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Multi-Way Conventional loudspeakers with crossovers

15 Inch 3 way
15 Inch 3 way
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Old 7th February 2018, 10:50 AM   #1
Mihai Cimpoeru is offline Mihai Cimpoeru  Romania
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Default 15 Inch 3 way

Hello,

I want to make a large 3 way using professional drivers.
These speakers will be used for home audio and will be powered by a Class D Iraudamp DIY amplifier ( made by a friend).

Midbas from 55hz to 400hz range i will be using B&C 15NDL88
B&C Speakers

For mid from 400hz to 2000hz i will be using B&C 8PE21
B&C Speakers

And from 2000-18 000hz i will be using B&C DE250+ B&C ME20
B&C Speakers
B&C Speakers

The enclosure is about 85 liters tuned to 45 hz.

I know that DE250 is a verry good driver but i never saw any measurements with ME20 horn. Has anyone used this configuration?
The same for 8PE21, i didn't find any reviews about this driver and o chose it for it's hi spl and liniar response.

If you have any recommendations or advice on the drivers i am here to listen.

Best regards.
Mihai
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Old 7th February 2018, 01:35 PM   #2
lsiberian is offline lsiberian  United States
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Typically a 3-way would have a midrange that doesn't get crossed at 2000hz because that is in the middle of the human voice band. I suggest looking for a driver that goes a little higher. I'm not familiar with the specific drivers you are looking at, but nowadays with active crossovers so cheap there is a lot more freedom in driver selection IMO.
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Old 7th February 2018, 01:40 PM   #3
globalplayer is offline globalplayer  Germany
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I would go 300-3000 on the mid or maybe use different speakers altogether.
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Old 7th February 2018, 02:11 PM   #4
Mihai Cimpoeru is offline Mihai Cimpoeru  Romania
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Can you recommend me another midrange?

The crossover will be passive, and for eq (if needed) i will be using DCX2496.
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Old 7th February 2018, 06:42 PM   #5
globalplayer is offline globalplayer  Germany
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FaitalPRO | LF Loudspeakers | 6FE200
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Old 7th February 2018, 06:55 PM   #6
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by Mihai Cimpoeru View Post
Can you recommend me another midrange?

The crossover will be passive, and for eq (if needed) i will be using DCX2496.
Because you have dcx2496 go all active 3 way. This way you can try out unlimited crossover points. This is what i always do when i try to build my own speakers. If i have found the ideal crossover points then i try to build a passive filter.

Why 3way? woofer and tweeter will do the job.

Last edited by Koifarm; 7th February 2018 at 07:00 PM.
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Old 7th February 2018, 07:20 PM   #7
lsiberian is offline lsiberian  United States
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I personally use two Dayton Dome Midranges for my 3-way build.

Other excellent options includes the NEO drivers, some of the Full Rangers would make excellent midrange drivers too. I'd classify any speaker with at least a range from 500 hz to 4khz. Price doesn't equate quality either so I suggest you look around and see what other folks have used with success.
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Old 7th February 2018, 07:28 PM   #8
lsiberian is offline lsiberian  United States
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Quote:
Originally Posted by Koifarm View Post
Why 3way? woofer and tweeter will do the job.
In theory a 3-way allows the designer to maximize performance by having crossovers outside of the human voice band. FWIW Many of the best speakers in the world employ a 3-way design. I admit I've never personally compared 2-ways to the 2-ways. I'm a hobbyist designer with a limited budget and limited time.
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Old 7th February 2018, 09:04 PM   #9
DougL is offline DougL  United States
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If it were my project, I would be tempted to use a 6" B&C midrange.
I would cross it wherever the radiation angle matches your horn.
I believe that's about 2 kHz for 90 degree for a 6 inch and 1.4 kHz for an 8 inch.
IMHO, there is no perfect crossover point.
I do like 3 ways. The problem is you need to compromise either high frequency directivity with a larger mid, or efficiency or max SPL for a small midrange.
Even with the compromises, 3 way speakers can be stunning.

I would do my initial testing using an AV amplifier and the digital crossover.
Warning, you may never go back to passive.

Good luck with your build.
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Old 8th February 2018, 01:22 AM   #10
LineSource is offline LineSource  United States
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Looks like a good selection for high efficiency, with limited bass(-F3 ~55Hz). The 8PE21 should match the 90H polar of the ME20 horn between 1800 and 2000Hz, but look for polar measurements to comfirm this. Both the ME20 and 8PE21 are 3.6" deep, and you may be able to get acceptable time alignment from phase shift differences with the proper crossover circuits.

With Fs=87Hz and Qtc=0.19, the B&C 8PE21 sims to -F3=350Hz in a sealed 0.1cuft volume with Qtc=0.47 and sensitivity near 98db.
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I have seen better driver combinations with the low Le Faital speakers like 10PR410 midrange ... wider bandwidth but at slightly lower efficiency.
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