Originally Posted by Micksh
^^^Someone who gets it here...
Thanks. I had left car audio for a long time to focus on other things. Not that I was a competitor or anything like that, but I started building boxes when I was 13-14 yrs old and started with two books, Ray Alden's Speaker Systems, and Vance Dickason's Cookbook, with a basic 4 function calculator, volt/ohm meter, resistors, and a signal generator. That was all I needed to accurately determine (within about 5%) all the necessary T/S parameters, and even VERIFY actual enclosure tuning. I would even call my local weather center to ask about current temperature/humidity/baro. pressure in order to be able to calculate air density to accurately determine the speed of sound for the Vas calculation. I even had to discover on my own how to raise a number to a decimal exponent WITHOUT having a convenient "x²" button, or a square root button on my calculator. Ya'll should try doing that without
help from google.
Now a days, life is much easier with computers and hardware like the WT3/DATS. No offense to whoever likes "sq in per cube", but it just doesn't jive. It's not like you can arbitrarily CHOOSE to make a box 1 ft³ and ONLY use 14 in² for a massive 15" subwoofer that can move 1"+ each way. Same thing goes the other way--you can't just make a 80 ft³ box for a 12" woofer and accurately reason you need, say, 12in² for EACH cubic foot, especially when the woofer can only do 3/4" peak-to-peak excursion--you'd end up with a ginormous 960 in² of port area--equivalent to twelve
12" woofers! Ridiculous! More excursion for a given woofer diameter simply requires more port area to keep vent velocity low to avoid port compression losses, plain and simple. It's been in the books for decades and nothing has changed about the rules of physics.