Permanently sealing a vented subwoofer??

Chadnliz,

READ my post again!!! I choose my words very carefully.

I said a PROPERLY designed ported speaker is more difficult
to design than an acoustic suspension.

There are lots of speakers that are ported that are not
designed to properly represent the transfer function of a
high pass filter.

It's not a matter of opinion - the ported system has more
design parameters than an acoustic suspension. Both have
the driver parameters in common. Add to that the volume
of the box - and you have the parameters for the
acoustic suspension. The ported design adds box volume,
plus a number of parameters related to the port - size of
port, acoustic impedance...

Don't tell me to re-think until you re-read!!!

Dr. Gregory Greenman
Physicist

>I certainly dont agree that a sealed accustic suspension is easier to pull off the a port, if so then why is every damn speaker at Best Buy and Wall-Mart, Sears and so on ported? re-think it man!

A ported speaker gets you lower bass without using a larger (more expensive to build, ship, and stock) enclosure (that is also less domestically acceptable and limits the market) or increased (more expensive) power. It gives you the low bass output you want without requiring the sealed sub woofer's higher (more expensive) excursion.

Band-pass and ported designs are ideal when the primary design requirements are cheap and small.

Calm down there Doc

Drew, please contact the engineering departments at B&W, Avalon, Monitor Audio, Proac, Spendor, Eggleston, Wilson, Sonus Faber, VMPS, Harbeth, et. al. and let them know about the problems with their "cheap" and "small" designs.

A properly designed sealed enclosure or acoustic suspension subwoofer will exhibit superior transient capabilities or known as faster group delay response. There are always trade offs and sealed enclosure type subwoofer requires more robust drivers and a whole lot more amplification power. Read latest Absolute Sound article on subwoofer and review on JL Audio Fathom F113 subs and also do google search on Adire Group Delay. For music systems, I like sealed subwoofer designs. For non critical low frequency effect of home theater one note type sub sound there are pleny of ported or passive radiator subs available - Velodyne, Earthquake, Hsu, Sunfire, to name a few. But if you want quality sealed enclosure type subwoofer that can keep up with transient capabilities of your main speakers check out subs like JM Labs Sub Utopia, Focal BE 1000 sub, JL Audio Fathom F113, Zu Method, Martin Logan Descent for starters.