Beyma SM-112/N Enclosure Help - diyAudio
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Old 23rd November 2012, 12:14 PM   #1
Vostro is offline Vostro  South Africa
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Default Beyma SM-112/N Enclosure Help

Hi I really hope someone will have time to help.
I have a Beyma SM-112/N Driver and want to use it as a Music subwoofer at home.
I'm not really sure if its a good driver for this use, any advice will be nice.

What I really need is a design or a Sub enclosure for this speaker,
I've tried once in the past to make a box on my own for another speaker and I wasn't happy with the results,
That's why I ask for help for this one.
My main use will be listening to music, all types, from Linkin park to Enigma, to any pop music.

My left and right speakers are BOSTON ACOUSTICS A26 Bookshelf Speakers, on DIY APEX amplifiers.

Thanks
http://profesional.beyma.com/pdf/SM-112%20NE.pdf

Last edited by Vostro; 23rd November 2012 at 12:31 PM.
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Old 23rd November 2012, 03:39 PM   #2
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Vostro View Post
Hi I really hope someone will have time to help.
I have a Beyma SM-112/N Driver and want to use it as a Music subwoofer at home.
I'm not really sure if its a good driver for this use, any advice will be nice.

What I really need is a design or a Sub enclosure for this speaker,
I've tried once in the past to make a box on my own for another speaker and I wasn't happy with the results,
That's why I ask for help for this one.
My main use will be listening to music, all types, from Linkin park to Enigma, to any pop music.

My left and right speakers are BOSTON ACOUSTICS A26 Bookshelf Speakers, on DIY APEX amplifiers.

Thanks
http://profesional.beyma.com/pdf/SM-112%20NE.pdf
Hi Vostro,

The Beyma driver is IMO very suited for a quality quarter-wave based sub:

Here is an example constituting a folded OD_T-TQWT (Offset Driver_Tapped-
Tapered Quarter-Wave Tube that should be lined with damping material.

b
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File Type: jpg Beyma_SM-112 NE.JPG (667.6 KB, 264 views)
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Old 24th November 2012, 06:46 PM   #3
Vostro is offline Vostro  South Africa
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Thanks for the reply, but would this be compact, I don't have a big living room,
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Old 24th November 2012, 07:08 PM   #4
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Vostro View Post
..... but would this be compact......
very high Fs, and high Qts
but would still be tempting to try it with big slot ports a'la Onken style ......Bjorn, are you there ?
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Old 25th November 2012, 12:58 AM   #5
tinitus is offline tinitus  Europe
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I did try a calculation on vented BR and came out with 130 liter netto, with very low roll off around 30hz
and interestingly it appears to handle big slot ports
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Old 25th November 2012, 12:32 PM   #6
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by tinitus View Post
I did try a calculation on vented BR and came out with 130 liter netto, with very low roll off around 30hz
and interestingly it appears to handle big slot ports
Hi tinitus,

You're absolutely right, 130L is optimal for the driver. From this volume its easy to scale a port system to suite a conventional BR or quarter-wave type.
Note: Use an seeding port area of ~Sd/3 to start with.

Use HR or an another program that take in account the port placement and can handle quarter-wave resonances.

First: Keep the box volume constant(Opt BR) and resize the port length (to fit an enclosure of your choice), then add port area until the BW drops more than you wish.

Here is a simulation that can be used as starting point to expand the port sizes. Picture#1:

b

Ps:
In another thread we talked about adding cone weight to a PD.1550 and
Ive lost track of the original thread but posting my suggestions here instead. Picture#2:

Quote:
Originally Posted by tinitus View Post
this one ? I can move it to there ? precision devices pd 1550
Of course ,move it where it belongs

b
Attached Images
File Type: jpg Beyma_SM-112 NE_BR_MLTL.JPG (544.4 KB, 228 views)
File Type: jpg PD.1550_100g-add_PD186_85g-add.jpg (750.4 KB, 212 views)
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Old 25th November 2012, 06:12 PM   #7
Vostro is offline Vostro  South Africa
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Thanks guys but I think I'm in over my head, I have never designed a enclosure, and I have no idea
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Old 25th November 2012, 06:22 PM   #8
tinitus is offline tinitus  Europe
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what do mean ? its just a box
you have the woofer, right ?

we should be able to make you a drawing, if thats all you need to build it

but ofcourse you also need a plateamp with xo
do you know anything about these things ?
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Old 26th November 2012, 02:34 PM   #9
Vostro is offline Vostro  South Africa
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hehe I looked at the numbers and got lost, yes I already have the speaker,
If the forum members are willing to help with a darwing, Ill be so so happy,

Im going to use a Apex B500 amplifier with his subfilter preamp.

Thanks again for being so helpfull.

I have some knowledge on amplifiers, just not speakers
Ive been busy on amp design as a hobby.
http://www.diyaudio.com/forums/solid-state/213757-second-attempt-building-my-own-amp-scratch-7.html
Attached Images
File Type: jpg Beyma.jpg (328.7 KB, 176 views)

Last edited by Vostro; 26th November 2012 at 02:40 PM.
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Old 26th November 2012, 06:06 PM   #10
tinitus is offline tinitus  Europe
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Originally Posted by Vostro View Post
hehe I looked at the numbers and got lost....
yeah, I know ......bjorn is 'advanced'

but we still got the same number for vented, 130liter(netto)
brutto its close to a box like 55x55x55cm
not exactly those numbers
just to get a figure of its size
is that a size you can handle ?

also need to know what kind of wood you can get
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