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Multi-Way Conventional loudspeakers with crossovers

Zaph|Audio SB12.3, slight redesign
Zaph|Audio SB12.3, slight redesign
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Old 18th December 2017, 03:09 PM   #11
LineSource is offline LineSource  United States
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EXAMPLE: Adding a sealed woofer to a proven 2-way design.
$52 tweet + $58 mid + $175 woofer + $90 crossover parts = $375
The midrange is in a separate 0.5cuft volume(angle rear board) in ATC cabinet.

Google this pdf
The Kairos and Continuum Three-Ways
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File Type: jpg 2way convert 3way.jpg (198.6 KB, 287 views)
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Old 21st December 2017, 07:44 PM   #12
LineSource is offline LineSource  United States
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This baffle diffraction simulation uses similar baffle dimensions to the ATC cabinet with a 1" dome tweeter, 6" midrange, and 12" woofer. This simulation shows benefits from:
1) large quarter-rounds or bevels on the baffle edges
2) carefull placement of the tweeter and midrange heights similar to this baffle model
3) lowest simulated diffraction with: tweeter offset 0.8" and 6" midrange offset 2"
----the ATC engineers also used two different offsets for their 1" tweeter and 3" dome midrange.

Why is this 3-way design interesting? Because it delivers good Qtc=0.7 sealed bass from an acceptable 4cuft cabinet.
--Sealed 4cuft volume for the 12" SB34NRX75-6 delivers -F3 ~35Hz with SPL ~87-88db including a modest baffle step.

1.1" Dome SB29RDC-4
6" Satori MW16P-8 or lower cost SB17NRX35-8
12" woofer SB34NRX75-6
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File Type: jpg ATC diffraction 1x6x12.jpg (222.1 KB, 224 views)
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Old 21st December 2017, 08:53 PM   #13
smithie is offline smithie  United Kingdom
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hi linesource
wow...thanks for all your help and research and sims.
i will get back to you and here when i can get some decent free time,just crazy this end at the moment.
just wanted to let you know im still around,that i appreciate all your time,effort and ideas....and" ill be back"

regards
paul
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Old 23rd December 2017, 09:36 PM   #14
LineSource is offline LineSource  United States
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Some people favor the look of a narrow front baffle, and some room layouts require a narrow speaker cabinet. A 12" woofer can still be used if a deeper cabinet is acceptable. A combination of careful baffle sizing, careful driver placement on the baffle, and using rounded or beveled front baffle edges are all required for reduced diffraction with a tall-and-narrow front baffle.
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File Type: jpg Side Woofer.jpg (97.3 KB, 207 views)
File Type: jpg Tall2 sideWoof.JPG (195.9 KB, 200 views)
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Old 23rd December 2017, 10:21 PM   #15
smithie is offline smithie  United Kingdom
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hi linesource
once again i thank you very much for all your help and response and so sorry for not getting back to you sooner..been manic here.
as your posts have proved....there are so many approaches and ways to achieve the same desired goals.
what i was ultimately after which is what i found in this original posted design kit was something i could build that had every part worked out,well documented with all info and suited my needs and dreams.
the downside was just with the looks of the finished speaker...nothing wrong with it of course,i was just after a slightly different look,a look that was vaguely like a atc speaker scm100 and wondered if it could sort of be achieved without screwing up all the hard work and achievements of the original design.
i think i am still going to go ahead with this idea for now,i've done a few more iffy sketches which hopefully will convey my idea better.
obviously as always i would be grateful if i'm going to screw something up that it gets pointed out to me,along with any problems or flaws that may arise from my subtle tweak of this design
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Old 23rd December 2017, 10:29 PM   #16
smithie is offline smithie  United Kingdom
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what my iffy drawing doesn't show is...
when the original speaker enclosure is slid and mounted inside the bigger outter box 2" of the original speaker baffle will be sticking proud of the new enclosure(atc100 style) and im hoping this will be enough not to upset the original xover design as it will be seeing the original baffle width and the speakers will be positioned as originally designed.
i hope that all makes sense
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Old 26th December 2017, 07:19 PM   #17
LineSource is offline LineSource  United States
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To get the best MTM polar presentation, you new box should have the tweeter at 36"-39" height, or angle the cabinet to the seated location.

The narrow polar pattern of most MTM arrangements favor the tweeter positioned at seated ear level for best sound.
The SB12.3 cabinets are 46" high because Zaph wanted the MTM tweeter to be at ear level (36"-39") .

A TM polar pattern can be slightly angled upward to cover a wider seated + standing height range.
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File Type: jpg Baic Polar Sims.jpg (115.8 KB, 89 views)
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Old 13th March 2018, 09:11 PM   #18
RafMK is offline RafMK  United Kingdom
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Default Side mount woofer

Quote:
Originally Posted by LineSource View Post
EXAMPLE: Adding a sealed woofer to a proven 2-way design.
$52 tweet + $58 mid + $175 woofer + $90 crossover parts = $375
The midrange is in a separate 0.5cuft volume(angle rear board) in ATC cabinet.

Google this pdf
The Kairos and Continuum Three-Ways
Hi LineSource,
I found this post looking for options with Zaph SB12.3, like someone previously said they are ugly so Iím thinking to make some changes to the design like live MTM at the front and put woofer on side but I heard cross-over needs to be modified for that any chance you can help me with that?
I also look at the design proposal in your post and you mentioned that woofer can by mounted on side can you put little more light on this,please
Regards,
Raf
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Old 13th March 2018, 10:43 PM   #19
jtgofish is offline jtgofish
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The Zaph 12.3 really does look a bit bluff.I am sure this has put a lot of people off.
Changing the baffle too much is really asking for trouble however.It seems the driver arrangement and crossovers are very specific to that baffle and positioning.MTM designs are hard enough to get right without messing with a proven formula.
My thoughts are that something that detracts your eyes away from the bluffness might be the best solution.A small shadow line groove or contrasting inlay about 5mm back from the baffle edge round-over might help.Or a mitred contrasting quarter round forming the round-over edge.Better still a contrasting quarter round with a very fine groove on the inside.

For those of us that dislike ported bass this kit seems to have a lot of appeal.
It would also appear to be suited to lower powered amplifiers than most.

Last edited by jtgofish; 13th March 2018 at 10:47 PM.
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Old 13th March 2018, 10:52 PM   #20
jtgofish is offline jtgofish
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Osborn Audio makes speakers that look very much like the Zaph12.3.
They really look a lot better in the flesh than in photos and you can also use the grille frame to make them look less bluff.
Untitled Document
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