Polk sda 1c crossover modification thread

VR3
VR3 Posts: 28,797
in DIY, Mods & Tweaks
For some odd reason I thought I had an existing 1c thread but I couldn't find it in search!

Mahogany substrate, laser cut
Custom delrin caps mounts
Jantzen inductors
Clarity csa capa
Jantzen superes resistors
Supra rondo internal wiring
Supra rondo double run sda cable nl4
Aluminum terminal plates

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- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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Comments

  • Faustin
    Faustin Posts: 1,149
    Beautiful. Someone is going to be happy.
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  • VR3
    VR3 Posts: 28,797
    Thank you 😁
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    Full rebuild!

    Clarity cmr
    Path audio
    Jantzen
    Supra
    Point to point

    Dynamat drivers
    Resealed enclosure
    Hurricane nuts
    Black hole 5
    Dreadnought 800va

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    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Conradicles
    Conradicles Posts: 6,139
    Are those Lightman1's speakers?
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  • VR3
    VR3 Posts: 28,797
    I am not 110% sure this gentleman is on the forum but I do not k ow the complete history of the speakers.
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • heiney9
    heiney9 Posts: 25,217
    Sweet. Just when I'm getting ready to put mine up for sale.

    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 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • treitz3
    treitz3 Posts: 19,236
    Conradicles wrote: »
    Are those Lightman1's speakers?

    No and yes. I owned them prior to him. Many (well, maybe one or two owned them prior to me). At the time? They were THE most highly modded 1C's...

    Tom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • treitz3
    treitz3 Posts: 19,236
    Let me put it to you this way....If the tops and bottoms were piano black? Probably. If not, then you are well on your way to surpassing what we had at the time.

    Tiom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • VR3
    VR3 Posts: 28,797
    These initially were stock except for someone who lined the inside of the enclosure with dynamat and I cussed at them while removing it.
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • F1nut
    F1nut Posts: 50,782
    I was wondering what all that black stuff was.
    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

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  • BlueBirdMusic
    BlueBirdMusic Posts: 2,356
    Impecable work and thread!
    "Sometimes you have to look to the past to understand where you are going in the future"

    “Fa sol sol la la fa sol la ... " ~ a soul-stirring sound that is at once alluring and haunting surges through the room as their voices rise and merge. First they sing the notes, then the words from the Sacred Harp hymnal, which was first published in 1844. Sacred Harp a singing tradition that dates back nearly to the founding of the nation.




    Harry / Marietta GA
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  • Gardenstater
    Gardenstater Posts: 4,514
    Works of art crossovers as usual!

    What do you think that dynamat, which is reflective rather than absorbent, would have been doing to the sound quality vs. bare particle board or mdf, which is pretty darn reflective as well?
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • VR3
    VR3 Posts: 28,797
    Thanks guys

    Honestly I'm not sure what the thought rationale behind lining the enclosure with dynamat was but it was very difficult to remove lol
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Gardenstater
    Gardenstater Posts: 4,514
    I don't know if it would have any benefit on panel resonance for MDF but I can definitely see that if you did it you wouldn't want to cover up the grooves that Polk put in the panels, presumably to break up the standing waves?
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • VR3
    VR3 Posts: 28,797
    edited December 2024
    Yeah the Monoque design of the latter series was to break up standing waves and the shapes are different to alter resonant frequencies. See how the side walls have no horizontal tracks where as the back does, etc
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    Installation steps
    Gasket tape terminal opening
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    Install terminal plate
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    Route wiring, hook up sda inductor
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    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    Reinstall insulation
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    Reinstall drivers, replace gaskets if oem gaskets are torn or missing
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    Install crossover, secure wiring
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    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    We have sound!

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    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Conradicles
    Conradicles Posts: 6,139
    edited December 2024
    Great job!
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  • drop1
    drop1 Posts: 23
    Awesome. B)
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  • VR3
    VR3 Posts: 28,797
    edited December 2024
    Sounding good, especially for cold gear and a fresh crossover 😊

    https://youtu.be/o5mpf-AOUAc?si=dtMygEv5UVTI-lMR
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    Insanely better presentation with the diffraction pads installed, easily heard in the video

    https://youtu.be/hZNb0wULqp8?feature=shared
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    A fun set of speakers for sure, thoroughly enjoying it

    https://youtu.be/N-EC2tWr3f0?feature=shared
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    Before hooking them up installed spikes and a cover for the old sda connector
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    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 28,797
    Last video before I call it a night!

    https://youtu.be/BmZKA-3fOa0?feature=shared
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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