Shorter MTM array or larger TM array?

goldyrathore · 3rd November 2010, 01:14 PM

I have a bunch of drivers for a line array and need to make some design decisions.
I mention the design decision cases below, what do you think is better?
Tweeter line is same 3 feet in both the cases. Drivers are 2" or 3" fullranges. Crossover to woofers (not mentioned here) is 180hz and crossover to tweeter is 3500hz.
Listening distance is 6-8ft.

1) A shorter 3 ft mid line + 3 ft tweeter line + 3 feet mid line. Driver placement is better shown here Symmetrica.
2) A longer 6 ft Mid line + 3 ft tweeter line.

What you think is better and why?
I need a good phantom image.

Thanks,
Goldy

sreten · 3rd November 2010, 01:28 PM

Hi,

The longer line should be better for two reasons :
1) less lobing when crossed over to the tweeters.
2) will maintain line dispersion down to a lower frequency for c/o.

Though FWIW there are 2" or 3" drivers that simply do not need tweeters.
e.g. : Humble Homemade Hifi

rgds, sreten.

ewetho · 18th November 2010, 12:17 AM

I made my line with the Tweet array almost the same hight as the Mid array. This helps the imaging of the array. Would not go to double wide cabs on the Mids. One row per cab should sufficient. Wider dispersion with two single columns.

Remember that listening distance of nearly 2 times the line height or more too.

ewetho · 20th November 2010, 11:34 AM

Oops meant to say Wider Dispersion THAN with two single columns.

WR Sugar · 30th November 2011, 08:04 PM

I understand about the dispersion of a single vs. double, but what if you were actually shooting for narrower, more precise imaging? I literally just ordered a bunch of drivers, the NS3-194-16A, Apex .50c mylars and NS525. All inexpensive as they come... so I have enough to make full length lines. I was even thinking about using a melded piezo line from BFM with the 3" drivers. They cross up so high anyway, I figured the piezo might just be a good fit.

3rd November 2010, 01:14 PM	#1
goldyrathore diyAudio Member Join Date: Nov 2002 Location: Bangalore, India	Shorter MTM array or larger TM array? I have a bunch of drivers for a line array and need to make some design decisions. I mention the design decision cases below, what do you think is better? Tweeter line is same 3 feet in both the cases. Drivers are 2" or 3" fullranges. Crossover to woofers (not mentioned here) is 180hz and crossover to tweeter is 3500hz. Listening distance is 6-8ft. 1) A shorter 3 ft mid line + 3 ft tweeter line + 3 feet mid line. Driver placement is better shown here Symmetrica. 2) A longer 6 ft Mid line + 3 ft tweeter line. What you think is better and why? I need a good phantom image. Thanks, Goldy __________________ Audio enthusiast/hobbyist

3rd November 2010, 01:28 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, The longer line should be better for two reasons : 1) less lobing when crossed over to the tweeters. 2) will maintain line dispersion down to a lower frequency for c/o. Though FWIW there are 2" or 3" drivers that simply do not need tweeters. e.g. : Humble Homemade Hifi rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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18th November 2010, 12:17 AM	#3
ewetho diyAudio Member Join Date: Nov 2010	I made my line with the Tweet array almost the same hight as the Mid array. This helps the imaging of the array. Would not go to double wide cabs on the Mids. One row per cab should sufficient. Wider dispersion with two single columns. Remember that listening distance of nearly 2 times the line height or more too.

20th November 2010, 11:34 AM	#4
ewetho diyAudio Member Join Date: Nov 2010	Oops meant to say Wider Dispersion THAN with two single columns.

30th November 2011, 08:04 PM	#5
WR Sugar diyAudio Member Join Date: Aug 2011	I understand about the dispersion of a single vs. double, but what if you were actually shooting for narrower, more precise imaging? I literally just ordered a bunch of drivers, the NS3-194-16A, Apex .50c mylars and NS525. All inexpensive as they come... so I have enough to make full length lines. I was even thinking about using a melded piezo line from BFM with the 3" drivers. They cross up so high anyway, I figured the piezo might just be a good fit.

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