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Multi-Way Conventional loudspeakers with crossovers

Kairos 3-way cabinet
Kairos 3-way cabinet
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Old 13th June 2019, 03:55 AM   #51
LineSource is offline LineSource  United States
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Location: SiliconValley
Quote:
Originally Posted by Mistertaz View Post
Iíve got a few more questions...
1) The optimal time alignment requires a simple measurement. Send a (+) phase sine wave near the crossover frequency to one speaker and a (-) phase sine wave to the other speaker and move one forward-back until a null is heard/ measured.

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
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Old 13th June 2019, 04:07 AM   #52
Mistertaz is offline Mistertaz  Australia
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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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