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BMR floor to ceiling straight full range driver array.
BMR floor to ceiling straight full range driver array.
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Old 11th August 2017, 02:47 PM   #1
bushmeister is offline bushmeister
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Default BMR floor to ceiling straight full range driver array.

Hi chaps,

So I guess I need a sanity check from you sensible folks. I have built a few different speakers over the years, from very basic ones to quite complex ones. I have synergy horns, full range driver speakers, complex 4 ways active speakers.........but........

I have never built a line array.
I have been very interested in the TC9 builds - obviously Wesayso's build thread being a great source of inspiration to many - but as usual, would like to do something a little different.

My first thought was to use TC9s again as this is a well trod and successful recipe, but then I got a little fixated with the:

TEBM35C10-4
http://docs-europe.electrocomponents...6b815b6e2c.pdf

You can pick them up in bulk for about 6.23 so 36 per side for a total of 72 is about 500 all in....

Measurements can be seen here:
Tectonic Elements TEBM35C10-4 Miniature BMR(R) Driver | Medley's Musings

My thoughts are - would their incredible dispersion characteristics be a good thing, or a bad thing? i.e. does the fact that the TC9 start to beam at higher frequencies actually help mitigate comb filtering? Or is the dispersion a good thing?

Secondly.
Has anyone done a full range driver open baffle line array? I know that the bipolar losses would mean a 50cm wide baffle would probably only get the array down to 150 hz or so - even with some boost, but this is almost to schroeder frequency, so could then be handed over to distributed subs or some other lower freq plan.

I just seem to have a slight obsession with seeing 25-30 full range drivers in an open baffle configuration - perhaps an aluminum central strip to mount them into with perspex 'wings'.......

Thoughts.

Last edited by bushmeister; 11th August 2017 at 03:29 PM.
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Old 11th August 2017, 03:02 PM   #2
Mayuri is offline Mayuri  Finland
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Do it! I'll probably follow suit with something similar, since you gave me inspiration by your sphere built as well

Seriously though, this size of driver lets you get away with only minimal high frequency attenuation. Not sure about the comb filtering. Maybe order 2 and do a test?
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Old 11th August 2017, 03:47 PM   #3
perceval is offline perceval  Taiwan
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There were a few people doing line arrays open baffle, a small Google search picks some of the experiments: open baffle line array - Google Search

I have always been interested in this project, open baffle line arrays, as I really liked my attempt at a line array setup, and I really like the sound from open baffle. Seemed a logical step for me to combine the two.

I remember seeing a BMR before, but I guess it was not the same unit as the one I saw had a huge chasm at 2-3kHz, if I remember well...

I believe the wide dispersion pattern will actually help counteract the combing associated with line arrays.

So, should you consider building this, i would sure follow your progress with excitement, knowing your attention to detail from your synergy thread.

It would be a great thing to be able to compare synergy to line array, since you have both, and I know Wesayso would be quite interested as well!

Good luck!
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Old 11th August 2017, 03:58 PM   #4
theAnonymous1 is offline theAnonymous1  United States
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Why did you have to remind me that I have 24 "NSB" drivers sitting with 12 years of dust on the box along with a few dozen silk dome tweeters. I really need to get rid of them; it's painfully obvious at this point that I'll never put them to use.
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Old 12th August 2017, 08:33 AM   #5
wesayso is offline wesayso  Netherlands
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Ah, a bushmeister line array project

I don't get the attraction of an OB version though, unless you have the opertunity for huge space behind the arrays.

As is, sealed line arrays can work with the room with some simple means. It might give you something extra for orchestral music, but that's not my main interest.

How much room do you plan on having behind the arrays?
With lots of space to play with even a CBT type array might be interesting. Use frequency dependent shading instead of shading all drivers...
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Old 12th August 2017, 12:26 PM   #6
DMLBES is offline DMLBES
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Dayton Audio Epique CBT24K Line Array Speakers at AXPONA 2017 - YouTube

Line Array speaker kit at P.E.
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Old 12th August 2017, 05:15 PM   #7
borispm is offline borispm  Hong Kong
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Those tiny BMRs look very good on paper, especially the incredible off-axis response. Wondering if a line array worsens the off-axis response though...
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Old 12th August 2017, 05:36 PM   #8
TBTL is offline TBTL  Germany
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Assuming a vertical array, the wider dispersion at higher frequencies of course is a good thing for horizontal dispersion. However, for vertical dispersion it might be bad. Ideally you want a continuous 'cone' from end to end of the line. Traditional stiff-coned drivers with small baskets placed close together somewhat approximate that ideal case. Bending mode radiators behave more like point sources, so you would end up with an array of 36 point sources spaced 53 mm apart.

Horizontal dispersion should not be affected by vertical arraying.

Last edited by TBTL; 12th August 2017 at 05:39 PM.
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Old 13th August 2017, 08:06 AM   #9
fluid is online now fluid  Australia
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I thought about my line array for a long time before I built them and did a lot of research on alternatives, as like you I like to add my own stamp on things if possible. I could have bought any driver (within reason) but I decided on the TC9.

The small size of that BMR driver is a benefit in that the CTC can be kept down pushing the combing to a higher point, even though the combing is all but inaudible at any reasonable listening distance with music.

What I like less is the uneven directivity above 3k, as shown in those measurements.

BMR drivers seem like very good candidates but there aren't very many to chose from. Also I think that driver did not do so well in one of XRK971's blind driver tests but I could be remembering wrong. Maybe get one yourself to listen to before committing. If you don't like the sound of 1, 36 won't be any better

If you make it open baffle you will also get dipole directivity, nulls to left and right, that has it's advantages but kills the very wide horizontal directivity of the BMR driver.

There is a lot to like about dipole systems and I have two myself, for me the extra sound to the rear does need to be controlled or a large enough space behind, otherwise it does create a more reverberant sound which enhances some music and muddies others.

Do not discount the height and "bendiness" of structures in excess of 2m tall. It doesn't seem so bad in pictures or when on the ground, then you stand it up...

A bushmeister line array would be a cool project to watch so I hope you go through with it whichever way you choose
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Old 13th August 2017, 09:36 AM   #10
wesayso is offline wesayso  Netherlands
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I think boring was an often heard verdict on that BMR. That usually gets my attention . A non boring driver often has more than I like in its FR. Can't remember the graphs or IR. I think I remember the TC9 being cleaner up top. With the SS 10F as the clear winner for me. Just not for array duty.
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