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Old 3rd February 2006, 07:52 AM   #1
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Join Date: Jan 2006
Location: Redmond, WA
Default doing a line array of 10x2" drivers

hi, forgive me, im new to diyaudio.com and audio itself. i've only had a few months of experience. i searched for a good while and i cannot find the answer to my question anywhere else in the forums.

currently, i am interested in building a line array. i want the speaker to reach a low of at least 70hz.

my question is:

with equalization, is the distortion split between the speakers, eg. if i find that my speakers have a 25dB reduction in gain at 70hz, does that mean if i have 10 drivers (for instance) and i equalize accordingly so it doesn't drop below -dB, will it have only 1/10th the distortion as if i did the same with one driver in a box 1/10th the size?
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Old 3rd February 2006, 09:11 AM   #2
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

the maximum acoustic output of ten drivers is surprisingly not ten times more.

It is in fact dependent on the square of the number of drivers.
This is because total power handling increases ten times and total
efficiency increases by 3dB for every power of 2 increase in drivers.

So 8 drivers have +9dB power handling and +9dB efficiency yielding
+18dB in maximum output capapability, i.e. they will play 18dB louder.

Your question is somewhat academic for a 2" driver, as on its own
if linkwitz transformed flat to 70Hz, the output capability is pathetic.
You can't compare a driver in gross overload to ones that aren't.

Also note ten 2" drivers have less cone area than a 5" unit, so they
would need decent excursion capability, most don't. A 5" unit with
limited excursion is not surprisingly limited in bass output level.

/sreten.

http://www.zaphaudio.com/

check out the driver info here
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Old 3rd February 2006, 04:29 PM   #3
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Join Date: Jan 2006
Location: Redmond, WA
Thanks for your help! That summed up a load of searching.
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