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Still learning... I'm trying to button up all the pieces before I go farther; didn't realize offset mounting is handled a bit differently. am I modeling this correctly?
Driver is a JBL 2220h. I have drawn a quick schematic of the proposed horn throat and driver mounting.
- driver mounted to a 3/4" baffle, circular cutout matching cone diameter. That sets the Atc at 890, total Vtc is 3350 (cutout plus estimated driver front volume)
- throat chamber/port is 24cm diameter, 3/4" board (Lp=1.8), Ap1 = 450
- distance from driver center to S1 is 12cm (half of above Ap1 diameter).
- S1 height 6.2cm, S2 height 7.05cm
- purple line is signal path, starting at cone center
any and all comments and criticisms welcome!
Back for a bit again. Ignore me if you like.
Follow Ups:
It looks about right. The notch is where the input to the throat on the left and right sides are 180 degrees out of phase. So long as it occurs above the intended passband it doesn't matter. I use driver offset in my subs as it doesn't have any effect in the sub passband. I never use it in midbass horns.
Thanks! I'll likely build a folded front horn, but I'm glad I took a detour to better understand how the offset driver works.
Back for a bit again. Ignore me if you like.
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