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Multi-Way Conventional loudspeakers with crossovers

Slot loaded midbass & dispersion
Slot loaded midbass & dispersion
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Old 28th November 2012, 01:12 PM   #1
OllBoll is offline OllBoll  Sweden
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Default Slot loaded midbass & dispersion

Hello there,

I'm planning to build a 3-way upwards firing omni. up to 300 hz will be handled by a 10'' driver which makes me think: would cone sag possibly become a problem in the long run?

So to avoid that I though of the possibility to mount the woofer sideways and mount it in a slot instead, like in this picture: Slot loaded midbass & dispersion-dsc_0060-jpg

I still want as good dispersion as if it was mounted upwards or good enough such that it doesn't matter, and so the question is if slot loading would achieve this or if there are lots of issues?

Thanks in advance
Olle
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Old 28th November 2012, 02:50 PM   #2
weltersys is online now weltersys  United States
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Slot loading will widen the dispersion in the thin dimension, and will be about the same as the piston diameter dictates in the long dimension.
It will also add a resonant peak and dip.
As a guess, the peak and dip would be in the 250-400 Hz range with the plenum you sketched.
You can model in Hornresp to find whether the peak/dip will be a problem with your chosen crossover.

Art
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Old 28th November 2012, 11:33 PM   #3
CLS is offline CLS  Taiwan
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Mpl

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Old 28th November 2012, 11:49 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Your over complicating something very simple, just point
the driver forwards, it will be near omni up to 300Hz.

Better still is two drivers fore and aft, or left and right,
to give force reaction cancelling in the bass region.

rgds, sreten.
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