"Rusty Boudreaux" wrote in message ...
This is off topic but you might want to consider an infinite
baffle arrangement. It's inexpensive and easy to construct
arrangement that yields incredibly clean, low distortion, very
deep bass at unbelievable SPL. Certainly the cleanest and
loudest bass I've ever heard.

With multiple (hidden) drivers you can literally achieve house
damaging levels with a flat response from below 10Hz to well
above 100Hz...at a fraction of the cost of a comparable box sub.
All this without a monster amplifier and no big ugly box in the
corner (and no polyfill concerns). I usually recommend four high
excursion 15" drivers (Stryke AV15 is the current
performance/dollar leader but the older Adire Tempest and Dayton
15" drivers compete well). For $1k total (drivers, amp,
construction materials) you can blow windows out of their frames
without the drivers breaking a sweat (i.e. still within linear
Xmax).

IB maximizes Hoffman's Iron Law. Hoffman's Iron Law states that
the efficiency of a woofer system is directly proportional to its
cabinet volume and the cube of its cutoff frequency (the lowest
frequency it can usefully reproduce). With any box sub there is a
tradeoff between efficiency, volume, and low frequency response.
With IB the volume is 'infinite' which maximizes the efficiency
and cutoff to simply the properties of the bare driver. It
doesn't get any better. Power compression/distortion isn't an
issue like a box sub and you only need a relatively tiny amp.

FAQ:
https://home.comcast.net/~ttriff/

Gallery pictures pages 1 and 2 with construction links
https://home.comcast.net/~ttriff//page2IB-Gallery.html
https://home.comcast.net/~ttriff//page3IB-Gallery2.html

Forum
http://f20.parsimony.net/forum36475/

IB: no box, no box-like sound

I wish I had investigated Infinite Baffles further prior to beginning.
I hadn't envisioned doing an infinite baffle in what appears to be
the standard approach on the websites above. It definitely would lead
to simpler carpentry and no huge boxes in the room. I may move to
this in the near future.

I've already begun work on the 214L box for the Tempest. The wood is
all cut and much of it assembled. I'll go from there.

One question about port tubes. When using flared port kits,
measurements are given for the center tube length. In the case of the
Tempest plans it indicates a center tube length of 11". I'm assuming
this is the actual length of the center tube piece before the flared
ends are attached. The flared ends slip over the center tube so
measuring it afterwards would be about 10.5".

bsguidry