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Multi-Way Conventional loudspeakers with crossovers

LX mini quest
LX mini quest
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Old 17th December 2017, 09:10 AM   #11
gin8330 is offline gin8330  Denmark
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Hej ven,
I can`t do that ...use the same xo/eq filters as Mr. Linkwitz' because he is using different drivers for his design,but....I have original xo/eq filters ( no miracle in those).
But my Xover has the same`ish cross point. Same times I'm enjoying 400 Hz crosspoint for drivers. Mr. Linkwitz' is genius to use full range driver and that makes all differences.

Last edited by gin8330; 17th December 2017 at 09:14 AM.
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Old 17th December 2017, 09:10 AM   #12
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by gin8330 View Post
Does any one have tray such woofer configurations ( like in a drawing) ?
Wiring in phase and out of phase ?
How it affects sound ,specially out of phase wiring ?
I have used in phase wiring with back to back woofers and it gives force cancellation. If they were wired out of phase I would imagine you would get some kind of a vertical dipole effect and so some 360 degree cancellation. It would be simple and interesting to try both ways and tell us your results.
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Old 17th December 2017, 09:28 AM   #13
gin8330 is offline gin8330  Denmark
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Thanks scottjoplin,
Agree would be really interesting. Same how out of phase configuration makes me think about pipe volume as well ...volume at least will increase as one drivers Sd.
I don't remember where I red, but same one with such configuration ended up with half of speakers volume needed for driver.
Drivers are same how helping each other do a job as well .
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Last edited by gin8330; 17th December 2017 at 09:37 AM.
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Old 17th December 2017, 10:02 AM   #14
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by gin8330 View Post
I don't remember where I red, but same one with such configuration ended up with half of speakers volume needed for driver.
That sounds like you are describing an isobaric configuration, in my opinion the halving of the volume is the only real advantage of that
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Old 17th December 2017, 01:38 PM   #15
DonVK is online now DonVK  Canada
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Quote:
Originally Posted by gin8330 View Post
And know is time for complete LXmini quest with all your help and advise.
I have laid hand on huge PVC pipes O.D. 315 mm.

Volume it can be from 49 to 66 liters and can accommodate 12.00’’ driver easily.

Mine plan is :
  • Incorporate Zobel network for woofer
  • Can be used 2 woofers in same pipe.
  • Woofer choice is Eminence BETA-12A-2 (good spec,reasonable price)

I'm assuming this is a subwoofer design, so you don't need a Zobel comp as the freq will always be very low and limited range.

What freq range are you expecting to cover (ie. 30-120Hz) ??

Why 2 drivers in a single pipe?

Last edited by DonVK; 17th December 2017 at 01:41 PM. Reason: clarify
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Old 17th December 2017, 02:05 PM   #16
scottjoplin is offline scottjoplin  Wales
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I thought that, I asked him earlier, he said no, it's not a sub
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Old 17th December 2017, 02:13 PM   #17
DonVK is online now DonVK  Canada
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OK thanks, I missed that one.
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Old 17th December 2017, 02:34 PM   #18
gin8330 is offline gin8330  Denmark
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Thanks guys, with a design (incorporating second mid range woofer ) to the pipe,a goal is to get even more natural and relaxed bass with god musical definition of musical instruments...
to charge and move more air....I would describe as a "musical" bass (not a booming bass for car stereo) but bass where you can hear musician touching contrabass string.
At the same time would like to find physical drivers limit ( mine opinion is 12 ") where driver will reproduce musical instruments with minimum colouration.
Lets say one woofer will do 30 - 120 Hz range ( simple 1 order crossover) and second woofer do 120 - 1500 Hz range.
To make job easy for amplifiers incorporate Zobel network . I think BETA-12A-2 driver will benefit a lot from it.
All that is only mine thoughts and not based on practical experience.
Main reason behind starting this thread is to get practical experience from you. I'm sure same one was playing with such speaker configuration.

If I personally must choose subwoofer deferentially is will be RIPOL design.
Actually going build one after all festivity in a new year.
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Last edited by gin8330; 17th December 2017 at 02:57 PM.
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Old 17th December 2017, 03:08 PM   #19
gin8330 is offline gin8330  Denmark
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Thank you scottjoplin,
You right that driver configuration is called an isobaric configuration and benefits of that is there. And those are really small potato in speaker design. Thanks
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Old 17th December 2017, 03:27 PM   #20
DonVK is online now DonVK  Canada
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If you want good bass you need to go down to 40Hz.

Why not have 2 chambers in your main 12" pipe. The top chamber would have your 8" woofer (>120Hz) and the bottom chamber has your 12" woofer (40-120Hz). You could make the bottom chamber a BassReflex or Bandpass. The low freq is omnidirectional anyways. SonoTube and SewerPipe BP6 Subwoofer

Alternatively, even with a single 12" you could get 40-400Hz and let the FullRange take >400Hz, keeping it a 2way system.

Last edited by DonVK; 17th December 2017 at 03:34 PM. Reason: full range added
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