Polk Audio SDA 3.1TL Modification Thread

This one is almost wrapped up :)

Tweeter Network -
Clarity Cap ESA
Mundorf Mox
Jantzen Inductors

Midbass/SDA Network -
Clarity Cap ESA
Jantzen Inductors
Jantzen C Coil

Stock wiring
Lexan substrate
Point to point network
Custom 3D printed connector plate
Round aluminum terminal plate
Gold Plated insulated binding post
13 Awg Supra Rondo SDA Cable, Neutrik NL4

kiv4lbjl2kyn.jpg
- Not Tom

"No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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Comments

  • FaustinFaustin Posts: 912
    Beautiful work and great attention to detail.
  • VR3VR3 Posts: 23,660
    Thank you sir :D
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • VR3VR3 Posts: 23,660
    These are headed to Singapore :)0dt7scxxhcmw.jpg
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • indyhawgindyhawg Posts: 1,370
    Really nice work, Trey.
  • VR3VR3 Posts: 23,660
    Thank you :-D
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • Hey did you use one of @gimpod's boards?
    What does that kind of upgrade cost?
    (*am I being tacky by asking here?*)
  • Right
    I was asking because in the first pic there is a black circuit board in the background and it looks like one of @gimpod's boards
  • machonemachone Posts: 1,157
    I will be rebuilding the crossovers in my 2.3tl's sometime in the near future. I plan to use gimpod's boards. If at sometime in the future I wish to upgrade the internal wiring I assume that the male half of the Mate-N-Lock connectors would need to be ordered so that a new wiring harness could constructed?
    If so how are the wires attached to the pins inside the male connector?
    Crimped? Soldered?
    Mojo Audio Illuminati v3>>Quantum Byte w/LMS>>Rpi/PiCoreplayer>> Starlight 7 USB >> Mojo Audio Mystique v2 SE>>ModWright SWL 9.0 SE Signature>>Hafler DH-500 Amp+ (Musical Concepts Fully Modded)>>
    SRS 2.3TL (Fully Modded)...SDA-1A (Fully Modded with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Marantz SA 8005
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570
    Sony PS4

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • gimpodgimpod Posts: 1,775
    Crimped, Be aware there are 2 sizes of pins to chose from depending on the wire gauge your going to use, 24-18 and 20-14.
    Pink Floyd, Just makes me want to turn it up too 12 and share it with the world!!. JMO
    ---
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain

    Unfortunately for most of us we only get to experience the first day and then we can't even remember it.
    ---
    "Close only counts in Horseshoes, Hand Grenades and Thermonuclear Weapons."
    "50% Why... That's almost half."
    "I know, I'm sick and need help."
    ----
    Gimpod Custom 4th & 5th Gen SDA Circuit Boards
    ----
    "The best way to enjoy digital music reproduction is to never listen to good analogue reproduction." ~ Kenneth Swauger
  • Hey howcome the 3.1's don't get as much love on this forum as all of the other SDA's???
    This is the model that I see mentioned the least even compared to the CRS's even.
  • gimpodgimpod Posts: 1,775
    Because they were only made in the last 1 or 2 years of the SDA production and were only about $500 less than the SDA SRS 2.3TL so most went with the SDA 1C ($200 cheaper) or the more impressive looking 2.3TL IMO even the wood 1C is better looking. I'm not knocking the 3.1 there a good sounding speaker they were just an oddball speaker in the SDA line between the SDA 1C and the SDA SRS 2.3TL. Also I don't think Polk made that many of them
    Pink Floyd, Just makes me want to turn it up too 12 and share it with the world!!. JMO
    ---
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain

    Unfortunately for most of us we only get to experience the first day and then we can't even remember it.
    ---
    "Close only counts in Horseshoes, Hand Grenades and Thermonuclear Weapons."
    "50% Why... That's almost half."
    "I know, I'm sick and need help."
    ----
    Gimpod Custom 4th & 5th Gen SDA Circuit Boards
    ----
    "The best way to enjoy digital music reproduction is to never listen to good analogue reproduction." ~ Kenneth Swauger
  • I had the SDA-1B and the SDA-1C. 21 years ago I had a choice between the 1C's and a pair of 3.1TL's. I WANTED the 3.1's,but was in unstable living conditions at the time.So I wound up choosing the 1C's because I had already owned their predecessors the 1B's. 20 years later I had the opportunity to find out just what I had missed and BOY AM I GLAD I DID!!!! (*see my posts on the Laserdisc thread*)

