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Old 6th January 2015, 03:14 AM   #1
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Join Date: Jun 2003
Location: Hamilton, was Ottawa (Canada)
Default LXmini 0.67

Why 0.67?

Well, it's got the proper fullrange driver, but not the advanced DSP xo (not shown at website). So that's less than 1/2 but ... more than a 1/4.

And the bass system's just a hack at this first stage, so that's like, pffft ... around 1/5.

"I love the way 2/3 can be expressed as a fraction but can't be simply captured by the decimal system 0.6666666666666"

So rounded to two sig figs ... 0.67 !

...

The LXmini 0.67 is about heading down the LXmini path (or is that rabbit hole!) in ... small steps.


The fullrange SEAS is actually very affordable! It's what pushed this project. I got mine from my French friends at solen.ca



Some of the basic, start-up goodies from the Linkwitz page (spiced up with some of the pics, 'cause I'm visual):

LXmini Challenge

"
... the LXmini will exceed what PLUTO 2.1 had to offer and be a true alternative to the LX521, except for the bigger speaker's extended bass. The low frequency portion of the LXmini's frequency response is similar to the PLUTO's. With a 700 Hz LR2 crossover to a small, full-range and open-baffle driver, and with a diffusing as well as attenuating structure for controlling the rear radiation, the polar response tends towards cardioid behavior and reduces reflections from objects behind the speaker."

LXmini 0.67 Horizontal-front.jpg
LXmini 0.67 Horizontal-rear.jpg

"
... The small, full-range driver on top is superbly smooth and detailed. It blends flawlessly with the pistonic, infinite transmission line woofer for a completely neutral sound in a reverberant room."

LXmini 0.67 short tubes, transducer-mounting-1.jpg

"
... all naturally occurring sounds exist in 3D space and our brain has evolved exquisitely to hear in 3D and not be fooled."


"
... sound propagates in 3D directions and returns to your ears as reflection to be processed by your brain together with the direct sound from the speaker.

The LXmini is designed as a transducer, from electrical voltage IN to 3D acoustic radiation OUT. The most important elements in the design are the drivers and the pipes to which they are mounted and their relative arrangement. Look at it as a two cylinder/piston electro-acoustic motor."

LXmini 0.67 long tubes, brenner-kit-1.jpg



LXmini 0.67, DSP-xo-eq2s.jpg


So looks like you wanna get down to 50ish by using a peak (instead of just boost, so the low freqs roll-off back to normal)

LXmini 0.67, woofer-eq-s.jpg

Sooo, what to use as woofer in a thin, point-source cab that starts to narrow at the 700Hz xo. ???



...



Any advice?


Thanks, Happy New Year and
Cheers,
Jeff

Last edited by Mooly; 6th January 2015 at 12:54 PM. Reason: Correct decimal.
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Old 6th January 2015, 04:02 AM   #2
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Join Date: Jun 2003
Location: Hamilton, was Ottawa (Canada)
Quote:
Originally Posted by AudioLapDance View Post
...


...

Any advice?
...
LXmini ish s.jpg

LXmini 0.67 w alpha10 s.jpg


Last edited by AudioLapDance; 6th January 2015 at 04:08 AM.
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