Anyone modified the wiring of SDA-1C

restanim
restanim Posts: 227
edited July 2009 in DIY, Mods & Tweaks
I am concidering ditching (NOT throwing away) the SDA cable and wire the SDA drivers in parallel with the stereo drivers. I did identify the fact that each SDA driver is wired in series as well as the stereo drivers.

This will be just a trial run and may not be permanent.

Comments?

Mike
polkaudio

Currently Own:
RTA-11T Light Oak, Aug/2011 to present
SDA-CRS+ Aug/2011 to present
RTA-11T Black, Dec/2013 to present

Previously Owned:
SDA-SRS 2.3 May/1990 to June/1991
SRS 1.2TL June/1991 to May/1995
SDA-1C Aug/2005 to Dec/2011
SRS 1.2TL Sept/2009 to Sept/2015
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  • Face
    Face Posts: 14,340
    edited July 2009
    Why?
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Serendipity
    Serendipity Posts: 6,975
    edited July 2009
    Wouldn't this negate the SDA effect?
    polkaudio RT35 Bookshelves
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  • restanim
    restanim Posts: 227
    edited July 2009
    Why? Well, I prefer standard stereo sound and I would expect more output from all four drivers as opposed to just the two stereo drivers.

    Remember, this is just a trial and I may not like the result.
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • Systems
    Systems Posts: 14,873
    edited July 2009
    For one I'm thinking you will end up with a frequency balance problem with all 4 drivers operating as the stereo array because the midrange and bass levels will be increased but the tweeters level will not have changed.
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  • restanim
    restanim Posts: 227
    edited July 2009
    Yeah, I did concider the output of the mid/mid bass would be higher. I would use my equalizer to smooth this out.

    Thanks!
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • heiney9
    heiney9 Posts: 25,382
    edited July 2009
    Sell them and get conventional speakers. The x-overs are designed to run the dimensional drivers over a very specific freq range. Simply disconnecting them will not get you what you desire.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited July 2009
    Sell me your 1C's and get some different speakers...lol
    The nirvana inducer-
    APC H10 Power Conditioner
    Marantz UD5005 universal player
    Parasound Halo P5 preamp
    Parasound HCA-1200II power amp
    PolkAudio LSi9's/PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Speaker Cables and IC's
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  • Systems
    Systems Posts: 14,873
    edited July 2009
    Just to add,while the schematic shows the midbass's for both the DA and SA sections operate over the exact same range ,(the difference in crossover values is due to a parallel connection for one array and series for the other) paralleling the two sections will likely result in a very low impedance.
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  • restanim
    restanim Posts: 227
    edited July 2009
    I see the SDA drivers are in parallel, I would definitely wire them in series.
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • Systems
    Systems Posts: 14,873
    edited July 2009
    restanim wrote: »
    I see the SDA drivers are in parallel, I would definitely wire them in series.
    But then the crossover frequency will change due to it seeing a different load.
    Testing
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  • restanim
    restanim Posts: 227
    edited July 2009
    This is what I intend to do:
    The Stereo drivers wired in series.
    The SDA drivers wired in series.
    Then wire the SDA drivers in parallel with the Stereo drivers.
    The SDA drivers will be dis-connected from the SDA part of the crossover.

    Mike
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • Systems
    Systems Posts: 14,873
    edited July 2009
    restanim wrote: »
    This is what I intend to do:
    The Stereo drivers wired in series.
    The SDA drivers wired in series.
    Then wire the SDA drivers in parallel with the Stereo drivers.
    The SDA drivers will be dis-connected from the SDA part of the crossover.
    What you are proposing would only work (without shifting the crossover frequency) if the impedance of the four drivers combined had the same impedance as that of the two series connected SA drivers.Otherwise you would have to duplicate the crossover of the SA section for use with the DA pair and connect them in series,then connect both the SA and DA sections in parallel.In other words not a simple fix.


    I see that the midbass drivers in each section are different models (6510's 6511's,)Anyone know the what differences are between them? impedance? sensitivity? or both?
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  • heiney9
    heiney9 Posts: 25,382
    edited July 2009
    GV#27 wrote: »
    Anyone know the what differences are between them? impedance? sensitivity? or both?

    The exact information is proprietary, but that's a very good guess. The voice coils on some of the MW drivers are wound differently as well.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • restanim
    restanim Posts: 227
    edited July 2009
    Ha Ha!
    Bose junk? NO THANKS!
    I don't need anymore speakers.

    I'll just hook up my Legacy Audio FOCUS.
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited July 2009
    That sounds like a lot more work than it's worth...

    I'd just sell the 1C's and get some different speakers.
    The nirvana inducer-
    APC H10 Power Conditioner
    Marantz UD5005 universal player
    Parasound Halo P5 preamp
    Parasound HCA-1200II power amp
    PolkAudio LSi9's/PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Speaker Cables and IC's
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  • dane_peterson
    dane_peterson Posts: 1,903
    edited July 2009
    You have to understand... what you're proposing to this forum is, for the lack of a better word, blasphemy. SDAs were specially designed to be run the way they are wired.

    There is a reason there are not many speakers out there made with 4 like drivers side by side. If you prefer standard stereo, there is absolutely no purpose in going through this work. Your Legacy Audios are on a vertical axis FOR A REASON... does this make sense?

