Beyma 12XA30Nd: Help wanted with sealed box - diyAudio
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Old 27th April 2013, 09:43 PM   #1
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Default Beyma 12XA30Nd: Help wanted with sealed box

I came a cross a pair of these and would like to put them in a sealed box but I'm useless with modelling software so if someone would like to recommend one for me I'd appreciate it.

These will be used with a subwoofer so I'd like an F3 of about 60 Hz.

Also, I would like the enclosure to be as shallow as possible so is it OK to build it so that the back of the driver is just short of touching the back wall?
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Old 27th April 2013, 11:11 PM   #2
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Using THIS I got QTC 0.7, 16ltr, f3 117Hz. With a QTC of 0.5 it gives a 36ltr box and an f3 of 129Hz.
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Old 27th April 2013, 11:38 PM   #3
fpitas is offline fpitas  United States
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Originally Posted by InOtIn View Post
Also, I would like the enclosure to be as shallow as possible so is it OK to build it so that the back of the driver is just short of touching the back wall?
You'll likely get a reflection from the back wall out through the cone if you don't get some absorbent material in the path. Not sure how picky you are about the sound, but you'll get a little "boxiness" from that.
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Old 28th April 2013, 12:00 AM   #4
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Beyma 12xa30nd is a mid/bass coaxial driver, not suited for sub use in sealed box, sorry...
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Old 28th April 2013, 12:21 AM   #5
NiToNi is offline NiToNi  United Kingdom
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Originally Posted by fatmarley View Post
Using THIS I got QTC 0.7, 16ltr, f3 117Hz. With a QTC of 0.5 it gives a 36ltr box and an f3 of 129Hz.
Those F3's are a bit higher than he asked for. Would increasing the volume help?
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Old 28th April 2013, 12:30 AM   #6
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Originally Posted by fatmarley View Post
Using THIS I got QTC 0.7, 16ltr, f3 117Hz. With a QTC of 0.5 it gives a 36ltr box and an f3 of 129Hz.
Thanks but agree, F3 a bit too high though.
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Old 28th April 2013, 12:34 AM   #7
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Originally Posted by fpitas View Post
You'll likely get a reflection from the back wall out through the cone if you don't get some absorbent material in the path. Not sure how picky you are about the sound, but you'll get a little "boxiness" from that.
I'm rather picky so no boxiness accepted. Would bonded logic on the back wall do the trick? Overall I don't want to overdo the stuffing though since I think it can make the sound too dull.
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Old 28th April 2013, 12:41 AM   #8
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Originally Posted by bicefalo View Post
Beyma 12xa30nd is a mid/bass coaxial driver, not suited for sub use in sealed box, sorry...
Like I said I have a separate subwoofer for bass below 60 Hz so I don't need the driver to play lower than that. If you mean 12XA30Nd can't even do that in a sealed box, that's a different story. But with such a strong magnet and a bit of EQ, even a sealed box should be able to tame it, no?

I want to keep it simple though and ensure optimal transient response, that's why I'd prefer sealed. But what about MLTL then?
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Old 28th April 2013, 12:46 AM   #9
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Originally Posted by bicefalo View Post
Beyma 12xa30nd is a mid/bass coaxial driver, not suited for sub use in sealed box, sorry...
Sorry again I made mistake reading 1# post.....
Large flat sealed box can sounds OK if are quite lossy, I mean with thin lateral panels well damped with fiber.

which subwoofer are You going to use?
Xover frequency?
home or PA usage?
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Old 28th April 2013, 06:26 AM   #10
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Originally Posted by bicefalo View Post
Sorry again I made mistake reading 1# post.....
Large flat sealed box can sounds OK if are quite lossy, I mean with thin lateral panels well damped with fiber.

which subwoofer are You going to use?
Xover frequency?
home or PA usage?
No worries. Why does the box have to be lossy and you give an example of what you mean by 'lateral panels'?

Not sure yet, but DIY, perhaps TC Sounds or Rythmik, at ~60Hz. This will be for (demanding) home use.
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