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I think at the margins things still have an impact - there is no exact frequency where people stop differentiating direct and reflected sound its a smooth transition and I would put 300hz as the beginning of the transition not the end. Like everything in life, you gotta make value judgements in...

The theory behind it is that the more constant the directivity index, the more reflective of the original sound the reverberant field will be - yes you can eq to get a flat frequency response, but you cannot equalize the ratio of direct to reverberant sound - that is the reason you'd want...

Fantastic writeup, thanks for sharing - would you be willing to share some of your code or maybe just pseudo code you used for the optimization?

Between 100-300 I think the advantage is placement near a wall, particularly for nearfield type monitors. Aside from dipoles I'm not aware of any compact solutions for directivity control from 100-200hz. I guess phased arrays like the bang and oleufeson but thats basically just an extension of...

I think a big part of why we don't see more of it is that there aren't a lot of resources on the design of (especially passive) cardioid loudspeakers, combined with the additional resources needed to do directivity measurement, it's something you need to invest quite a bit of time and resources...

I'll post some photos when I'm done with the build, it's definitely very unique - I plan on building a second unit and using them in conjunction with the upper baffle portion of the lx521.4 I've also got a couple ideas I'd like to experiment with, including a concept to increase the chamber...

There is a velocity increase, however there is also a proportional decrease in the effective radiating area with slot loading - the surface that bounds the air at increased velocity is proportionally smaller. What you do get is more cardioid type dispersion, and a small gain in efficiency (over...