What are the disadvantages of an MTM array...

454Casull · 4th June 2004, 03:37 AM

... besides narrower vertical dispersion and lobing, if the crossover frequency is too high?

gary f · 4th June 2004, 01:00 PM

Well, there might be another small problem sometimes is that if the 2 woofers are wired in parallel, the impedance can be low (like 3 Ohm or maybe less if you have 6 Ohm woofers). But that is not always a problem.

Also, lobbing is not so bad if you keep drivers close together.

F

SY · 4th June 2004, 01:29 PM

The narrowed vertical dispersion is only a disadvantage if you don't want it. For many applications, it's an advantage. Call it a "characteristic" of the MTM, if you want to be neutral.

The disadvantages are larger cabinet volumes and higher driver costs.

audiosteve · 4th June 2004, 10:54 PM

The talk I read above re narrow dispersion and lobing in an MTM is simply not correct. Minimal lobing on the vertical axis is precisely what an MTM does best (when the crossover is properly designed). The comment re low impedance is spot on though. You have to watch that.

jesper · 5th June 2004, 07:44 PM

About lobing of MTM.
Below is Matlab plots of lobing of a MTM, 2500hz x-over, third order, drivers spaced one wavelegth appart.

jesper · 5th June 2004, 07:48 PM

How do I add multiple pictures?

/Jesper

jesper · 5th June 2004, 07:51 PM

I'll put them in seperate posts.

jesper · 5th June 2004, 08:11 PM

1500hz..

jesper · 5th June 2004, 08:13 PM

2000hz..

jesper · 5th June 2004, 08:14 PM

2500hz..

4th June 2004, 03:37 AM	#1
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	What are the disadvantages of an MTM array... ... besides narrower vertical dispersion and lobing, if the crossover frequency is too high?

4th June 2004, 01:29 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	The narrowed vertical dispersion is only a disadvantage if you don't want it. For many applications, it's an advantage. Call it a "characteristic" of the MTM, if you want to be neutral. The disadvantages are larger cabinet volumes and higher driver costs. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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4th June 2004, 01:00 PM	#2
gary f diyAudio Member Join Date: Aug 2003 Location: Quebec city	Well, there might be another small problem sometimes is that if the 2 woofers are wired in parallel, the impedance can be low (like 3 Ohm or maybe less if you have 6 Ohm woofers). But that is not always a problem. Also, lobbing is not so bad if you keep drivers close together. F

4th June 2004, 10:54 PM	#4
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	The talk I read above re narrow dispersion and lobing in an MTM is simply not correct. Minimal lobing on the vertical axis is precisely what an MTM does best (when the crossover is properly designed). The comment re low impedance is spot on though. You have to watch that.

5th June 2004, 07:48 PM	#6
jesper diyAudio Member Join Date: Jul 2003 Location: Lund	How do I add multiple pictures? /Jesper

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