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Old 4th June 2015, 05:29 PM   #1
Zoef is offline Zoef  Netherlands
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Default Speakers based on beyma 15xa38nd

Hi guys,

Need some help.
I want to build some speakers based on the beyma 15xa38nd coaxial drivers.
No extra tweeters or woofers. Just the beyma's. A bit like the old tannoy's.
What i need are some plans for the enclosures. (And some crossover schematics, if there are any)
I prefer mltl, tqwt or ported boxes.
If possible, could someone hook me up with some plans?


Hope someone can help me.


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Old 5th June 2015, 04:57 PM   #2
GM is offline GM  United States
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Greets!

I neither do drawings, just provide basic dimensions, nor design XOs, so tweaking the stock one is all I can recommend.

For cab alignments, what are your room dimensions and where they will be located, listening distance [Lp], max physical cab dimensions, average seated ear height and are you open to maybe having the driver somewhat above it if thereís no cab height restrictions?

Also, what type electronics will drive these and if tube, then ideally need its output impedance [series resistance, not tap value unless itís a matching impedance amp with a damping factor [DF] = 1.0].

GM
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Old 5th June 2015, 05:04 PM   #3
Zoef is offline Zoef  Netherlands
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My room is about 4.5 x 7.5 m. Maximum height would be about 1 m (maybe little more) and about 50 cm width and depth.

I want to use a (diy) pass aleph 3 . 30w class a. Would be serious overkill i think.

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Old 5th June 2015, 05:07 PM   #4
Zoef is offline Zoef  Netherlands
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I found a grf cabinet plan for the beyma's.. is that a good enclosure for it?


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Old 6th June 2015, 12:00 AM   #5
GM is offline GM  United States
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The GRF is a back loaded horn, so odds are the Beyma's specs are not compatible, but will need the driver specs it was designed for to be sure.

GM
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Old 6th June 2015, 12:09 AM   #6
freddi is offline freddi  United States
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it would "work" with the original Karlson K15 - you might use it in a straight MLTL too http://img825.imageshack.us/img825/5469/k15k.png
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Old 6th June 2015, 01:33 PM   #7
xrk971 is online now xrk971  United States
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That's a nice driver. 99dB, 0.29Qts, 4mm xmax, 2in coax CD, Nd magnets, 350watts program. Wow must cost some change.

http://www.beyma.com/getpdf.php?pid=15XA38Nd

I agree that Karlson K15 would be a very effective cabinet that would be very matched and knock you out of your socks at full power.

For deeper bass extension, maybe an XKi?
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Old 7th June 2015, 06:21 PM   #8
Zoef is offline Zoef  Netherlands
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Quote:
Originally Posted by freddi View Post
it would "work" with the original Karlson K15 - you might use it in a straight MLTL too http://img825.imageshack.us/img825/5469/k15k.png
Thanks freddi !

Going to take a look at this.
My wife agrees with the dimensions .
Always helps.

Don't read many positive reactions on these cabinets though...
Looking for some in home enclosures. Best possible sound.


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Last edited by Zoef; 7th June 2015 at 06:50 PM.
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Old 7th June 2015, 06:28 PM   #9
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Quote:
Originally Posted by xrk971 View Post
Wow must cost some change.
Yeah, 520 green backs at US speakers !
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Old 7th June 2015, 06:35 PM   #10
Zoef is offline Zoef  Netherlands
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GM: Freddi posted the driverspecs.
On this site the grf for the beyma's are posted: http://forum.speakerplans.com/15-sco...opic90924.html
As you can read he modified the horn. But if this is a good one.... i don't know.



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