can one address poor off axis response if many drivers were used

tech.knockout · 19th May 2006, 02:08 PM

Sorry if these are stupid questions:

If one were to plan to DIY many beamy speakers that are aimed to cover the entire listening area with their limited dispersion; can the poor off axis response of each individual driver be addressed/ignorable without large side effects?

I remember someone posting a picture of a massive altec lansing setup using many drivers which seems to fit this principle. (not a line array, more like a "flower shaped array" where drivers aim at many angles)

Would "comb filtering" be a serious problem in this case, or is comb filtering primarily a crossover overlap problem?

sreten · 19th May 2006, 03:06 PM

Hi,

Its already been done in the case of multicellular horn arrays.

For surface mounted drivers its difficult to avoid combfiltering effects
at frequencies the drivers are not directional and wavelengths are
comparable to driver spacing.

sreten.

Dusty Chalk · 26th May 2006, 08:12 AM

As long as they are time-aligned (both circuitry-wise and mechanically/physically) and they cover the same portion of the frequency spectrum (I.E. crossover, characteristics), I don't see why this would be a problem.

The thing that may happen is that first reflections become a bigger issue, by coming back to interact with a different driver's wavefront out of phase.

One of the E3 speakers uses the following layout to get a point-source: a set of 5 or 7 or I don't remember how many tweeters in a circular array.

I'd be very interested in the answer to this as well, as I am thinking of building an omnidirectional speaker, myself...

19th May 2006, 02:08 PM	#1
tech.knockout diyAudio Member Join Date: Jun 2003 Location: Parra, Sydney	can one address poor off axis response if many drivers were used Sorry if these are stupid questions: If one were to plan to DIY many beamy speakers that are aimed to cover the entire listening area with their limited dispersion; can the poor off axis response of each individual driver be addressed/ignorable without large side effects? I remember someone posting a picture of a massive altec lansing setup using many drivers which seems to fit this principle. (not a line array, more like a "flower shaped array" where drivers aim at many angles) Would "comb filtering" be a serious problem in this case, or is comb filtering primarily a crossover overlap problem?

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19th May 2006, 03:06 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Its already been done in the case of multicellular horn arrays. For surface mounted drivers its difficult to avoid combfiltering effects at frequencies the drivers are not directional and wavelengths are comparable to driver spacing. sreten.

26th May 2006, 08:12 AM	#3
Dusty Chalk diyAudio Member Join Date: May 2006	As long as they are time-aligned (both circuitry-wise and mechanically/physically) and they cover the same portion of the frequency spectrum (I.E. crossover, characteristics), I don't see why this would be a problem. The thing that may happen is that first reflections become a bigger issue, by coming back to interact with a different driver's wavefront out of phase. One of the E3 speakers uses the following layout to get a point-source: a set of 5 or 7 or I don't remember how many tweeters in a circular array. I'd be very interested in the answer to this as well, as I am thinking of building an omnidirectional speaker, myself...

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