home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.audio
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnews!wkb
- From: wkb@cbnews.cb.att.com (wm.keith.brummett)
- Subject: Re: Subwoofer Cookbook question
- Organization: AT&T
- Distribution: usa
- Date: Wed, 30 Dec 1992 22:56:46 GMT
- Message-ID: <1992Dec30.225646.15759@cbnews.cb.att.com>
- References: <1992Dec30.131909.22613@oracle.us.oracle.com>
- Keywords: design JBL subwoofer
- Lines: 30
-
-
- In article <1992Dec30.131909.22613@oracle.us.oracle.com>,
- ldormon@uk.oracle.com writes:
- > ...
- > I've inherited one JBL 45/60 cab with a JBL 2225 driver.
- > The cab is far to big to use in my room, so I thought I'd take the
- > driver out and build a box that would fit under my bed.
- > ...
- > All the calculations I do seem to come up nonsense, could some tell
- > me what I'm doing wrong, or be kind enough to run it though
- > Perfectbox or something, I'm looking for low f3 and have about
- > 15ft^3 to play with. ...
-
-
- I fired up PerfectBox for this driver, but I think the results will not
- be to your liking. In short, this doesn't appear to be a driver
- designed for subwoofer use. I let the program use all of its default
- parameters for a 4th-order alignment, and it came up with a 2.23ft^3
- box tuned to 54Hz. The -3dB point was 64Hz, and -10dB was 44Hz. I
- played around with 2nd and 5th-order boxes, too, but nothing came up
- that looked like a subwoofer. Never got the response down into the
- 30's. Sorry.
-
- -- Keith
-
- --
- | (614) 860-3187 Copyright (C) 1992, by AT&T, Room 3B202 |
- | att!cblph!wkb or, W.K. Brummett and AT&T 6200 E. Broad St. |
- | wkb@cblph.att.com All rights reserved. Columbus, OH 43213 |
- `----------------------------------------------------------------------'
-