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-   -   Beyma SM-112/N Enclosure Help (http://www.diyaudio.com/forums/subwoofers/224138-beyma-sm-112-n-enclosure-help.html)

Vostro 23rd November 2012 01:14 PM

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

bjorno 23rd November 2012 04:39 PM

1 Attachment(s)
Quote:

Originally Posted by Vostro (Post 3252966)
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:)

Vostro 24th November 2012 07:46 PM

Thanks for the reply, but would this be compact, I don't have a big living room,

tinitus 24th November 2012 08:08 PM

Quote:

Originally Posted by Vostro (Post 3254685)
..... but would this be compact......

very high Fs, and high Qts :scratch2:
but would still be tempting to try it with big slot ports a'la Onken style ......Bjorn, are you there ? :D

tinitus 25th November 2012 01:58 AM

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

bjorno 25th November 2012 01:32 PM

2 Attachment(s)
Quote:

Originally Posted by tinitus (Post 3255124)
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 (Post 3255660)
this one ? I can move it to there ? http://www.diyaudio.com/forums/subwo...pd-1550-a.html

Of course ,move it where it belongs :D

b:)

Vostro 25th November 2012 07:12 PM

Thanks guys but I think I'm in over my head, I have never designed a enclosure, and I have no idea :)

tinitus 25th November 2012 07:22 PM

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 ?

Vostro 26th November 2012 03:34 PM

1 Attachment(s)
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 :D
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

tinitus 26th November 2012 07:06 PM

Quote:

Originally Posted by Vostro (Post 3257422)
hehe I looked at the numbers and got lost....

yeah, I know ......bjorn is 'advanced' :D

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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