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  1. #1

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    Default RTA 15TL Project

    This was an interesting project in several ways. 1st, unlike previous 11 & 15TL crossovers I've done, this one had the late production, smaller square circuit board, and modified binding post cup. Gone were the large round circuit boards, and snap-in nylon stand-offs. This model's stand-offs are molded into the cup. The small circuit board was attached with self-tapping screws.
    The 2nd challenge for this rebuild, was the Decato Mod would be implemented :http://www.polkaudio.com/forums/show...L&daysprune=-1
    This was not a simple re-cap. Essentially, all the Capacitor, Inductor and Resistor values would change. Sonicaps were chosen for the Hi & Lo-Pass for quality, and because Sonicraft was able to give me the custom values I needed. Mills MRA-12 Resistors, and Madisound Inductors round out the new components used.
    The circuit boards were removed, and all connections from the binding post cup were de-soldered. The existing Lo-Pass inductor wrapped around the binding post cup's spool, was cut an the leads folded inside. The molded plastic standoffs were drilled and tapped for M4 threads, and M4 threaded studs were in screwed in. Supplemental riser boards were created using 3/16" Masonite, and a 4 1/4" hole saw. The new riser boards were lightly sanded, cleaned, dressed and new holes drilled for the stand-offs. The New Lo-Pass inductor was made from a stock Madisound 1.8mh 16 gauge Inductor. An LCR Meter was used, and the Inductor was unwound to the precise 1.75mh value needed. The New Inductor was secured to the riser board using 3M VHB Tape, and Nylon Wire Ties. The existing leads from the binding posts were brought up through the center hole of the new riser board, and the board was placed on the new mounting studs. New nylon stand-offs were installed to clear the height of the new Inductor.
    All components were removed from the circuit board, and their locations carefully marked. The New 0.22mh 19 gauge Hi-Pass Inductors were the exact value needed, so no modifications were required. The spool was cut and trimmed to create a flat spot for ease of mounting. New holes were drilled, and nylon wire ties installed to secure the Inductor. To make room, the 2.7 ohm Mills Resistor was installed on the bottom of the circuit board. All three Capacitors were secured with 3M VHB tape, and again, new holes were drilled to allow use of nylon wire ties. The Polyswitches were replaced with 0.5 ohm Mills Resistors, and mounted vertically. The lead from the new Lo-Pass Inductor, and the existing leads from the binding posts were soldered to the bottom of the circuit board. Nylon screws were used to attach the circuit board to the new stand-offs. As a final step, the polarity of the Tweeter must be reversed. I chose to change the female spades on the wire ends, rather than swap the leads at the circuit board. The RDO-198-1s have different size male spade connectors, so this was foolproof. It's impossible to connect them any other way.

    When oh when are they going to straighten out thumbnails.......
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    Last edited by westmassguy; 01-31-2014 at 05:54 AM.
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  2. #2

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    Looks VERY cool!!

  3. #3

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    Thanks man, sounds awesome too with the modifications
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  4. #4

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    One of these days I have to take a ride for a visitation.

    Nice work

  5. #5

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    Quote Originally Posted by NJPOLKER View Post
    One of these days I have to take a ride for a visitation.

    Nice work
    Polkies always welcome. Although tonight would not be good LOL, another 6-12" rolling in tonight
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  6. #6

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    One of these days I'll let you know one of these days and we'll have to arrange it.

  7. #7
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    Way cool. Nice job.

  8. #8

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    Thanks
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  9. #9

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    Nice work Dave, I envy you guys that have this kind of talent. I've always considered myself to be quite handy, I have had to repair and or build a lot of various items over the years (mainly because of financial reasons) but I'm no good with circuit boards and whatnot, just not my bag.
    SDA CRS+4.1TL's/Modded SDA 1C's/Modded SDA SRS 3.1 TL's/Modded SDA SRS 2.3TL

  10. #10

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    Quote Originally Posted by Mike Reeter View Post
    Nice work Dave, I envy you guys that have this kind of talent. I've always considered myself to be quite handy, I have had to repair and or build a lot of various items over the years (mainly because of financial reasons) but I'm no good with circuit boards and whatnot, just not my bag.
    Thanks Mike. I've had a soldering iron in my hand since I was 12 or 13, when my Grandfather first showed me how to change a power supply cap in an old 45 rpm record player.
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  11. #11

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    Quote Originally Posted by j1mmy View Post
    Way cool. Nice job.
    Have to agree way to go MODS

  12. #12

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    Was that a dual compliment pit?
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  13. #13

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    Quote Originally Posted by westmassguy View Post
    Was that a dual compliment pit?
    well not exactly. Just giving the knife a twist

  14. #14

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    Quote Originally Posted by pitdogg2 View Post
    well not exactly. Just giving the knife a twist
    So you didn't read the thread, you're just tracking down all this former member's posts to "twist the knife"
    Very nice.
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

  15. #15

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    But...but his comment was so dead on! It is 'way cool' and a 'nice job'! lol
    --Gary--

  16. #16

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    Quote Originally Posted by westmassguy View Post
    So you didn't read the thread, you're just tracking down all this former member's posts to "twist the knife"
    Very nice.
    I read all your threads trust me I really do. Sometimes I just don't like being a parrot......just sometimes

  17. #17

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    Quote Originally Posted by pitdogg2 View Post
    I read all your threads trust me I really do. Sometimes I just don't like being a parrot......just sometimes
    No worries my friend
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350
    Other:
    SDA-CRS+
    Bose 901 Series II Continentals, Custom Rebuilt Equalizer
    www.dhsspeakerservice.com

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