| The Subwoofer DIY Page - Discussion Forum
|
[
The Subwoofer DIY Page - Discussion Forum ] [ FAQ ] |
|
[Previous Message]
[Next Message]
|
|
Date: March 22, 2003 at 01:03:03
From: norman bates, [oproxy2.rockwellcollins.com]
Subject: I use Eminance (bought on closeout parts-express $100 each) |
|
|
18s have qts near .34, Fs 28hz and vas can't remember. 8 ohm drivers, 96db spl 1w/1m. Paper with accordian surround. The car audio guy that built the boxes scoffed at them. Them we hooked em up after boxes were built. He said that's alot fast than I'd ever heard out of 18s.
The bracing and such you'll have to figure out brace space, I figure .125ft3 for an 18" motot stuff of space.
ports can be pvc or cardboard tube used for concrete pillars availiable at home depot.
128db is a lot easier to reach at 28hz than it is at 15hz. You can put in over 100 watts at tuning, but even on my subs, 1 box can take 800 watts rms at tuning frequency (won't go louder than if had 200 watts though due to voice coil heating/losses and compression) but it would only take 100 watts at 40hz on 1 driver to bottom 1 out.
the excursion on a ported is similar to a sealed until about 1/3 octave above tuning, then the excursion decreases till tuning, then skyrockets below it.
28hz tuning is fine for me. The ported I recommend will go a lot lower louder below 28hz than mine, but
you probably would be lucky to get above 110db from 30 to 25 hz without bottoming them out.
|
|
|
| View the previous message in this thread
Go to the top of this thread
View entire thread |
Posted with TalkShop version
2.74 |
[Previous Message]
[Next Message]
|
|
|
Follow Ups: |
|
|
[
The Subwoofer DIY Page - Discussion Forum ] [ FAQ ] |
|