Top midrange drivers for open baffle?

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#101
I did some calculations - if the radiating area matches the area of perforations, then the LM10n could have an Sd of around 150cm2. That's equivalent to a circular driver with a radiating diameter of 5.4 inches. Radian give 1.2mm as the "displacement limit." Entering that into the online piston excursion calculator, with a 220Hz lower limit, suggests a maximum SPL of 103.7dB. Even if that's 6dB down from the passband level, that's an excursion limited maximum of just under 110 dB. And that assumes the 1.2mm excursion limit given is an RMS value, rather than a peak value (which is unlikely), and it ignores the fact that planars don't displace air uniformly as excursion increases (a point that's made nicely in the Consonus Tide technical paper). It also assumes a driver in a sealed box.

So I doubt that a single LM10n on that baffle, crossed at 220 Hz, could manage 114 dB.
 
#102
Here is Tide individual responses, from their brochure that is very informative. Still polar measurements are missing...
XOs 90/250/2200 LR4 acoustic

Tide xo responses.png


And my AINOgradients (indoor) - 10" sub, 12"cone low mid, 8" planar high mid and 3# planar tweeter
XOs 180/800/3500 LR2 acoustic

ainogneo83 2x4hd v33 all ind 20ms 13.jpg
 
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#104
mikessi said:
What does he know that we don't?
Click to expand...
Well, for one, he didn't suspend the drivers on springs. :nownow: They are on a damped stiff, non-resonant, baffle with damping at the edges of the drivers, front and back. Ref: CONSONUS Tide design story and technology, https://cdn.prod.website-files.com/...f293c08e1_ConsonusTideDesignAndTechnology.pdf

Also, the cone drivers are anchored similarly to what Linkwitz proposed here: https://www.linkwitzlab.com/frontiers_2.htm

I've seen similar systems in the 'post yer pictures' and open baffle threads.
 
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