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MLTL for dual Jordan Eikona Drivers
MLTL for dual Jordan Eikona Drivers
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Old 7th December 2017, 03:47 PM   #41
colmo is offline colmo  United Kingdom
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Quote:
Originally Posted by Scottmoose View Post
I didn't say 8mm. I said 1in (25mm) acoustic fiberglass or SAE-F10 rated felt. If you stuff it: use the amount specified and adjust as you see fit.
Sorry did not mean that you suggested 8 mm felt.
What I meant was that you suggested felt and that the felt I had seen was 8mm.
If I use f10 25mm felt how much of the internal surfaces should be covered.
What do you think of the rest of my comments questions.
Sorry if offended you in any way.
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Old 7th December 2017, 06:24 PM   #42
Scottmoose is offline Scottmoose  United Kingdom
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No offence assumed or taken. I just have sporadic ability to post.

GM has given some lagging advice; that's what I'd use. Adjust to suit from there.

One observation: there already seems to be a wide baffle, twin driver design on the Jordan site. I don't quite know what 'dual coupled' means, unless 'it's got two vents' but it sounds like it would fit your criteria & is even the correct height, give or take.
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Old 7th December 2017, 07:14 PM   #43
colmo is offline colmo  United Kingdom
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Yes I have seen the design on the Jordan website but it looks like an ordinary reflex design not MLTL and only goes to -3db @50hz whereas the Jim Griffin design is about -3db at 30hz approx.
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Old 7th December 2017, 07:15 PM   #44
planet10 is offline planet10  Canada
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MLTL for dual Jordan Eikona Drivers
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Originally Posted by colmo View Post
Speaker frames 1 in. apart.
Too far apart IMO. I space them 5 mm apart.

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Old 7th December 2017, 07:18 PM   #45
planet10 is offline planet10  Canada
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MLTL for dual Jordan Eikona Drivers
Quote:
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-3db
Keep in mind that -3dB is a number only useful when designing a filtrer, to the human ear/brain it means nothing (Toole). Look at the F6 or F10 when comparing how far down a box goes.

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Old 7th December 2017, 07:18 PM   #46
scottjoplin is offline scottjoplin  Wales
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Let your beautiful Eikonas live and breathe, put them in an open baffle, like what I dun gon un dun
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Old 8th December 2017, 01:16 PM   #47
colmo is offline colmo  United Kingdom
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I will reduce the gap between drivers to 5mm as suggested by Dave.
I am still a little confused about stuffing. If I use 0.5 lbs of Acousta Stuf Polyfill in each cabinet at the top and bring to just below the bottom driver does that sound about right.
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Old 8th December 2017, 05:42 PM   #48
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FWIW, I butt drivers right up against each other except when the desired tweeter won't fit well in the lee [side gap] of a MTM.

Anyway, one more time [last from me], as I noted much earlier, without measurements/tech details of a number of variables it becomes a personal preference issue, especially since the majority of folks that I recommended even very light density [<0.2 ft^3] in untapered MLTLs using MJK's [polyfil] calculator still wound up pulling some/a lot of it out and one even pulled it all, which surprised me no end considering it was a 15" loaded 25 ft^3 MLTL tuned to ~27 Hz makes some seriously audible resonances modulating the diaphragm!; so recommend starting with nothing, then add till it doesn't sound 'hollow' and for most folks you're done, though some prefer a really well damped response to the point of 'dull' for a rare few.

Note too that ideally the ear test needs to be done with the speaker in its final resting place and the 'ear' seated in the 'sweet spot', so could wind up over-damped if done up close in another area.

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Old 8th December 2017, 05:56 PM   #49
Scottmoose is offline Scottmoose  United Kingdom
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After you first gave me a heads up on this, I found the same -most people seemed to want less damping than the theory / measured 'ideal'. I've given up wondering why & just say 'to taste' now as it's one of the 'Y' bits in 'DIY'. Ye tried & trusted click test still seems the favourite test solution. Funny how what worked 60 years or so ago still seems to work now.

Right -I'll get back to munching my treetops.
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Old 8th December 2017, 09:56 PM   #50
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MLTL for dual Jordan Eikona Drivers
Quote:
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FWIW, I butt drivers right up against each other except when the desired tweeter won't fit well in the lee [side gap] of a MTM.
my bold.

In our 1st build of the A12pw MTMs i used as close a spacing as i could, and Chris suggested i push them apart abit more to facilitate building — he had to do a lot of “rasp” work on the midTL to make things fit — another case of easy to draw, hard to build.

Click the image to open in full size.

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