Polk Audio port technology questions.

ChrisD06
ChrisD06 Posts: 929
in DIY, Mods & Tweaks
Short and sweet.

I'm working on a little project. I'm curious if anyone knows how one could design their own ARC (Acoustic Resonance Control) port and tune it to a cabinet, and also how I could design my own Power Port to tune to a cabinet.

Looking at making some RTxxxp matching surround speakers...
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Comments

  • VR3
    VR3 Posts: 28,611
    The arc port was tuned to the resonance of the cabinet. I honestly wouldn't bother trying to replicate this... Polk ultimately has dropped the tech on the newer stuff
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • mhardy6647
    mhardy6647 Posts: 33,766
    edited March 12
    The math for Helmholtz resonators is well established. Nothing magical about ports. It is classical (i.e., non-quantum) physics.
    The shape makes the arithmetic a little more complicated (and, at least in theory, minimizes port noise), but... calculators, computers, and the good ol' spreadsheet take most of the tedium out of doin' the arithmetic.

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  • xschop
    xschop Posts: 5,000
    edited March 12
    From what I've found, Polk's PowerPorts are relatively the same port volume as a standard tube/port, but with that volume residing outside the cabinet within the platform area itself and a very short tube inserted to enclosure.

    There was an excel spreadsheet on the net with the PPort calculations also requiring known driver TS parameters etc. I posted the basic platform/port dimensions ratio diagram here somewhere....

    Edit....

    6m8z0uckrxb0.png


    Don't take experimental gene therapies from known eugenicists.
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  • VR3
    VR3 Posts: 28,611
    The arc, acoustic resonance control port is not the power port
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • ChrisD06
    ChrisD06 Posts: 929
    VR3 wrote: »
    The arc port was tuned to the resonance of the cabinet. I honestly wouldn't bother trying to replicate this... Polk ultimately has dropped the tech on the newer stuff

    Thanks, Trey. I will probably end up not replicating it, but I have always been curious how it worked and what it was even supposed to do.
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  • ChrisD06
    ChrisD06 Posts: 929
    edited March 12
    xschop wrote: »
    From what I've found, Polk's PowerPorts are relatively the same port volume as a standard tube/port, but with that volume residing outside the cabinet within the platform area itself and a very short tube inserted to enclosure.

    There was an excel spreadsheet on the net with the PPort calculations also requiring known driver TS parameters etc. I posted the basic platform/port dimensions ratio diagram here somewhere....

    Edit....

    6m8z0uckrxb0.png


    Oh shoot! If you happen to run across that spreadsheet please send it my way. Otherwise I'll have to do some trial and error using the diagram.
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