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Multi-Way Conventional loudspeakers with crossovers

LX mini quest
LX mini quest
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Old 16th December 2017, 10:25 PM   #1
gin8330 is offline gin8330  Denmark
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Default LX mini quest

Would like to share my recent toys with all of you.

Speakers are based entirely on Mr. S.Linkwitz LXmini speakers design and all royalty's belong to him.

Reading on a web a god bunch energetically charged reviews and even leaving Don Keele`s masterpiece in a dust .

I decided to build a pair of LX mini`s and take a look closer to that original Mr. Linkwitz design.
The first build of LXmini`s was with in mine opinion improved drivers - woofer is Dayton Audio 6" reference paper woofer RS150P4 and full range is Markaudio Alpair 5.

Don't get me wrong it is a huge amount of beautiful things about that design and most of them way above average, but…..6 inch woofer just can't do it ...it is just not enough space in those drivers for musical instruments. Real woofers with such driver configuration is just a must.

Second version was more grown up ...woofer - Philips AD8066-W4-8 inch and speakers pipe volume has changed from 8 liters to 25 liters, full range driver is Markaudio Alpair 7A Gen. 3A.

And what a difference it was !!! Sound became relaxed and natural, sound stage huge, live recordings became a live, no one was “raping” violins and cellos any more .

It is enough bass to shake glass in windows frame.

It is possible to live with such speaker configuration happily ever after but….. It is a lots to ask from one driver to behave nicely and in civilised manner from 30 Hz to 700 Hz alone.
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File Type: jpg IMG_0147.JPG (850.8 KB, 1282 views)
File Type: jpg Rew.jpg (41.4 KB, 1319 views)
File Type: jpg IMG_0153.jpg (203.9 KB, 1305 views)
File Type: jpg IMG_0156.JPG (905.3 KB, 1249 views)
File Type: jpg Rew1.jpg (41.8 KB, 430 views)

Last edited by gin8330; 17th December 2017 at 07:23 AM.
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Old 16th December 2017, 10:35 PM   #2
gin8330 is offline gin8330  Denmark
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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)
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Old 16th December 2017, 10:46 PM   #3
scottjoplin is offline scottjoplin  Wales
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Is the plan to use that as a sub or stick with 2-way?
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Old 17th December 2017, 12:25 AM   #4
ewollowe is offline ewollowe  Australia
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Always like seeing someone playing around with Lxmini inspired stuff. Good work.

What electronics are you using?
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Old 17th December 2017, 12:52 AM   #5
DonVK is offline DonVK  Canada
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I have a few questions about your LXmini with either 6" or 8" woofer. I use an 8" Silverflute woofer in an Omni design.

The FR graphs are too coarse to see whats going on. They are 50db/div and its easier to see whats happening with 5db/div. I'm assuming the measurement is at 1m.

How are you doing the XO and EQ ?

What did you stuff the woofer pipe with, typically there would be a standing wave or resonance in a long chamber behind a driver ?

Last edited by DonVK; 17th December 2017 at 12:53 AM. Reason: typo
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Old 17th December 2017, 06:15 AM   #6
gin8330 is offline gin8330  Denmark
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To do 3 way it would be easy, just make Ripol subwoofer and that would be it. I would like complete exhaust 2 way LXmini design.
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Old 17th December 2017, 06:24 AM   #7
gin8330 is offline gin8330  Denmark
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Electronics set up:
1.Fostex HP-A4 for DAC
2.miniDSP 2x4 HD for filter
3.2x AMS0100 by Anaview as amps.
Sound source -CD,DVD, but mainly Laptop.
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Old 17th December 2017, 06:56 AM   #8
gin8330 is offline gin8330  Denmark
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Dear DonVK,
Mine mic is not the best in a world but does same ruff job witch is god enough what our ears can hear, mic is UMIK-1 by minidsp. 1/12 smoothing represents that mic pretty god for getting same understanding. But not even best measurement in a world with the best mic. in the world will represent ...how it sounds .
I do XO and EQ like this:
1. Take a speaker reading from 1 m using REW. Letting REW generate first EQ.
2. Take a speaker reading one more time ( with first EQ imported to minidsp) and result send to re Phase software and make corrections with it.
3. Import re Phase results to miniDSP FIR filter.
4. Erase first EQ and take a reading and again with REW and generate second set EQ.
After all that you should be god to go.

Pipe stuffing.....I have used Hawaphon sound insulation panels glued to PVC pipe and later polyester wool damping MDM-4. Self physical pipe size (length) will not allow for
standing wave to form...pipe is just not long enough.

Last edited by gin8330; 17th December 2017 at 07:06 AM. Reason: mistakes
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Old 17th December 2017, 07:01 AM   #9
gin8330 is offline gin8330  Denmark
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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 ?
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Old 17th December 2017, 09:01 AM   #10
Klarskov is offline Klarskov  Denmark
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Hi gin8330

- interesting! Did you use the same xo/eq filter as Linkwitz' original...?
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