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Multi-Way Conventional loudspeakers with crossovers

Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?
Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?
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Old 12th August 2019, 04:03 AM   #1931
ewollowe is offline ewollowe  Australia
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Tuyen I cut my first 15" holes and put my pair into a very quick OB to play around with yesterday. To be honest I couldn't give you any feedback yet as I'm still getting to grips with the umik/rew set up. Have a minidsphd to get my head around too.
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Old 12th August 2019, 04:08 AM   #1932
tuyen is offline tuyen  Australia
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Good Luck mate! Interested to hear how you get on with it all.
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Old 12th August 2019, 08:17 AM   #1933
Ro808 is offline Ro808  Netherlands
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Congrats!
That's a fine horn/driver combination. In general, you'd cross it north of 1200Hz, but you might get away with 1000Hz.

Last edited by Ro808; 12th August 2019 at 08:25 AM.
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Old 12th August 2019, 09:02 AM   #1934
4real is offline 4real  Netherlands
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Exciting times tuyen! Have fun.

I also have stuff coming my way. I have a pair of Altex 808-8A arriving this week Now I still need to find some matching budget horns .
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Old 12th August 2019, 10:31 AM   #1935
Defo is offline Defo  Norway
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How does one go about matching woofer directivity to these large narrow dispersion horns?

For instance if you were to cross the XT1464 at ~500 Hz you would need an extremely large woofer to match the 50 degree dispersion
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Old 12th August 2019, 10:45 AM   #1936
4real is offline 4real  Netherlands
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Originally Posted by Defo View Post
How does one go about matching woofer directivity to these large narrow dispersion horns?

For instance if you were to cross the XT1464 at ~500 Hz you would need an extremely large woofer to match the 50 degree dispersion
At 500Hz that thing is probably closer to 100 deg. It start loosing pattern control at before 800Hz already.

Personally I'm looking at the PH-3520 right now. It's still on the small side of things, but it 12 euro's, so might be worth a first try..
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Last edited by 4real; 12th August 2019 at 11:11 AM.
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Old 12th August 2019, 05:32 PM   #1937
gedlee is offline gedlee  United States
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Originally Posted by Ro808 View Post
"Arguably, the limiting factor in most prosound loudspeakers is the tweeter. At high frequency, you reach a point where you can't load the tweeter, and then that frequency becomes the limit for the entire loduspeaker.
I've seen this in every one of my designs. The upper end of the tweeter sets the limit of system SPL.

This is why I couldn't use a DE500 in my NS-15. Because the DE500 had a few dB lower output at 10k I could not match it to the higher efficiency 15" woofer. In the NA-12 the match was fine, but not the larger woofer.

However, simple solution arrived. Pad out the woofer instead of the usual tweeter. Not a common solution, but it does work just fine (especially in a closed-box system.)
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Old 12th August 2019, 05:36 PM   #1938
gedlee is offline gedlee  United States
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Originally Posted by Ro808 View Post
The low frequency section is fairly traditional, just a big ol' woofer for high output. The design includes JBL's "RBI" technology. The "RBI" technology is basically designed to widen the beamwidth, as Bill Fitzmaurice correctly observed. The RBI allows you to use a LARGE woofer while attaining the beamwidth of a SMALL woofer.
All techniques of this type will widen the directivity, nothing can really narrow it without a large waveguide. Wider directivity is NOT what I want, so these techniques are not really a solution in that case. Using a very large woofer in my designs is to get narrower directivity, not higher output.
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Old 12th August 2019, 07:06 PM   #1939
Ro808 is offline Ro808  Netherlands
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500Hz XO is on the low side for the XT1464.

Last edited by Ro808; 12th August 2019 at 07:10 PM.
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Old 12th August 2019, 07:56 PM   #1940
Ro808 is offline Ro808  Netherlands
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Originally Posted by gedlee View Post
All techniques of this type will widen the directivity, nothing can really narrow it without a large waveguide. Wider directivity is NOT what I want, so these techniques are not really a solution in that case. Using a very large woofer in my designs is to get narrower directivity, not higher output.

There's no substitute for a big horn.
This also applies to OSWGs, as illustrated by Marcel Batik in the sims below of a 52cm (diameter) OSWG.


Now that he has released his tool to the public, I guess it's permitted to show some sample waveguides.
Attached Images
File Type: png OSWG-3_2_52cm Diameter.png (108.8 KB, 164 views)
File Type: png OSWG-3_SPL_pmap_52cm Diameter.png (42.5 KB, 166 views)
File Type: png OSWG-3_SPL_52cm Diameter.png (31.4 KB, 166 views)
File Type: png 90x70_195.png (195.8 KB, 164 views)
File Type: png SEOS_Clone_2.png (203.3 KB, 164 views)

Last edited by Ro808; 12th August 2019 at 08:04 PM.
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