Closed Thread
Results 1 to 2 of 2

Reload Thread: is this true if so whats the best for me?

  1. #1
    ky babyn's Avatar
    ky babyn is offline Member

    Join Date
    Feb 2004
    st.paul alberta
    Post Thanks / Like
    0 Post(s)

    is this true if so whats the best for me?

    IS THIS INFO TRUE? what type of a box should i build my subs are kinda inbetween heres the specs for mine.
    Vas=2.048251 (cubic feet)
    Fs divided by Qes = 62.2222222......
    based on this info(if its true) should i build a ported or a sealed enclosure?

    Selecting a Subwoofer Alignment
    There are three basic subwoofer enclosure alignments, sealed, vented, and bandpass. There are however, a number of variations of each of these styles. Most subwoofers are designed to function optimally in a specific type of box. Contrary to popular opinion, you don't just select a subwoofer and then decide you want to put it in a sixth-order bandpass enclosure because you heard this type of subwoofer box means the loudest or lowest bass.

    An inexpensive subwoofer loaded in the proper enclosure will sound much better than an expensive one in the wrong box. If you choose the wrong type of box for your speaker, the speaker may sound bad or suffer mechanical damage. There are some general rules to help you decide which alignment is the right one for your subwoofers. You need to compare the Thiele-Small parameters of your driver to the guidelines below.

    Sealed box (and sealed bandpass) woofers should have the following characteristics:

    Qts => 0.40
    Fs <= 35 Hz
    Xmax => 4 mm

    Vented or ported box (and ported bandpass) woofers should have the following characteristics:

    Qts <= 0.40
    Fs <= 45 Hz
    Vas should be relatively low (less than 4 cubic feet unless enclosure size is not a factor).

    An additional calculation to help you determine the proper enclosure is the efficiency bandwidth product. This is figured by dividing the Fs value by the Qes value. If the result is close to one hundred, a vented enclosure is the right choice. Closer to fifty means this driver will function best in a sealed alignment.

    The best results (widest passband) for bandpass subwoofers are obtained when the Fs value divided by the Qts parameter is ninety or higher.
    Last edited by ky babyn; 07-04-2004 at 09:12 PM. Reason: forgot Vas

  2. #2
    violator5spd's Avatar
    violator5spd is offline Post Wh0re Hunter

    Join Date
    Oct 2002
    Post Thanks / Like
    0 Post(s)

    Re: is this true if so whats the best for me?

    From the specs you posted, looks like you should go with sealed. I'm sure vented would work fine though. Do what you want to do!

    - John (AIM - ViolatorJF)

    2000 Dodge Neon

    DEH-P9300, JBL BP600.1, eD15A.22 in 2.5^3ft sealed

Closed Thread

Similar Threads

  1. true power?
    By comp101 in forum Amplifiers
    Replies: 3
    Last Post: 06-22-2004, 10:53 PM
  2. Anyone know true output of a JL Audio 1000/1?
    By 95civicHatchbac in forum Amplifiers
    Replies: 6
    Last Post: 04-16-2004, 10:57 AM
  3. JL Audio TRUE POWER question
    By MTX BUMPA in forum Amplifiers
    Replies: 23
    Last Post: 03-03-2004, 07:54 AM
  4. fosgate amp question true power?
    By davidfre21 in forum General Discussion
    Replies: 11
    Last Post: 01-03-2004, 04:53 AM
  5. Replies: 0
    Last Post: 12-12-2003, 01:15 AM

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum