|13th June 2019, 03:55 AM||#51|
Join Date: Sep 2003
2) For each 3-way speaker, how many dsp channels and how many amplifiers will you have?
With 3-dsp and 3-amps you can time align and equalize each of the 3-speakers(ranges). Build a flat baffle cabinet with large edge rounds(bevels).
With 2-dsp and 2-amps you can time align and equalize the woofer, and use the second amp to simplify the passive midrange crossover -BUT- you will need either the time+phase corrected Kairos passive crossover circuits with a 13-degree slanted baffle, or the Aldephos crossover circuits with a flat/vertical baffle.
3) There are benefits to building a pair of high quality 3-ways with -F3 ~30Hz to generate an optimal stereo soundstage. Later, you have the option of building and locating one or two subwoofer where it both smooths bass room modes and generates 20-40Hz deep bass.
a) Stereo bass down to 20Hz has been produced in low distortion, high SPL since 1982 on CDs, DVD-As, SACDs, and 5.1 movies.
b) Most people with normal hearing can identify the difference between stereo vs. mono bass. Stereo bass has phase for location.
c) At frequencies below 80Hz most people with normal hearing cannot isolate the physical location of the woofer.
-----Expert listeners can isolate location of woofers down to 60Hz by focusing on impact harmonics, port noise, upper harmonic distortion.
d) Not being able to locate the subwoofer is a good cost simplification, but summing low bass into mono degrades true stereo recordings.
e) With stereo woofers & subwoofers, any out-of-phase bass information in a true stereo (acoustic) recording is reproduced properly at full level, adding immensely to the perceived width and depth of the room in which the recording was made.
4) A double thick baffle is often used with edge round/bevels are cut. As long as you adequately chamfer out space behind the drivers
|13th June 2019, 04:07 AM||#52|
Join Date: May 2008
Thanks so much for the advice! I’ll post again when I find time to get started on the project! Hopefully someone else finds this information useful too.
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