• Passive Radiator Stuff - Some information I've used in the past for doing PR subs.  Contains formulas for calculating mass required.

Passive Radiators

• Ported Information - Formula for calculating port length and measuring Fb

Ported Boxes

• THX Intro ~ Make your Windows start-up open with the famous THX intro.  Everytime you turn on your computer, you can give those little multimedia speakers of yours a good workout.  Just see what your computer sub can do.  Sounds really cool and is a fun download.  Sampled at 44.1 Khz, 16 bit mono .wav file type.  1.35 Mb.

Download THX Intro

• DIY Servo Sub ~ This project was a 4 month long trial with little reward.  Read about what we went through trying to develop a simple feedback controlled subwoofer using an accelerometer and a bunch of op-amps.  This was a Senior Project finished in April of 2000.

DIY Servo Sub

• Basketless PR's ~ Check out this effective way to cheat basketless flat PR's into operating like real passive radiators by mounting two PR's back to back.  Animations show how this method would reduce cantilevering and increase the effective Xmax of the PR's.  Not to mention how much cheaper it would cost for the average DIY'er.

Flat Passives ~ Tricks & Methods

• PR Mass Kit ~ The easiest way to add and remove mass from any passive radiator.  All you need is a bolt, a small piece of MDF, a bunch of washers and a nut.

Passive Radiator Mass Kit

• Impedance Analyzer ~ The ability to accurately and quickly measure the tuning frequency of almost any ported, PR or bandpass enclosure.  Also measures impedance peaks for finding fB of sealed enclosures.  A must for any hobbiest.

Impedance Analyzer

• CAD Drawings ~ Check all the designs and plans for most of the subs I've built as well as a bunch of subs I plan to build in the future.

Coming Soon!

• Guitars ~ This is me playing my new 12 String Ibanez.  When I'm not building speakers, I'm jamming on my guitar.  I've written several songs, but only my wife ever gets to hear them.  Mostly I just like to figure out other popular songs and songs from bands that I listen to.  Check out my Ocean Blue Guitar Chord Archive page to see a bunch of tabs I've written out for just one of my favorite bands.