    Your point is well taken though @gimpod
    One of these days when I get my finances straightened back up I plan on purchasing a pair of your crossover boards as they and you are both legend sir!
    Hopefully they won't be sold out by then :D
  • Gunther16Gunther16 Posts: 245
    IMO the 3.1TL was a result of advancement. Same soundstage as its bigger brothers, improved sonics (IMO), smaller footprint but big, big sound. Back in 1992 I read a review somewhere where the reviewer commented that the 3.1TL was the most audiophile speaker out of the 3 models and I tend to agree. Having had all 3 models in the series at one time or another over the years the only survivor of the family are the 3.1TL which by the way were the first I owned and will be buried with me when the time comes. LOL. Although the bigger brothers were superb their footprint in my environment was just too big. Therefore IMO the 3.1TL's are the better fit of the 3 and thanks Gimpod I love owning rareties with your outstanding boards.
    Love my 3.1TL's
  • Toolfan66Toolfan66 Posts: 14,311
    I guess it's just subjective, because I wasn't fond of the 3.1tl's..
  • gwg_97gwg_97 Posts: 331
    Trey -

    Did you use two 2.7 ohm resistors to make a 1.3 ohm value for each crossover?
    
    
    System 1:
    Nakamichi PA-7
    Kenwood Basic C2
    Polk SDA 1C modded
    HiFiMe DIY DAC
    Ipad/Tidal

    System 2:
    Dynaco ST-70
    Polk Monitor 5B modded
    Kenwood Basic C2
    Airport Express/Ipad/Tidal

    Home Theater:
    Carver A-760x
    Outlaw Audio M200
    Kenwood Basic M2A x 2
    Yamaha RXV 665
    Polk SDA SRS 3.1TL
    Polk Monitor 5B
    DIY Polk Center Channel Speaker
    HSU VTF-3 MK4

  • VR3VR3 Posts: 23,660
    This has been a while ago I'm unsure but I will parallel resistors to hit certain values so possibly
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • I want one of theeeeezzzze
  • You got any pics of your progress so far on mine?
    Or are you still waiting for the parts to arrive?
  • VR3VR3 Posts: 23,660
    It will be a few more weeks before any pics, the inductors come from across the ocean :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • Let me know if they finally get them fancy,schmancy new ones for the tweeters ;)
  • honestaquarianhonestaquarian Posts: 2,555
    aedf9pzu2gsm.jpg

    Hey Trey
    Just curious
    When did they stop making the 3.1's?
    I could have sworn it was 1991. I just opened mine up to install the Blackhole 5 and do the glue thing and look at what I found.
    So far the drivers I have pulled also say made in 1992.
  • honestaquarianhonestaquarian Posts: 2,555
    Oh wait wasn't 1991 the FIRST year they built them??
    BACKWARDS!
  • F1nutF1nut Posts: 43,406
    edited March 2017
    Nope, started production in 1989.
    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

  • VR3VR3 Posts: 23,660
    edited May 2017
    Almost there :) (still have to change out those silver bolts for the black ones Carlton wants)

    bdakt4yxhuru.jpg
    iawr4od9qh6w.jpg

    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • honestaquarianhonestaquarian Posts: 2,555
    Trey
    NICE!!!! (*understatement*)
    Did you mark the internal,upgraded speaker cables? Because I don't remember what goes where.
    Also just curious about the difference between mine and the one you did at the beginning of the thread, besides the change to the singe large connector.
  • VR3VR3 Posts: 23,660
    edited May 2017
    Thank you! Pretty similar, I just have been refining my Fortress V2 line to a "standard work" practice over the past few years.

    From a part standpoint, the stereo circuit uses a single cap versus parallel and the tweeter caps are the new CSA series... plus the single connector.

    Otherwise, not much difference :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • honestaquarianhonestaquarian Posts: 2,555
    What is the change that using that great big single cap versus the two going to make?
  • LegenderLegender Posts: 478
    This work looks awesome. Great job. As a relatively new owner of stock 3.1 TLs I'll be headed deep down this rabbit hole I'm sure.
  • VR3VR3 Posts: 23,660
    Thank you :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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