last updated: Friday, 02-Apr-2004 23:22:51 EST
- audio home
- The Vifa X3
- Preamp
- Car Audio
- Shiva!
- PA Speakers
- Hafler stuff
- Phase Linear
- LM3886 amp
- lm12 amp
Shiva.
Shiva and PR simulations are available. They'll have to do until I get mine measured.
I built yet another pair of subs in winter 2001/02 based on the venerable Shiva from Adire Audio. They're a dual Shiva / dual PR-15 design in 3 cubic feet. Powered with about 1250w per box (that's 625w per driver, or 312.5w per coil) and the bass can get scary loud :-) Perfect, don't you think?
Me too.
The boxes for the second ones are all MDF, with a bunch of bracing, a fair amount of stuffing, and a bunch of thump. Pictures of their construction are now on line.
The enclosure I used for my first pair is a cube about 14" on a side. I made the first one out of what is handy (3/4" MDF). The second was created on a picnic bench during the 199 Purdue - Notre Dame football game. Pictures are available. As it stands, the box uses 4 side panels that are 12 1/2 x 13 1/4 x 3/4. The front and back panels are 14 x 14, and there is an internal mounting plate that is 12 1/2 x 12 1/2. With this enclosure volume (25.5L) there is the need for some active EQ. A high pass filter with a Q of 1.6 and a corner frequency of 13Hz does the trick nicely, The bump in the passband is 4.1dB, making the system rather flat from ~17-70Hz. The bass EQ circuit looks like this:
As an aside, I put a KG5230 in the back of each box. I sold one to Mike and the other one was a gift ot my dad for Christmas 2000. The 30Hz bump on the amp really helps out, and the sweepable LPF rocks. For the cost, I can't think of a better way to take up 1.5cuft with bass.
