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- Newsgroups: rec.audio.car
- Path: sparky!uunet!psinntp!panix!moskowit
- From: moskowit@panix.com (Len Moskowitz)
- Subject: Re: Isobarik subwoofer design
- Message-ID: <C09295.AFz@panix.com>
- Organization: Panix Public Access Internet & Unix, NYC
- References: <demaine.725706735@ee.ualberta.ca> <1992Dec31.100944.25729@oracle.us.oracle.com> <demaine.725930777@ee.ualberta.ca>
- Date: Sat, 2 Jan 1993 23:22:16 GMT
- Lines: 19
-
- Cal Demaine writes:
-
- >Well, with the drivers mounted back to front, and wired IN PHASE, the volume
- >of the tunnel is immaterial.
-
- Not quite. The spacing of the drivers in the tunnel affects the
- frequency at which "isonulls" and "isopeaks" appear in the frequency
- response of the system. The dirvers are never completely identical and
- you get destructive and constructive interference within the tunnel.
- The shorter the tunnel, the higher the frequency at which the
- interference occurs. Ideally you want them above the frequency range of
- the composite woofer.
-
- Speaker Builder magazine had a construction article that confirmed this
- rather non-intuitive effect.
-
- --
- Len Moskowitz
- moskowit@panix.com
-