On 05/04/2011 07:18 PM, Eric Benjamin wrote:
Here's what I think really happens. For low frequency sounds reproduced in
ordinary rooms, the first arrival at the listener's two ears naturally has ITDs
that correspond to the direction of the source. After a short period of time,
reinforcement of the sound by reflections from the room boundaries changes the
phase of the sounds at the ears. This can be more easily seen by considering
the modal structure of the room at low frequencies. The room has relatively few
modes and the sound wave quickly becomes constrained to travel in the modes.
what about the situation of four woofers with a hypercardioid (or even
figure-of-eight) decode? isn't there reason to hope that you will be
able to get a dryer bass response that won't be restricted to room
modes, doesn't excite the room modes as much, and could reach further
down than the room dimensions would allow?
i haven't been able to try this out at home yet, unfortunately.
i did use four sub stacks in our large-scale rig test with eight line
arrays, and the result was quite pleasing. but the situation was
different in that the room was very large (a warehouse about 10m high
and about 40x20m). we found that for maximum dance and rocknroll
"oomph", we preferred a sub-cardioid decode rather than a strictly
"correct" one, but that's a question of taste and economics...
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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