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Multi-Way Conventional loudspeakers with crossovers

S. Harsch XO
S. Harsch XO
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Old 18th September 2018, 02:20 PM   #621
mkane77g is offline mkane77g  United States
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Old 18th September 2018, 02:27 PM   #622
mark100 is offline mark100  United States
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Originally Posted by BYRTT View Post


Ha ha you good, if time doesn't matter well we talk about mS seconds here to reverse and repair time domain then folks with FIR DSP engines can improve on that point.
Hi BYRTT, ya beat me to it ...yes, what some mS and FIR can do for steeper sloped crossovers...

Here's a 4-way, using 48dB LR's throughout... 18", 12", and 2-way coax CD.
(I use 96 dB LR's now, but only have plots for the 3-way without sub, to show.)

ErnieM, I seem to be in the same boat as you...in needing to keep latency down for live-sound.
As much as I like using steep crossovers, the FIR time needed for phase linearization beyond 24dB/oct slopes is prohibitive. Can do 24 dB linear phase with about 12ms. (I'm also using PLD4.5s ....to drive the 3-way tops.)
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File Type: jpg REW2 4way transfer.jpg (65.9 KB, 106 views)
File Type: jpg REW2 4 way impulse.jpg (63.9 KB, 106 views)
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Old 18th September 2018, 03:41 PM   #623
mkane77g is offline mkane77g  United States
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Old 22nd September 2018, 08:30 PM   #624
ErnieM is offline ErnieM  United States
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Originally Posted by mark100 View Post
Hi BYRTT, ya beat me to it ...yes, what some mS and FIR can do for steeper sloped crossovers...

Here's a 4-way, using 48dB LR's throughout... 18", 12", and 2-way coax CD.
(I use 96 dB LR's now, but only have plots for the 3-way without sub, to show.)

ErnieM, I seem to be in the same boat as you...in needing to keep latency down for live-sound.
As much as I like using steep crossovers, the FIR time needed for phase linearization beyond 24dB/oct slopes is prohibitive. Can do 24 dB linear phase with about 12ms. (I'm also using PLD4.5s ....to drive the 3-way tops.)
Nice textbook results. Must sound loud and clear as can be with the BMS covering the important stuff.
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Old 22nd September 2018, 08:33 PM   #625
ErnieM is offline ErnieM  United States
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Originally Posted by ErnieM View Post
Three-way with 1x15", 1x6", 1.4" CD through baffle no horn.

Crossovers are LR48 600hz, LR24 600&1.5khz, LR48 1.5khz

While not as pretty as the shallower slopes, it's still much better than typical steep IIR implementations. Resolution is improved over the 24/12/24 setup I was using.

I would like to see if someone can get an even better phase linearity with steep slopes.
Now with Bess48 all around.
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Old 22nd September 2018, 09:09 PM   #626
ErnieM is offline ErnieM  United States
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This is my first semi-linear phase crossover with non-coaxial sources that has nice vertical polars. A quick walk around with the mic stand revealed no major power response dips or peaks. Relatively close spacing and steep slopes helps a lot.

This is turning out to be a lower compromise project than I was aiming for. Quite happy with the audible results I'm getting. Overkill for a bass guitar amp? Yup. Though it sounds lovely with anything put through it.

Edit: For a mono system I prefer wide dispersion point sources, hence the hornless compression driver. Going for spacious sound over tight pattern control.

Last edited by ErnieM; 22nd September 2018 at 09:14 PM.
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