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  1. #1
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    Default Where are the passive radiators?

    Us in this part of the forum have a fondness for vintage Polk speakers, and a lot of these speakers include a passive radiator. I enjoy the sound of the PR as do many others, and I feel it is a good design. They can have a higher output than sealed enclosure designs, yet don't have any port noise. Why doesn't Polk use that design anymore?

  2. #2

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    Two things I think.

    1. Cabinet size required for the tuning of the PR and actual size of the PR.

    2. Computer assisted speaker design made it easier to design a ported speaker, and again allowed the speakers to be smaller.

    That being said. Nothing beats cubic inches and surface area IMHO. YMMV.

    Scott
    Last edited by MillerLiteScott; 07-30-2008 at 08:15 PM.

  3. #3

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    1) Cost.
    2) WAF. Big boxes in general are considered unsightly.

  4. #4

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    The new Polk subwoofers use them:

    http://www.polkaudio.com/education/t...icle.php?id=53
    1. JM Labs Electra 920.1 and CC30; MB Quart Vera Sub; Pioneer SC-57; Squeezebox Touch; Panasonic BDT-500 Blu-Ray; Samsung 52" LCD; FIOS; PS Audio Power Plant Premier; MIT S3 cables
    2. Polk SDA-SRS 2.3TL; Sonic Frontiers Line 3 SE; Classe Model 25; Marantz SA8004; Acoustech PH1P; Squeezebox Touch; Music Hall MMF7; PS Audio P1000; MIT S2 cables
    3. Polk SDA 2A; Parasound Halo JC-2 and A21; Musical Fidelity X-DAC; Squeezebox Touch; PS Audio 4.7; MIT S1 cables

  5. #5

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    I thought they had a newer loudspeaker that used Oval Shaped Passives. I think I saw the post in the speaker section. I'll go look.
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

  6. #6

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    The new VM30's have passives.

    Here is the link to there page. VM30
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

  7. #7
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    Well good find, and I stand corrected.

  8. #8

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    I doubt the VM's are the same as a set of Monitor 10's or SDA's for low end but it is nice to see they still use them. I need to hear the VM series.
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

  9. #9
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    I seem to get stuck in my Polk ways and should get out to listen to all the new Polk series. Although, it the VM does have an aluminum tweeter...

  10. #10

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    I found some S6's with the 6.5 passive radiators - do the run off the active driver or crossover?

  11. #11
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    The passive radiator moves because of the changes of pressure in the sealed enclosure caused by the active driver(s).

  12. #12

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    So if my 6.5 driver goes south and dies, the passive won't do squat either, right?

  13. #13

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    Correct.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  14. #14

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    What should I be reading on my DDM if my driver is toast - open? Forgive my noob questions, I'm a bit green yet.

  15. #15

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    Yes it'll be open.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  16. #16

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    Thank you, sir. I apologize for hijacking the thread somewhat. Don't hate me.

  17. #17

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    No problem. We encourage people to ask questions here;)
    BTW Zingo is real cool:)
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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