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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd March 2020, 07:54 AM   #1
manninen is offline manninen  Finland
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Default Mannsize. 3.5way active cardioid´ish project

Gear from old steel is real thread has time to go for 2020.

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New idea is to use jbl 3730 mid/high waveguides and 4x12" on front and one 12" on the rear of the box, 4channels active.

height is gonna be 160-180cm

Last edited by manninen; 4th March 2020 at 01:46 PM.
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Old 7th March 2020, 12:45 PM   #2
manninen is offline manninen  Finland
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Being rounding up if waveguides were passive, that releases some channels for bass management.

Today tried end fire system, kind of. delayed front played fullrange and 1m back played to 100hz. 1ms gaps multiple measurements and listening what it does.

if i hook speakers front and back it might be only 30cm between voicecoils.

yeah i have to think about it all
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Old 7th March 2020, 05:20 PM   #3
ErnieM is online now ErnieM  United States
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I've thought about using the same waveguides. The price is right and the performance looks excellent. Could probably use some damping material to get the best out of them.
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Old 7th March 2020, 05:33 PM   #4
manninen is offline manninen  Finland
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I have bitum on midhorns back, i might use stp black gold on high guide. High guide is not yet on that simulation. i´ll bet those polars is PIA to measure indoors, can´t go outdoors cause it´s freezing outside. speakers this size what is even correct way to measure?
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Old 7th March 2020, 09:55 PM   #5
Zvu is offline Zvu  Serbia
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Suspend it on a crane facing the floor and lift it up at least 5m. Put the mic in the ground with only tip being out. Measure.
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Old 8th March 2020, 07:05 AM   #6
manninen is offline manninen  Finland
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Yes there are many levels in diy audio.
It would be cheaper to rent anechoic chamber and pay for some one for exact measure.
Or put that money to room acoustic and do it like allways.
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Old 8th March 2020, 08:27 AM   #7
Juhazi is offline Juhazi  Finland
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I once made an indoor test with cardioid bass system. Two boxed woofers back to back and minidsp variable delay. By theory this kind of system has only narrow band for cardioid response, because of physical separation of sources.

Indoor measurements didn't give me much reasonable. So, go outdoors! Bass close to front wall or in-wall is very good but room modes are always there!
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Old 8th March 2020, 09:17 AM   #8
manninen is offline manninen  Finland
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No matter is it outdoor or indoors im gonna measure to simulated listening spot.

Might end up using that rear 12" as infra, my lowest fir xo is 62.5hz

Last edited by manninen; 8th March 2020 at 09:23 AM.
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Old 8th March 2020, 11:00 AM   #9
Zvu is offline Zvu  Serbia
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It all depends on level of precision that you want to achieve. Of course measurements can be done indoors too. It takes a little (or a lot) longer to get things right but it's not impossible.

Outdoor measuring is not expensive, it's just a bit complicated becuse it demands that everything is battery powered. Other than that i keep geting the cleanest and most resolving results outdoors. With anechoic chambers there are always problems with lower end of the spectrum. They are great for distortion measurements and all other types of measurements where the climate is/can be harsh.
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Old 9th March 2020, 09:49 AM   #10
manninen is offline manninen  Finland
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can this be simulated versus straight baffle? On straight baffle there not seems to be lobing problems on 400hz x-over
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