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Old 17th January 2015, 07:16 AM   #1
panos1 is offline panos1  Greece
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Default beyma 12ga50

hi..
i want to build a pair of 12 pa speakers...
i saw beyma 12ga50 wich is 12inch and has 102 db senseativity...
i saw it has a wide frequency range 70-16khz...
can i use these driver for pa?
they will play all kind of music and i mostly care about spl and not so much about sound quality...
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Old 17th January 2015, 07:54 AM   #2
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But music goes together with sound ( quality) !
If not ....!?!
Aside from that... ( no, it cannot ! )
Xmax=2mm and Fs=90 Hz means very little bass
But the 50 mm voice coil assembly assures a good power "suction"
With a subwoofer and EQ (for the treble, particularly ) it would produce a good performance, I guess, for PA ( it's what it is for...)
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Old 17th January 2015, 02:23 PM   #3
panos1 is offline panos1  Greece
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the speakers will play with subwoofer...
so you think i should prefer a two way 12 inch speaker?
it will give me lower spl..
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Old 17th January 2015, 04:26 PM   #4
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Or add a horn [super] tweeter such as the CP25 to get sufficient HF off axis output.

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Old 17th January 2015, 05:29 PM   #5
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First, which subwoofer ?
I intended a monster one

I also intend PA as a on the street venue - Walls ahead at almost 10 ft )?=or some trees

The benefit of replicating bass source is that the output is summed_...not the same at treble region where angular...well, it's the same principle that applies to bass as the summing takes vectorial directionality
Wait ! It's the same principle that would lead to abandon a whizzer(ered cone) because of the change of directivity -mechanically induced, moreither
And also the bad reproduction of the very highs is because of the large cone area / sound velocity / with frequency ( wave lenght ) in comparison with a dome or a piezo/comp. driver + horn - sort of some loss of energy being badly dissipated by the wrong driver

Last edited by picowallspeaker; 17th January 2015 at 05:32 PM.
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Old 18th January 2015, 02:57 PM   #6
panos1 is offline panos1  Greece
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one cubo18 subwoofer...
i think this woofer is better http://www.fane-international.com/do...20DS030513.pdf
5mm xmax instead of the 2mm of beyma....
and 50hz fs instead of 90 of beyma...
i think this woofer can play all kinds of music without subwoofer at small gigs...
what do you think?
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Old 19th January 2015, 12:11 PM   #7
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One cubo18 ( if it's the folded horn that I found searching for "cubo18 subwoofer") is not a monster, I guess. Maybe 4 X 10" long throw wooofers
would do better, also Car Audio types. If budget is in restraints, maybe the Fane is Ok ( for 70 ) because to get a decent pair of classic 12"+1" tweeter+horn in enclosure it costs about 500 .
But of course you are limited by the characteristics of the single driver, as GM pointed that simply adding a CP25 tweeter ( but that's about 90 ! then you neet to "cross it over" )would raise the performance.
STill, 3 ways are my preferred and also worlwide way to listen to music.

You could still arrange at best the combination of a subwoofer and a FR, but I'm limited in choice by the very low power cones that I use to try at home, but yes they're light ! And choose a smaller cone - say, a 8", that'll perform well from 200 Hz or so.
Difficult eh ?!?
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Old 19th January 2015, 04:19 PM   #8
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Okay, no single driver is going to do bass, treble, and loud. The technology isn't (and won't ever be*) there.

So, we need to compromise.
How loud do you need to go?
How low do you want to go?
How much power do you have?
What cabinet size do you have to work with?

I'd argue for a small-ish satellite speaker, plus a subwoofer. I'd probably go for a coaxial 8".
Alternatively, the best sound-for-space package I've seen was a MTM with some 6" midbasses and a compression driver. No real low-frequency response, but a peaked tuning (like the Boominator) keeps the sound balanced.

Chris


*To do loud bass, you need lots of swept volume from the cone. This is very bad when you're trying to produce treble from the same cone - treble with wide dispersion needs a small radiating area, opposite to what bass needs.
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Old 20th January 2015, 08:19 AM   #9
panos1 is offline panos1  Greece
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yes imean the folded horn...
it makes 126 db rms so i think it;s ok....
i have two 50 liter boxes tuned to 55hz and i made a simulation with the fane woofer at my box....
i have -2 db at 60 hz....
so i thin it's ok..
what do you think?
this is my boxes
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Old 20th January 2015, 03:15 PM   #10
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Quote:
Originally Posted by chris661 View Post
Okay, no single driver is going to do bass, treble, and loud. The technology isn't (and won't ever be*) there.
Actually, it was available over a decade ago with the development of the +/- 2 dB 20-20 kHz Babb Lorelei with its uni-ball suspension, ultra long linear stroke 1"? VC in a 4th order BP chassis/cum waveguide capable of at least 400 W power handling to get THX mains reference performance [highest tested AFAIK before the project was sold off and ultimately shelved].

Don't have all the design details/specs anymore, but WRT cab design, an I.B. was a minuscule 1 ft^3! Considering the big gains in motor design in the last decade, I've no doubt that a longer stroke, higher power handling motor + surround could be made to reach 'FR' PA SPLs and over a much wider power response arc to boot as it was around 140 degs originally, so advancements in computer simming software could probably further optimize its grill/waveguide contour[s].

GM
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