Yet another Monitor 7 version question!! :-)

Hey all, New to the forums here but VERY excited for what I will be picking up Thursday!! Found a MINT set of Monitor 7 speakers on a local sale site!! I have been SCOURING the forums and there's TONS of info here on these speakers!! I want to rebuild the crossovers, glue the magnets and Dynamat the baskets. But first......I need to know which version these are. Tonyp063 has been a HUGE help and I can't thank him enough!! He said these appear to be 7B but these don't have the fuse holder on the input cup. I feel confident that he's correct but before I start buying parts for the crossovers I would like to know for sure. When I get my hands on them I will open them up and post pics of the crossovers so I can ask which replacement parts to purchase.

Thanks so much in advance for all the replies!! VERY excited to get these speakers!!

PS. Got the speakers, stands and original owners manual for 115 bucks!! :-)

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Comments

  • la2vegasla2vegas Posts: 4,279
    Those look like 7B's to me.
  • GardenstaterGardenstater Posts: 1,072
    edited March 17
    I'd guess 7c. My 7B's have the Peerless Tweeter, full cabinet sized grilles and differently styled attachment pegs for grilles, no beveled edge on cabinet, drivers are not recessed into the baffle, and serial # is on the crossover cup. Also, I have a fuse for the tweeter circuit. I'll bet that yours have the polyswitch in the crossover since there is no fuse.

    Congratulations, what a buy!!!
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • JayMXJayMX Posts: 313
    edited March 17
    You got 7C's like me! Those look like they’re in perfect condition! My $20 pair was pretty nasty when I picked them up. Give em the full battery of love and they will reward you in kind.

    Here’s my upgrade thread:
    https://forum.polkaudio.com/discussion/177885/monitor-7-refresh

    Since then I’ve added hurricane nuts and replaced the gaskets. Great stuff. Enjoy yours!
    Current Collection:
    Monitor 4a (Peerless), Monitor 4b (Peerless), Monitor 5a (Peerless), Monitor 7b (Peerless), Modified Monitor 7c’s (194’s), SDA CRS+ (SL2000), RTA12c (194's), SDA SRS 2 (SL2000)

    Repair pile: SRS 3.1TL (198’s), SDA CRS, (1) lonely RTA 11TL to become a center channel... someday...

    Pairs that have passed through:
    Monitor 5b (SL1000), Monitor 5b (SL2000), Monitor 10a (Peerless), Monitor 10c (3x pair), RTA8, RTA8TL, RTA 11T, SDA 2, SDA 2a, SDA 2b, SDA 1b, SDA 1c, SDA SRS 2

    ...and more to come, it’s a sickness.
  • teekay0007teekay0007 Posts: 2,237
    7Cs with SL-2000 tweeters.

    Very nice pick up! You’ll get lots of enjoyment out of them. B)
  • F1nutF1nut Posts: 44,826
    7C's
    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

  • westmassguywestmassguy Posts: 6,672
    edited March 18
    Pull the crossover, and read the values right off the caps and resistors. Always best to double check what's there versus the schematics.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
    Cables: Speaker: Furez 10/2 with GLS Locking Banana Plugs
    Interconnect: Furez 10/2 with SpeakONs
    ICs: Custom Furez by Douglas Connections
    Den:
    Bose 901 Series II Continentals Restored, Re-Built Equalizer with Elna Silmic IIs, Sonicaps, and Silver Mica Caps
    Carver CT-3 Pre, Carver C-500

    dhsspeakerservice.com/
    Exclusive Distributor of Gimpod's Custom SDA Circuit Boards

    "And keep her under 70, would you, huh? Betty likes a slow ride"
  • dromundsdromunds Posts: 8,865
    Upgrade those tweeters
  • Rick_HayesRick_Hayes Posts: 24
    Hey all....picked up my Monitor 7Cs yesterday and they are even better than the pics made them look!! I'm SO happy with my purchase!! I told the guy I didn't need the included stands so he knocked another 20 bucks off so I got them for 95 bucks!! I'm super STOKED!! :-) The original owners manual was the icing on the cake!!


    Couple questions......the crossovers look to be in EXCELLENT condition and they sound really good!! Do I even need to upgrade the components or should I leave them alone and enjoy?


    Also....any ideas as to what the white milky/chalky looking stuff is on the woofer center caps? this is on both woofers.

    Thanks for the replies!!

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  • F1nutF1nut Posts: 44,826
    edited March 21
    You should have bought the stands especially if they were original.

    The white stuff is from the adhesive used to secure the dust cover. You may be able to remove some or all with original Windex applied to a soft cloth and gently rubbed onto the affected area.

    Yes, you need to upgrade the crossovers. The caps are 30+ years old, so way past their due date and the block resistors flat out suck.

    Edit: the little mustard yellow device is a polyswitch. Remove it and replace with a 0.5 ohm resistor while you're upgrading the rest.
    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

  • Rick_HayesRick_Hayes Posts: 24
    Thanks for the reply F1!! The stands weren't original......I don't think. I know this is a lot to ask but.....do you happen to have a parts list for what I would need to do a full XO rebuild? I can do the soldering work I just want to make sure I get the correct components! Thanks!!
  • F1nutF1nut Posts: 44,826
    Ok, I looked at your earlier pics, not original stands, but you'll need to put the speakers on stands, so maybe go back and get them. You won't find proper stands for $20.00.

