Archived from groups: alt.audio.pro.live-sound,rec.audio.pro (
More info?)
Particle Salad wrote:
[bose stick thingies]
> Anyway, the question.... it seems like it wouldn't be difficult
> at all to roll your own similar system.
I wonder.
> It seems to me there are a few of things
> going on here that make the system work:
1) The DSP and its programming.
2) Line array acoustics.
3) Probable reduction in cabinet resonances and flexing due to
relatively small size of cabinets.
> - smaller diameter drivers in the mains so no low mid
> muddiness buildup (the usual bose lack of lower mids)
Explanation is a few miles short of any acoustic merit. Low midrange
problems with large (15" or 12") bass loudspeakers are generally caused
by:
a) improper eq or none at all of unit in x-over
b) lack of internal reflection damping in cabinet
c) cabinet wall flexing and resonance
> - wide dispersion of audio from drivers to make monitors
> unnecessary
Comes for free with all versions of "the Dead Concept", this is a
variation thereof.
> - some sort of feedback reduction in each unit
Dunno, if so, covered by "DSP and its programming" above.
> - omnidirectional nature of bass frequencies
Please stop assuming that it is omnidirectional because it is bass.
Omnidirectionality depends on the relationship between wavelength of
produced sound and cabinet or array front dimensions. This is what
causes the baffle diffraction step frequency response anomaly that all
loudspeaker and loudspeaker stack designs have to consider. See also the
wings on the old cinema horns ... they were there for a very good
reason.
> Thoughts? Has anyone thought of doing their own similar
> system, using some aspects of the Bose system and improving
> on them?
No.
> Is there more voodoo going on then I'm aware of?
I haven't heard it, I can't fairly comment. It appears to be a high tech
approach rather than a simplistic one. Both strategies have each their
own set of merits and "issues".
If you want to obtain similar functionality then selecting a simplistic
low tech route must come to mind, SLS is one of the brands that offer
"something 8 inch", there are other small boxes on the market from other
companies, using a prefab small box is probably simplest.
Kind regards
Peter Larsen
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