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Old 28th December 2013, 06:58 PM   #1
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Default JE Labs style open baffles

Hello!

I have been playing with the idea to build as simple/minimalistic open baffles as possible (something like JE Labs style with only one FR element).JE Labs: JE Labs Open Baffle redux

I read that some of you have had good experiences with them, but I still need more info to determine if they are suitable for my purposes or not.

MJK style open baffles with 8" TB W8-1808 + 18" woofer is my reference so far:
+++Big, deep soundstage (lots of air between instruments), open realistic mids, suitable for many music genres, also for hard/heavy rock
---Bass quality (tightness, speed), upper mid/top end small colorations

These are my wishes for the new design:

- -6dB point approx 40...45 Hz
- baffle size not bigger than the original design (35"x31")
- must work with rock music also at moderate levels
- listening distance at small room max. 3 m (~10 ft)

Is there any change to succeed?
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Old 28th December 2013, 08:51 PM   #2
mor2bz is offline mor2bz  United States
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don't do it sounds like you have something better already

I made one with a 12" fullrange EV driver (high q for this model) with a tweeter added to the top. Bass was still weak.

The soundstage is too low. I changed the angle of the bottom of the side pieces to lay it back some more but ultimately built the MJK alpha/ 103 OB
Much better . the thing I did not like about the MJK OB was the jump
between octaves on bass instruments between the bottom of the speaker and the top. Bari sax for instance. other than that very smooth and easy to drive.
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Old 29th December 2013, 08:41 AM   #3
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I was thinking to use maybe this kind of element:
Fane International Ltd Loud Speakers
More comments please?
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Old 29th December 2013, 11:14 AM   #4
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I loved B200 from Visaton, but in a bigger baffle, maybe it will work in this size too.
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Old 29th December 2013, 06:29 PM   #5
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I did some modeling by using Tolvan Basta. According to frequency responce there should be decent amount of bass available in 50 Hz. But element location is not optimal, as far as I can understand. Please note that Basta does not take into account room boundary reflections. Only driver properties/location and baffle size/diffraction. Comments?
Attached Files
File Type: pdf Fane 12-250TC in JE Labs OB.pdf (372.9 KB, 37 views)

Last edited by Knight Rider; 29th December 2013 at 06:33 PM.
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Old 30th December 2013, 11:22 AM   #6
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Quote:
Originally Posted by pk2carlos View Post
I loved B200 from Visaton, but in a bigger baffle, maybe it will work in this size too.
Visaton B200 is of course interesting driver and widely used. How big is your baffle? How about bass quality/extension?
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Old 31st December 2013, 04:40 PM   #7
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I had quite big baffle around 140 cm tall and 100 cm wide. I had it in a room 4x4 m and I didnt miss any bass.
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Old 1st January 2014, 11:56 AM   #8
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I got some tips from finnish hifi forum to avoid that JE Labs (Briggs) style baffle. Someone had tested it with 8" Supravox and complained that soundstage was too low. At least when listened in small sized room. Maybe better solution could be a winged (folded) baffle with piano hinges, like wild burro audio Betsys. What you think?
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Old 17th February 2014, 06:51 PM   #9
Elias is offline Elias  Finland
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Hi,

The sound stage is too low because tweeter is aimed to listener. Note that in original Gilbert Briggs baffle there is the separate tweeter aimed to ceiling ! It will lift the sound from the floor.


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Old 19th February 2014, 01:41 AM   #10
xrk971 is offline xrk971  United States
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Try a slot loaded OB - it can get pretty deep bass in a fairly narrow baffle with multiple smaller drivers. Basically, you need at minimum a 15 in high Qts driver to get sufficient bass. You can do it with qnty 6 x 6.5 in drivers, qnty 4 x 8 in drivers, qnty 2 x 12 in drivers, or single 15 inch. The slot loading approach allows drivers to be squeezed in sideways reducing frontal profile.

I was able to reach 30 Hz with 6 x 6.5 inch drivers (Qts about 1).

Cheap and FAST OB, Literally
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