    Caps
    12uF Sonicap Gen I
    34uF Sonicap Gen I

    Resistors
    0.5 ohm 10 or 12 watt Vishay/Mills
    2 ohm 10 or 12 watt Vishay/Mills

    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

  • Rick_HayesRick_Hayes Posts: 24
    F1.....Thank you very much!! I'll get parts on the way!!
  • Rick_HayesRick_Hayes Posts: 24
    F1....WOW!! 215 bucks to rebuild my 95 dollar speaker XOs!! LOL!! I'll have to mull this one over a bit!! 🤑😳😂 Is there anywhere but Sonic Craft to purchase these?

    Thanks again for your help!!
  • F1nutF1nut Posts: 44,826
    edited March 21
    Of course there are cheaper caps, but they don't sound good. Don't forget to replace those nasty SL2000 tweeters with the RD0194. For well under $500.00 you'll have a pair of speakers that will easily outperform much more expensive ones.

    Get the stands!!!
    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

  • teekay0007teekay0007 Posts: 2,237
    Jesse’s right, get the crossovers redone with quality parts. These speakers will be making you happy for 30 more years. Do the tweets too and by all means, get those stands! They give the proper height and angle to your speakers.
  • GardenstaterGardenstater Posts: 1,072
    I'm guessing you will *like* the way these speakers sound as is, but just wait until you do the upgrades! You will not be disappointed. You pretty much stole em for the price you paid, so you have more money for the upgrades that will make them really shine. No hurry though.

    Yes, I would get those stands as well, which are also a downright steal for $20. You definitely don't want to put them on the floor.
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • Rick_HayesRick_Hayes Posts: 24
    OK.....I'm convinced....I'll start with pulling the 6.5 drivers and gluing the magnets and order the XO parts and do those. A bit later I will swap out the tweeters. I will admit the current tweets have a really weird "hollow" sound to them. And I totally understand the stands......sweet spot is magical!! 😊🤘
    BTW....where is a good source for the new tweeters? Does Polk still sell them or is that an ebay thing?
    Thanks again for all the helpful replies!! I absolutely LOVE forums like this versus the ones that are dead!! Post a comment.....crickets!! 😂
  • pitdogg2pitdogg2 Posts: 16,774
    Polk did have them or they can point you to who is carrying them. Give Polk customer service a call and mention you belong to the polk forum you will get a small discount and free shipping. If they point you somewhere else the cost will be 60.00 each and you pay shipping.
    New tweeters number is RD-0194.
    Welcome aboard.
  • GardenstaterGardenstater Posts: 1,072
    edited March 21
    fwiw it looks like they are on sale for $55 at midwestspeakerrepair.com

    https://www.midwestspeakerrepair.com/shop/home-audio/tweeters/polk-audio-1-tweeters/polk-audio-sl2000-1-inch-dome-tweeter/

    Check those MW's carefully to make sure the voice coils aren't binding at all when you manually exercise the cones. Otherwise, no point in gluing the magnets until they're fixed or replaced.
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • pitdogg2pitdogg2 Posts: 16,774
    48.00 at Polk if they have them.
  • Rick_HayesRick_Hayes Posts: 24
    Well......just got off the phone with Polk. Even after telling the guy I was forum member the price for RD0194 tweeters was 60 bucks each. I'll look elsewhere. ☹
  • pitdogg2pitdogg2 Posts: 16,774
    Rick_Hayes wrote: »
    Well......just got off the phone with Polk. Even after telling the guy I was forum member the price for RD0194 tweeters was 60 bucks each. I'll look elsewhere. ☹

    Somethings not right. they should be 48.00 each for us.
  • F1nutF1nut Posts: 44,826
    Rick_Hayes wrote: »
    Well......just got off the phone with Polk. Even after telling the guy I was forum member the price for RD0194 tweeters was 60 bucks each. I'll look elsewhere. ☹

    They are $54.95 at Midwest, which is the only other place you will find them.

    FYI, $60.00 for a tweeter is cheap compared to many out there.
    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

  • Rick_HayesRick_Hayes Posts: 24
    Made another call to Polk and got a different agent and he did indeed sell me the tweeters for 48 bucks each plus tax and free shipping!! Wound up being 105 and some change!! VERY happy Polk customer.....again!! 😊
  • pitdogg2pitdogg2 Posts: 16,774
    Glad you called back.
  • JazzheadJazzhead Posts: 114
    Sonic Craft has Cardas Binding posts on sale currently that I believe fit the original holes in the binding post cups. Replacing the stock binding posts with these yielded a noticeable sonic improvement on my vintage Polks.
    Polk Audio original RTA-12 (1980) with 12 inch Polk Stands: DHS Speaker Service/David Shirly rebuilt crossovers including Sonicap/Mills, overdamped outer drivers/mirror imaged, tweeter diffraction mod, modified internal bracing, Cardas silver/rhodium binding posts, Neotech UPOCC internal wiring, Sonic Barrier 3-layer, Dynamat
    Ayre K-5xeMP line preamplifer
    Cambridge Audio Azur 840C CD player, Herbie's Audio Lab Super Black Hole CD Mat
    D-Sonic M3a-600M monoblock amplifiers
    NAD 4155 FM/AM tuner
    Silnote Morpheus Reference II Series II balanced interconnects, Virtue Audio single ended interconnects
    Furez 10/2 speaker cable/connectors in shotgun configuration
    VH Audio Flavor 4 power cables, Silnote Poseiden GS UPOCC power cable
    Herbie's Audio Lab system isolation: Tenderfeet, Big Fat Dots, Grungebuster Dots, Little Fat Gliders
    Dedicated 20A/10 AWG circuit, Furutech GTX-D (G) outlet, Furutech eTP80, Shunyata Venom Defender
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