    If you're dying to tear open the SDAs... do so to upgrade the crossovers or something. What you're suggesting is like converting a sports car to diesel, just because you prefer diesel.
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  • restanim
    restanim Posts: 227
    edited July 2009
    Well fellas, I am convinced NOT to do this mod.
    Thanks for all your input,
    Mike
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • george daniel
    george daniel Posts: 12,096
    edited July 2009
    restanim wrote: »
    Well fellas, I am convinced NOT to do this mod.
    Thanks for all your input,
    Mike

    No,, Thank You :)
    JC approves....he told me so. (F-1 nut)
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  • wutadumsn23
    wutadumsn23 Posts: 3,702
    edited July 2009
    Whew, that was close one. Almost lost a perfectly good pair of 1C's to "curiosity" lol.
    HT Rig
    Receiver- Onkyo TX-SR806
    Mains- Polk Audio Monitor 70
    Center- Polk Audio CS2
    Surrounds- Polk Audio TSi 500's :D
    Sub- Polk Audio PSW125
    Retired- Polk Audio Monitor 40's
    T.V.- 60" Sony SXRD KDS-60A2000 LCoS
    Blu-Ray- 80 GB PS3


    2 CH rig (in progress)
    Polk Audio Monitor 10A's :cool:

    It's not that I'm insensitive, I just don't care.. :D
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited July 2009
    restanim wrote: »
    Well fellas, I am convinced NOT to do this mod.
    Thanks for all your input,
    Mike

    Thank you!

    So do I need to take a road trip to New York and buy your 1C's?:cool:
    The nirvana inducer-
    APC H10 Power Conditioner
    Marantz UD5005 universal player
    Parasound Halo P5 preamp
    Parasound HCA-1200II power amp
    PolkAudio LSi9's/PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Speaker Cables and IC's
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited July 2009
    Just run them without the innerconnect cable and you'll be good to go.
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  • restanim
    restanim Posts: 227
    edited July 2009
    comfortablycurt wrote: »
    Thank you!

    So do I need to take a road trip to New York and buy your 1C's?:cool:

    No need to, they are staying here as Polk designed them. BTW they are in immaculent shape with the RD tweeters.
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • restanim
    restanim Posts: 227
    edited July 2009
    leroyjr1 wrote: »
    Just run them without the innerconnect cable and you'll be good to go.

    Yeah, that seems to be an easier solution as to what I was trying to achieve. But, the interconnect cable stays.
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • lightman1
    lightman1 Posts: 10,795
    edited July 2009
    Was getting ready to road trip for an intervention.....and pick up Curt along the way.....
    Dodged that bullet.
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  • wutadumsn23
    wutadumsn23 Posts: 3,702
    edited July 2009
    lightman1 wrote: »
    Was getting ready to road trip for an intervention.....and pick up Curt along the way.....
    Dodged that bullet.

    I was willing to be the "muscle" for the trip if needed, lol. Then ditch you two on the way home and enjoy my new 1C's, lol.
    HT Rig
    Receiver- Onkyo TX-SR806
    Mains- Polk Audio Monitor 70
    Center- Polk Audio CS2
    Surrounds- Polk Audio TSi 500's :D
    Sub- Polk Audio PSW125
    Retired- Polk Audio Monitor 40's
    T.V.- 60" Sony SXRD KDS-60A2000 LCoS
    Blu-Ray- 80 GB PS3


    2 CH rig (in progress)
    Polk Audio Monitor 10A's :cool:

    It's not that I'm insensitive, I just don't care.. :D
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  • lightman1
    lightman1 Posts: 10,795
    edited July 2009
    wutadumsn23 wrote: »
    I was willing to be the "muscle" for the trip if needed, lol. Then ditch you two on the way home and enjoy my new 1C's, lol.
    About 7000 miles to save a set of 1C's..worth it.. say the word.
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  • Systems
    Systems Posts: 14,873
    edited July 2009
    lightman1 wrote: »
    Was getting ready to road trip for an intervention.....
    LOL :D seems like a few of you had one foot out the door ready to spring into action.
    Testing
    Testing
    Testing
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  • restanim
    restanim Posts: 227
    edited July 2009
    We should call you guys the "Polk Police" ;)
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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  • lightman1
    lightman1 Posts: 10,795
    edited July 2009
    GV#27 wrote: »
    LOL :D seems like a few of you had one foot out the door ready to spring into action.
    Hell...I had the car started by the last keystroke!
    Glad you came to your senses, ritalin.
    Curt has a bad disposition...worse than mine.
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  • restanim
    restanim Posts: 227
    edited July 2009
    I probably should have asked what a non SDA speaker with similar sound to the 1C I could aquire. Looking at Polks line-up, The Monitobr 12 seems to be a good choice.
    Suggestions?
    polkaudio

    Currently Own:
    RTA-11T Light Oak, Aug/2011 to present
    SDA-CRS+ Aug/2011 to present
    RTA-11T Black, Dec/2013 to present

    Previously Owned:
    SDA-SRS 2.3 May/1990 to June/1991
    SRS 1.2TL June/1991 to May/1995
    SDA-1C Aug/2005 to Dec/2011
    SRS 1.2TL Sept/2009 to Sept/2015
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