossover ( I think so at least) I mean even white wan speakers have a resistor....but the crossover has no other labeling huh...interesting....I still don't know about the model....the tweeter throws me off. I mean here are Polk Mini Monitors, but I don't think they look similar at all....you are sure they're Polk speakers? If anything, I still think they look like R20's (come closest)....but they might be Polk Monitors, I don't know for sure...


    Polk Mini Monitors




    Polk R20

    Polk S4
    Last edited by sk1939; 12-05-2009 at 03:54 AM.
    Home:
    Onkyo TX-6500MKII/Polk LSI 9's (A)Polk TSi 100(B)/Polk PSW 10/Onkyo C-S5VL/Technics SL-QD33
    Home 2 (Playback):
    Dynaudio BM5A MKII/Dynaudio SUB 250MC/Audigy 2 ZS
    College:
    JBL LSR 2325P/JBL 2310SP/MOTU UltraLite MKIII

  19. #19

    Member Sales Rating: (11)

    Join Date
    Oct 2008
    Location
    Dixon, IL
    Posts
    6,519

    Default

    They're definitely not S4's or R20's...not Mini Monitors either.

    They have the SL-4000 tweeters...correct? Do they look like the ones on this speaker?

    edit-I just looked back and saw that you posted a picture already...Yes, those are definitely SL-4000's

    http://www.polkaudio.com/forums/showthread.php?t=76668

    That's a pair of Polk Mini Monitors(that I now own actually). They are the baby brothers to the Polk Monitors...which used the same tweeters, but had a 6.5" MW instead of a 5.25" MW(on the Mini-Monitor).


    edit-

    Here's a copy of the schematic for the Polk Monitors...from the vintage speakers section. Seems to match up with all the info so far. It lists it as having an SL-4000 tweeter, and an MW7001 midwoofer. You said that yours was a 7101...are you sure you got it right? Even if it is a 7101, Polk is infamous for using different drivers in the same speakers at different points in their production runs. I'd guess that's the case here.

    The crossover specs it lists are...

    3.3 uf capacitor
    .5 ohm 5w resistor


    Here's the schematic...

    http://www.polkaudio.com/forums/atta...7&d=1155784925


    So do I win?:p
    Last edited by comfortablycurt; 12-05-2009 at 05:00 AM.
    The nirvana inducer-
    APC H10 Power Conditioner
    Denon DVD-2910 universal player
    DPA The Little Bit Three DAC
    Yamaha P-300 turntable/TCC TC-750 phono preamp
    Acurus L10 preamp
    Adcom GFA-545 power amp
    PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Type 4 speaker cables
    Audioquest Sidewinder IC's
    Audioquest Black Mamba IC's
    Signal Cable Analog II IC's

  20. #20

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    Quote Originally Posted by comfortablycurt View Post
    So do I win?:p
    Yes, you win!

    Give that man a cupie doll!

    These are currently pulling main duty in my living room, with a h/k avr335. Sub duty is handled by a Crown CE1000 pushing a dual 12 car sub I built about 5 years back. Center is an Acoustic Research plastic box that I forgot the name of... no surrounds yet.

  21. #21

    Member Sales Rating: (2)

    Join Date
    Jun 2004
    Location
    New England
    Posts
    8,301

    Default

    Quote Originally Posted by sk1939 View Post
    If it sounds fine, you don't need to ( no rattling, etc), dampening is really more for ported designs rather than sealed speakers. Here's a question, does the crossover have any labeling on it?
    Nope, damping (not dampening, that's getting wet!) is for sealed boxes too :-) It will increase the apparent size of the box to the woofer. An acoustic suspension woofer in a too-small box will be underdamped (i.e., Qtc > 1), with a peak in the midbass, rolling off below. This might sound pleasant, but won't be the "ultimate" performance the driver's capable of. Note that I don't know whether the box in the current case is undersized for the woofer's T/S parameters, but it is a not-uncommon design choice made by (yes) even quite reputable manufacturers.

    Stuffing the box in the present case with some polyester fill has probably about a 50:50 chance of improving/extending the LF performance. It's easy and cheap to try, and 100% reversible if one doesn't like the outcome.
    Last edited by mhardy6647; 12-05-2009 at 01:39 PM.
    all the best,
    mrh

  22. #22

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    10

    Default

    Would you advise stuffing it or just lining the panels with 1 to 1.5" sheets as I would do with a ported box? This has always been a question to me about sealed boxes.

    Thank you everyone for welcoming the clueless newb!

  23. #23

    Member Sales Rating: (2)

    Join Date
    Jun 2004
    Location
    New England
    Posts
    8,301

    Default

    Were they mine (and if I had any diminished satisfaction with them as is) I would pull the woofers, loosely fill the boxes with polyfill, reinstall the woofers (being careful to make sure the gaskets are OK and the box remains reasonably well sealed after the operation) and try 'em out. See if you like what you hear. If not, reverse the procedure.

    :-)
    all the best,
    mrh

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Similar Threads

  1. Mystery Speakers... a curiosity
    By dc55110 in forum Vintage Speakers
    Replies: 4
    Last Post: 10-24-2009, 07:32 PM
  2. Replies: 5
    Last Post: 07-05-2008, 07:07 AM
  3. Mystery Speakers - Are they good?
    By KristinaG in forum Vintage Speakers
    Replies: 10
    Last Post: 07-03-2008, 07:49 AM
  4. Replies: 28
    Last Post: 06-01-2005, 11:40 AM
  5. NHT SB-3's Marvelous sealed bookshelf speaker
    By Zero in forum Flea Market
    Replies: 1
    Last Post: 05-06-2004, 02:32 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts