Passive radiator vs. Vented

Discussion in 'Home Theater Projects' started by Jonathan T, Jan 16, 2004.

  1. Jonathan T

    Jonathan T Second Unit

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    I modeled 1 AV-15 with both passive radiators and as a vented box. At 5 cubic feed, the output is almost identical. But, what's the difference SQ wise?

    O, and do you think a 5 cubic foot sealed Av-15 would be sufficient for most movie sound tracks (assuming I don't want to break windows)?
     
  2. MattD

    MattD Stunt Coordinator

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    How big is your room? I have an AV12 in a 14'x20' room and it is more than enough to rattle pictures off the wall.
     
  3. Eric Eash

    Eric Eash Second Unit

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    there shouldn't be too much difference in SQ. the PR sub might have a little bit better transient response. mainly, PR are great for small boxes as a low tuned vented box can require more room for a vent than available, and most people don't want their port sticking a foot out of their enclosure. if you're box is big enough, vented is waaaay cheaper.

    eric
     
  4. Rob Formica

    Rob Formica Stunt Coordinator

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    PR's also eliminate the risk of any port noise... so they do have a slight SQ advantage. But then again, as already mentioned, the main benefit is providing low tuning in a small enclosure.
    Rob
     
  5. Jack Gilvey

    Jack Gilvey Producer

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    The transient response of a PR sub is measureably inferior to the "same" alignment using ports. You've got to have better ears than mine (and a better room) to hear it, though. The advantage is that you can have adequate resonator Vd in a small box.
     
  6. Jonathan T

    Jonathan T Second Unit

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    The room I would be using is about 18X12. It's open on one side. I was thinking of using 2 subs because I read a paper somewhere that said 2 subs or more can can help nullify "bad" nodes and excite the "good" ones.
     
  7. Jonathan T

    Jonathan T Second Unit

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    Thanks for the info on PRs. I was really just curious as to each would sound. I don't have money for 4 100 dollar PRs for 2 AV-15 subs. So, it's gonna be either sealed or ported. And it'll probably be sealed, as this will be a 2 channel system. I don't have money for a multichannel theater right now.
     
  8. Allen Ross

    Allen Ross Supporting Actor

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    why not ported, you need the small enclosure?
     
  9. Jonathan T

    Jonathan T Second Unit

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    Well, no, but sealed enclosures are condusive to "tighter" bass, correct?

    It's been a while since I've discussed or thought about DIY audio
     
  10. AllanRW

    AllanRW Second Unit

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    I did a AV15 in a 24" cube for Craig WoodhallCraigs ported AV15
    As far as I know he is very happy with it.


    Al
     
  11. Craig Woodhall

    Craig Woodhall Supporting Actor

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    yip, love your work Al! thanks again.
     
  12. David_P

    David_P Stunt Coordinator

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    Craig... I sent you a PM. Please check.

    thanks.

    Dave P
     

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