TH 15" flat response to 35Hz (-3dB) - By LORDSANSUI - Page 12 - diyAudio
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Old 8th January 2017, 03:32 PM   #111
lm324 is offline lm324  Brazil
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Hi,

SNAKE PROFISSIONAL - Ultrapark Group

bye
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Old 8th January 2017, 11:46 PM   #112
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The company was sold after some problem after his founder death.

TO check the products you can surf at the old one that still have all datasheet but they are in Portuguese.

Produtos
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Old 9th January 2017, 01:20 PM   #113
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Hi, have you done any sims with the B&C 15TBW100? Thanks!
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Old 9th January 2017, 09:54 PM   #114
Zero D is offline Zero D  United Kingdom
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@ lm324 & LORDSANSUI

Thanx
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Old 10th January 2017, 02:51 PM   #115
stewin is offline stewin  Kenya
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hi lordsansui , is tapped horn louder than bandpass box ,for example the nexo ls series??
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Old 20th January 2017, 09:00 PM   #116
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@ USRFobiwan

The option A and B were left in the past, due to diaphragm displacement i tunned the project to safety region, you can find it on the history or wait some more posts will i complete the build so i will repost the design again.

@ turbodawg

Yeah, i simulated all drivers from the list posted on the topic #105 and I don't recommend the B&C 15TBW100 for this spec, see below the response @2,83V. To use it you should change a lot the dimensions.

Left the frequency response comparison between Snake HPX2150 and B&C 15TBW100, and right just the B&C one.

Click the image to open in full size.
Direct image link https://s29.postimg.org/t0zpfx33r/15_TBW100.png

@ stewin

I never build a bandpass cab, from what I read till now, it can be more efficiency then tapped horn but, people always complain about it being a kind of "one note" cab and it maybe this came from high distortion additionaly it has more restricted bandwidth frequency response. So I think for who need just SPL it's a good option, for who need SPL and HI-FI response looks like Tapped are way better.

There are many guys much more experience then me to help you in this case.
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Old 5th February 2017, 12:32 PM   #117
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I just bought the polywood and the build process begun.

Click the image to open in full size.
Direct image link: https://s23.postimg.org/dp19lzdyj/P_20170203_190913.jpg
Click the image to open in full size.
Direct image link: https://s27.postimg.org/la5wcy91v/P_20170203_194148.jpg
Click the image to open in full size.
Direct image link: https://s24.postimg.org/68zxl1ec5/P_20170203_212317.jpg

I will build 4 of them and I don't have much margin for errors so I decided to increase thickness from 15mm to 18mm, the dimensions were adjusted to keep the same frequency response as 15mm, so for who wanna build with 15mm that plan still works.

For 18mm here are the data updated.

Hornresp input data

Click the image to open in full size.
Direct image link: https://s28.postimg.org/9c76i8qgd/SS...8mm_Inputs.png

Frequency response

Click the image to open in full size.
Direct image link: https://s24.postimg.org/kkdsajxed/SS...al_18mm_FR.png

18mm polywood plan

Click the image to open in full size.
Direct image link: https://s23.postimg.org/83gqatgbv/SS..._18mm_Plan.png

Bracers and cone correction (2,35 L from the driver + 0,87L from bafle circular cut = 3,24 L total cone correction)

Click the image to open in full size.
Direct image link: https://s23.postimg.org/nr4p6okt7/SS...mm_Bracers.png
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Old 5th February 2017, 03:49 PM   #118
tb46 is offline tb46  United States
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Hi LORDSANSUI,

Looks good. As always, let's hope the T/S parameters are correct. Will you be able to make measurements?

Regards,
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Old 5th February 2017, 10:09 PM   #119
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Hi Oliver,

I don't know how to proper mesure the T/S, maybe is not hard, but I'd like to measure frequency response first. Snake is the best Brazilian company for drivers and used to be very reliable, but we never know

Do you have any documents about how to measure both of them?
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Old 6th February 2017, 02:08 AM   #120
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Unfortunately I jumped (again?) into this thread a bit too late, but here are some suggestions for v2 of your horn, if you ever come to that.

1st of all is to remove the "dead" space in your horn by adjusting the layout to take into consideration a longer path length AND the cone compensation that you want to insert into the design. you can either achieve a lower Fb or, if you want, resize the horn a little smaller to bring Fb back up to your target.

2nd is to use the bracing scheme I've tried to illustrate in the picture. Use solid 1/2 ply, with cutouts for where the internal panels fit in, and perforate the rest with a circle saw. Use two bracing panels like that and that should basically kill any vibration on the top external panel. If you do NOT brace that top panel properly, it may end up tossing whatever you put on it. Ask me how I know this .

Finally, consider inserting damping material into the section of the horn as illustrated - this will reduce the ripple above the passband with minimum impact in the TH's passband.
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