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Old 12th August 2003, 08:05 AM   #1
zek is offline zek  Serbia
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Default What eclosure for Visaton BG20

Please help me to calculate proper enclosure for Visaton BG20 fullrange speakers. I think about ML TL version by Mr. M.J. King.

http://www.visaton.com/english/artikel/art_135.htm

Thanks in advance.
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Old 12th August 2003, 03:24 PM   #2
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Visaton has also a new version the check the >B200< Maybe it is worth considering.

The B200 is being discussed on the Visaton forum and the first design with it
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Old 12th August 2003, 04:15 PM   #3
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If you are going to drive it with a tube amp I'll need its output impedance, and even then the design will be only as good as the published specs allow.

GM
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Old 13th August 2003, 05:47 AM   #4
zek is offline zek  Serbia
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Thank you LaMa for the first design with B200.

GM: I am going to drive it with Hiraga Class A ss amp with Conrad-Johnson clone tube preamp.

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Old 13th August 2003, 09:42 PM   #5
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L = 26.93" (68.4cm)

So/SL = 187.38"^2 (1208.84cm^2)

I prefer to use golden ratio dims where practical since the sim assumes a round pipe, so FWIW: w = 17.42" (44.24cm), d = 12.75" (32.38cm)

vent dia. = 3" (7.62cm)

vent length = 1.5" (3.8cm)

driver down 14.63" (37.17cm)

For FR drivers I prefer to mount them off center in a golden ratio when the baffle is wide enough, or 10.75" (27.3cm)/6.67" (16.94cm). This of course requires mirror image baffles. Orientation in-room is a personal preference.

stuffing = ~9oz (~255g)

All dims are inside. Distribute the stuffing from below the driver upwards and place the vent near/at the bottom. This is a max flat alignment (F3 = Fs in this case), so if placed near a wall or corner it may be a bit boomy, so you may need to experiment with longer vents in 0.5" (1.25cm) increments to 'tighten' it up. Also, you will need some form of baffle step compensation to balance out the highs to lows if not up against a wall or corner.

HTH,

GM
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Old 14th August 2003, 06:00 AM   #6
zek is offline zek  Serbia
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Thank you GM for so detailed design.
As I see enclosure is "only" 27" high (L).
What about some floorstanding model of ~ 40" height.




Thanks a lot.

Regards

Zek
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Old 14th August 2003, 03:04 PM   #7
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Drivers want to 'feel' a certain amount of compliance around them as well as total Vb based on their electro-mechanical properties. This limits the pipe's Vb, therefore its length for best performance. Also, the longer the pipe, the lower its resonance, so once it becomes longer than what's required for the tuning, a peaking at Fb occurs, with the attendant underdamped dip in the response above it, which gets worse with increasing length.

Many folks find it sonically acceptable, but I'm after the most accurate reproduction I can get within a driver's limitations for a given cab type so I don't recommend them, and I believe once you've listened to a well damped pipe for awhile you won't either.

Since pipes have high aspect ratios and more acoustic energy to dissipate than a typical rectangular cab, I recommend making it whatever height is required to get the driver up where you want it and filling the cavity below it with a massive material such as sand, etc.. I prefer kitty litter as a good compromise between mass/damping/cost. If you don't mind the added height or extra cost, either adding a mass loaded cavity above the pipe or a heavy marble/slate/whatever decorative top helps performance a bit also.

GM
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Old 15th August 2003, 05:28 AM   #8
zek is offline zek  Serbia
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Thank yuo GM.

Your explanation are welcome.

Regards

Zek
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