1. Sign-up to become a member, and most of the ads you see will disappear. It only takes 30 seconds to sign up, so join the discussion today!
    Dismiss Notice

Concerns

Discussion in 'Archived Threads 2001-2004' started by Frank Kanyak, Apr 26, 2002.

  1. Message #1 of 7 Apr 26, 2002
    Frank Kanyak

    Frank Kanyak Stunt Coordinator

    Joined:
    Feb 28, 2002
    Messages:
    240
    Likes Received:
    0
    Trophy Points:
    0
    It has been about a week since I built my sonosub(http://frank18202.tripod.com/sonosub...ion/index.html). I ran most of the reference material that I have(Titan A.E., Saving Private Ryan, Star Wars TPM, T2 Ultimate Edition, etc.) Mostly impressed by the THX intro from TPM it was scary!!! And everything in T2 was incredible. Now my concern, I live in a bi-level house and my theater is located in the basement family room. For the first time I went to get a drink and I felt everything, and I mean everything vibrate to the point that is this going to damage something??? I then proceeded to sit in my upstairs recliner and during the Pod Race scene (-5 from reference) I felt this very strong sense of energy(bass). It was GREAT!!! All I am powering this is with a 10 year old Technics amp with a built EQ. I have a huge bump in the 50-63 hz region. In the near future I plan on buying a BFD and a Samson s700 or a QSC amp. This kind of bass is unbeleivable.
     
  2. Message #2 of 7 Apr 26, 2002
    Ron-P

    Ron-P Producer

    Joined:
    Jul 25, 2000
    Messages:
    6,284
    Likes Received:
    7
    Trophy Points:
    0
    Real Name:
    Ron
    I had a 10db peak at 40-45Hz. I completely killed the peak with adding more poly-fill to the sub. My only peak now is 2db at about 60Hz. Before you go and spend money on a BFD and just electronically remove the peak, try tweaking the sub at bit.
    Peace Out~[​IMG]
     
  3. Message #3 of 7 Apr 26, 2002
    Frank Kanyak

    Frank Kanyak Stunt Coordinator

    Joined:
    Feb 28, 2002
    Messages:
    240
    Likes Received:
    0
    Trophy Points:
    0
    I have a ported design. Where would be the extra poly-batting help? Along side the inner walls or more around the port? Thanks Ron-P.
     
  4. Message #4 of 7 Apr 26, 2002
    Mark Krawiec

    Mark Krawiec Agent

    Joined:
    Jan 9, 2002
    Messages:
    49
    Likes Received:
    0
    Trophy Points:
    0
    If you have a ported sub, be very careful about adding stuffing.

    Will it work to get rid of those pesky room peaks-it sure will, but not in a good way.

    If you stuff a ported box you will decrease the Q of that box. Unfortunately, this will have the effect of reducing port output. How much, well you'd have to measure it.

    Too much stuffing and you can effectively convert your box to a sealed sub (not quite, but more or less). And if there is no bass output from the port, well, then, you won't have any pesky room modes excited, eh?

    A ported box should have the sides lined and maybe, maybe some light stuffing away from the woofer and port (again, without measuring equipment, it's hard to say)
     
  5. Message #5 of 7 Apr 26, 2002
    Mark Hayenga

    Mark Hayenga Supporting Actor

    Joined:
    Jun 11, 1999
    Messages:
    607
    Likes Received:
    0
    Trophy Points:
    0
    Do NOT stuff a ported sub, unless you REALLY know what you're doing. I didn't know what to think of the practice until I measured the difference it made. In my case, it shot my port Q to shit (made its output more broad and lower in amplitude) and messed up the boxes loss parameters. Here's the results of the stuffed vs. unstuffed impedance sweep:
    http://www.hayenga.com/mark/tempests/tempestcomparo.gif
    Red is stuffed, orange unstuffed. Notice the severe change in LF impedance caused by the stuffing.
    PS - this was only 50% fill.
     
  6. Message #6 of 7 Apr 26, 2002
    Wes Nance

    Wes Nance Stunt Coordinator

    Joined:
    Jan 1, 2002
    Messages:
    249
    Likes Received:
    0
    Trophy Points:
    0
     
  7. Message #7 of 7 Apr 26, 2002
    Greg Monfort

    Greg Monfort Supporting Actor

    Joined:
    May 30, 2000
    Messages:
    884
    Likes Received:
    0
    Trophy Points:
    0
    Yeah, I stuff vent designs regularly to get the vent Q I want, but these are higher Fb drivers, so it's needed to keep them from sounding boomy. For low Fb subs though it's the last thing you normally want to do.

    WRT PR designs, I stuff them, but you have to take it into account as it increases the apparent Vb, just as it does a sealed.

    GM
     
(You must log in or sign up to post here.)

Share This Page