TL-box for BG20 Visaton - diyAudio
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Old 15th January 2013, 12:21 PM   #1
Gost22 is offline Gost22  Bolivia
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Lightbulb TL-box for BG20 Visaton

Hi guys!

I need design for TL-box for BG20 Visaton.Design may be bass reflex or similar.
Thank you for your cooperation.
Best Regards.
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File Type: jpg bg20.jpg (29.0 KB, 845 views)
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Old 15th January 2013, 08:46 PM   #2
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Given up on the W5?

Which is it? You say you want a TL & in the same sentence that it 'may be a bass reflex or similar.' So do you want a TL, or a bass reflex?

You can get a reasonable response similar to Augspurger's favoured alignment with a straight TL, 50in long, cross section of 265.375in^2, driver tapped in 12.5in down from the top. Stuff 1lb ft^3 dacron pillow stuffing.
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File Type: png BG20 TL.png (71.0 KB, 815 views)

Last edited by Scottmoose; 15th January 2013 at 08:50 PM.
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Old 15th January 2013, 08:53 PM   #3
xrk971 is offline xrk971  United States
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If this driver is anything like Betsy K, you may be able to do MLTL similar to WIBAQ thread and get lower end at expense of some SPL.
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Old 15th January 2013, 09:17 PM   #4
Gost22 is offline Gost22  Bolivia
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Unhappy TL-box design for BG20 Visaton

Guys let's go with the TL-box, or let your suggestion box, because I found full range drivers BG20 (Visaton) for 70EUR for pair, while drivers W5-1611saf 170Eur for the pair. So I want to box making for these speakers Visaton BG20. Please suggest a draft box.
Which crossover frequency to use to align the frequency diagram speaker BG20.
Can the draft (design) of this or these boxes (see Figure 1)
Thank you for your cooperation!
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File Type: jpg preview-bg-20-koax-large.jpg (15.3 KB, 795 views)

Last edited by Gost22; 15th January 2013 at 09:30 PM.
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Old 15th January 2013, 09:40 PM   #5
GM is offline GM  United States
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Greets!

I posted this MLTL many moons ago, but don't recall anyone building it/reporting back. Note that I have three sets of specs, so used the ones that required the biggest net Vb, lowest tuning figuring it might have some tuning flexibility.

L = 60"
CSA [WxD] = 178.35"^2
zdriver = 22.8"
zport = down near/at the bottom
Dport = 6"
Lport = 0.75"

All dims i.d. [inside] and approximate. Sim is minimally stuffed. It will need some form of EQ to flatten out the bass if not corner loaded. That, or use a larger vent to tune it higher.

GM
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File Type: gif Visaton BG20 35 Hz MLTL.gif (6.8 KB, 797 views)
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Old 17th January 2013, 06:54 AM   #6
Gost22 is offline Gost22  Bolivia
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Default TL-box design?

Hi guys!
E like I imagined it looks TL-box for full range Visaton GB20 speaker , so ask for help about the given dimensions of the TL-box.
So please if you are able to give the values ​​set in the outline box.
Are these switches can be used to align the frequency response?
Is it can be used box by the Russian ?
See figure:
Thanks for your cooperation.
Cheers!
Attached Images
File Type: jpg TL-box for BG20 (Visaton).JPG (84.4 KB, 761 views)
File Type: png Skretnica.png (13.4 KB, 305 views)
File Type: gif Kutija za BG20.gif (51.8 KB, 373 views)

Last edited by Gost22; 17th January 2013 at 06:57 AM.
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Old 17th January 2013, 07:09 AM   #7
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switches ?
Ha ha, maybe you're talking about those three passive components that compose the Notch Filter, which, yes, it aligns the response of the speaker in a box, on a baffle.
Nice that you name them 'switches', which is sort of Digital talking instead of Analog
(Linear)...me too, because I'm not really into electronic phenomena, I like to think of those components as switches, that take or release energy ...
BTW Build whatever you want, be it Voigt Pipe, reflex, MLTL,TL
'cos we cannot determine how it'll sound by just looking at some picture !
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Old 17th January 2013, 09:36 AM   #8
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by GM View Post
Greets!

I posted this MLTL many moons ago, but don't recall anyone building it/reporting back. Note that I have three sets of specs, so used the ones that required the biggest net Vb, lowest tuning figuring it might have some tuning flexibility.

L = 60"
CSA [WxD] = 178.35"^2
zdriver = 22.8"
zport = down near/at the bottom
Dport = 6"
Lport = 0.75"

All dims i.d. [inside] and approximate. Sim is minimally stuffed. It will need some form of EQ to flatten out the bass if not corner loaded. That, or use a larger vent to tune it higher.

GM
Hi GM!
If this is all you can to show the sketch (schematic) to be a little clearer.
thank you!
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Old 17th January 2013, 11:50 AM   #9
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Gost22 View Post
Hi guys!
E like I imagined it looks TL-box for full range Visaton GB20 speaker , so ask for help about the given dimensions of the TL-box.
So please if you are able to give the values ​​set in the outline box.
Are these switches can be used to align the frequency response?
Is it can be used box by the Russian ?
See figure:
Thanks for your cooperation.
Cheers!
You really should take a look at the BIB enclosure for the BG20. Use the BIB calculator by GM - it gives you all the dimensions you need. The BIB sounds good by most who try it out and accepts a wide range of drivers. It will be big though for a BG20 and have lots of bass - so much that you will not find any need for the BSC circuit - and in fact, you will probably have to reduce the bass output with stuffing or EQ'ing.

Here is the calculator: http://www.diyaudio.com/forums/attac...or_v1x.xls.zip

Since the BG20 has such a large Vas (3.88 ft^3), it will generate a very large enclosure (89 in tall x 30 in deep). There is a trick to reduce the size of the enclosure yet retain the characteristic sound of the BIB: reduce the Vas that you enter into the calculator. The length will still stay the same, but the volume is reduced and consequently, width and depth are much more manageable. You can also reduce the height if you set the tuning frequency of the BIB higher than the Fs of the driver. The BG20 has a very low Fs of 38 Hz. If you can live with a tuning freq of 47 Hz, and cut the Vas to 1.94 ft^3, the final dimensions come out to (assuming 0.75 in thick plywood): 16.5 in wide x 23.5 in deep x 72 in tall. This is a much more reasonable size, and this design will still have more bass than you will ever need.

If you are not familiar with what a BIB looks like, here is a design for a tiny 3,5 in driver that Jhutka came up with. The calculator will give you all the critical dimensions you need.

Good luck.
X

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Old 18th January 2013, 06:57 AM   #10
Gost22 is offline Gost22  Bolivia
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Hi xrk971!
This picture is very small please give the increase.
thank you!
Cheers!
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