BSC with open baffle array

[validator]

Hi,

this might be a stupid question but:

I want to build a kind of open baffle line with 8x 4inch widerange driver surrounding a horn tweeter. The baffle is about 6inch wide and 40inch long. Do I need to implement a baffle step correction?

Thanks in advance
Thorsten

[Timn8ter]

I don't think so, but you may want to consider a wider baffle unless you're running a mid-bass array along with it. Your frequency roll off with a 6" wide baffle is going to be very high.

[5th element]

Hmm reading this got me calculating. My OB's are 30cm wide and when measured fall off at about 500hz, but theory says this should occur at about 1000hz? Im confused unless my mathmatics is somewhat flawed this early in the morning.

Anyone care to explain please.

[johninCR]

I don't know the calculations but the graph I use show even lower for a 30cm baffle http://www.angelfire.com/electronic/...oncept-1b.html

5th Element,
You are probably only considering the width, not the height plus the free ride of the floor.

[Rudolf]

Thorsten,

with the "8" radiation pattern of a dipole there is no baffle step - by definition and by function. Did you try http://www.tolvan.com/edge/
to simulate the frequency response and edge diffraction of your OB?
The baffle you are suggesting should support f3~300 Hz, but those 8 drivers might move f3 down a bit.

Rudolf

[5th element]

Hmm my baffles are 30cm wide and the front of the panel is about a meter tall. The rear of the panel is 30cm tall. The panel sits atop a boxed woofer.

[Timn8ter]

Originally posted by 5th element
Hmm reading this got me calculating. My OB's are 30cm wide and when measured fall off at about 500hz, but theory says this should occur at about 1000hz? Im confused unless my mathmatics is somewhat flawed this early in the morning.

Anyone care to explain please.

This topic was about beat to death in another thread. Chances are there is more going on than one equation is going to account for. Your measurements tell the real tale.