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Old 21st February 2011, 04:18 PM   #1
Sony is offline Sony  Europe
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Default 4-Way system, initial-design options

I am about to start a new 4-way project based on some drivers I have and other ones I could get.

I was considering one of the next three options (please see picture). From your experience, which one would you choose?

All drivers to be in sealed chamber except for the woofer(s) which are vented (low-side port).


Thanks and regards
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Old 21st February 2011, 06:47 PM   #2
GoranB is offline GoranB  Poland
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Hi Sony,

I think you shoul build a cabinet following the characteristic of your bass and mid-bass driver. I would build a separate cabinets for bass and mid bass.
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Old 21st February 2011, 09:37 PM   #3
Scott L is offline Scott L  United States
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Default Option 1

Based on my experience and your options, I would go with #1.

BUT,

As GoranB suggested, an even better (not listed) option would be to have separate bass/mid bass/ and main array cabinets.
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Old 21st February 2011, 09:40 PM   #4
adason is offline adason  United States
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I would prefer A
but make the mid/heights as open baffle
subwoofer as you wish closed or ported, make it smaller and hide it

B is ok

C is ugly!
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Old 21st February 2011, 11:37 PM   #5
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make it as modular as possible : easier to offset the drivers, and further experimentation allowed
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Old 22nd February 2011, 03:52 PM   #6
Sony is offline Sony  Europe
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Default Take 2

Thank you everyone for the great tips.

I understand the multiple modules motivation, but the Beyma 15B100/R on vented configuration needs a 160 to 190L volume enclosure, making that impracticable. It can be done if used in a sealed box.
- On vented configuration 190L box it's at -3dB at 40Hz; on sealed 100L box it's at -3dB at 55Hz.

Since it is a 97dB unit, sealed is a viable if crossed really low and mid-bass units also work in the sub-bass. I mean, making it a 3.5 way and not 4 way design.

So, under your guidance I got to these 3 new possibilities (see new picture). First one vented 4-way, 2nd and 3rd designs sealed woofer 3.5way.
Design of these last two can be improved. Option 1 has to be a large box to provide space for the 15" woofer in vented configuration.

Please vote.
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Old 22nd February 2011, 06:20 PM   #7
GoranB is offline GoranB  Poland
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I like the design Nr.2

What about crossovers for all these drivers? You should do a lot of math
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