Anyone who's tuned their 20-39pc+, gotta question...

Discussion in 'Archived Threads 2001-2004' started by JohnTKline, Dec 15, 2002.

  1. JohnTKline

    JohnTKline Stunt Coordinator

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    If you've tuned it down to 16Hz with the port blocker, have you noticed any difference in losing any power at your listening levels? Or was it insignificant compared to the lower bass response. I hope I worded that correctly...

    John
     
  2. Chris Tsutsui

    Chris Tsutsui Screenwriter

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    I don't have SVS but in my experience with tuning a tempest: Lower tuning meant the bass was able to hit slightly deeper but it's not as easy to hear. When the box is tuned higher, it produces a more noticeable amount of mid bass and loses some of the deep stuff.

    If deep bass isn't missed in most of the stuff you listen to and you like slam for HT then I'd use the higher tuning. It gives your bass some headroom and allows for some higher SPL at the sacrifice of deeper bass.
     
  3. Mark Kreisberg

    Mark Kreisberg Auditioning

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    I did not notice a difference with one port plugged. I did, however, when I plugged both ports. My 20-39PC+ is currently tuned to 16Hz.
     
  4. Edward J M

    Edward J M Cinematographer

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    I can immediately notice when one port is plugged and my B&K SPL meter confirms it - SPL drops about 1-2 dB when a port is plugged. This is expected, of course, in exchange for a lower tuning point. Recalibration is in order after a port plug is used.

    Interestingly enough, I found simply dropping the SS filter to 16 Hz and leaving all three ports open actually increased SPL when the Ring drops to the ground in the opening scene of LOTR-FOTR. That passage must contain significant SS content.

    A typical HT room gives some extension and reinforcement - maybe another 3-4 Hz. I've been wondering if it might be beneficial to run all three ports open and have the SS filter set to 16 Hz to take advantage of typical room extension.

    What do you guys think?

    Ed
     
  5. Robb Roy

    Robb Roy Supporting Actor

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    I have recalibrated after each tuning, and my 20-39PC+ has been able to fill my 20x20 HT area at each point with no problem. If there is a difference after calibration, I haven't been able to notice it yet (I'm still experimenting).

    -Robb
     
  6. Yee-Ming

    Yee-Ming Producer

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  7. Edward J M

    Edward J M Cinematographer

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