Diy AMT - Page 17

solhaga · 31st January 2013, 10:09 AM

What is the resistance and how thick alu did you use?

båndsei · 31st January 2013, 02:36 PM

Most of your questions are ansvered erlyer in this tread
The tape I bought was quite expensive.500 Dkr.50mm.x66meter.
alu is 7my.and resistance depends on width thicknes and length.
I aim for app. 4ohms.And usesual I succed.

Bernt.

solhaga · 31st January 2013, 03:26 PM

Yeah, I guess I have to read it from the start again

Thanks for your patience.

Perhaps my next question is answered as well, but I guess that you have tape on both sides of the alu?

7 um can be quite tricky to handle, I´ve tried 6 um once and it was impossible to not accidently tear it apart.

I don´t find 500 Dkr expensive, considering how many tweeters you can build.
I was thinking if any wider tape could easily be ordered so that one doesn´t need to overlap. Or does that pose problem when applying the tape?

båndsei · 31st January 2013, 06:00 PM

I use only one layer of tape.Exept at the ends,where I use 5mm.wide mylartape to guard the alu from tearing in the tool.
In Denmark i buy 7my alu with paper.Paper is easy to remove after handling.
No problem to get wider tape from my Danish supplyer.
And it is useably too.But costs maybe like 2 replacements diaphragms from ESS.

Bernt.

solhaga · 1st February 2013, 03:33 AM

Well, 7 um with sounds great. Could I ask you where you get it?

båndsei · 09:04 AM

Sure.
In Denmark it is easy to get some.You buy it in household stores like Brugsen,Kvickly,Irma and it is specified thicknes.Coop Danmark is the mother firm.It comes in 30 cm.wide and 10meter length and used for packaging food.
Hope it helps.

Bernt

solhaga · 2nd February 2013, 09:11 AM

Ok, that´s a new one. I always have used pure alufoil, bought at the same kind of stores.
I never considered the paper/alu-foils. I´ll keep my eyes open then.

/Claes

båndsei · 7th March 2013, 06:00 PM

Here is my latest atempt to get low an less distortion.
Pleats 6.5 mm. 28 lines 40mm with ,and 170mm length:
[IMG]

[/IMG]

Red is DIY green is ESS Amt.
Later i will show measures and materials from my folding tool

Bernt

solhaga · 8th March 2013, 03:35 AM

Any idea what might cause the higher distorsion around 500 Hz?
If that could be reduced it would seem that your DIY AMT is far better than the ESS AMT, THD wise.

solhaga · 8th March 2013, 05:38 AM

Concerning the Amplitude: any theory of why the DIY AMT has lower output in the lower regions? What are the Bl of the both AMTs do you reckon?

That the response is higher in the highs could be an advantage for my forecoming project: a line array of a number of DIY AMTs.
It could be useful in mitigating the comb effect. Also, no need to bother with getting the resistance high, 1 ohm would be enough if you have four or six in series.

2nd February 2013, 09:02 AM	#166
båndsei diyAudio Member Join Date: Dec 2008	Sure. In Denmark it is easy to get some.You buy it in household stores like Brugsen,Kvickly,Irma and it is specified thicknes.Coop Danmark is the mother firm.It comes in 30 cm.wide and 10meter length and used for packaging food. Hope it helps. Bernt Last edited by båndsei; 2nd February 2013 at 09:04 AM.

7th March 2013, 06:00 PM	#168
båndsei diyAudio Member Join Date: Dec 2008	Here is my latest atempt to get low an less distortion. Pleats 6.5 mm. 28 lines 40mm with ,and 170mm length: [IMG][/IMG] Red is DIY green is ESS Amt. Later i will show measures and materials from my folding tool Bernt

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31st January 2013, 10:09 AM	#161
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	What is the resistance and how thick alu did you use?

31st January 2013, 02:36 PM	#162
båndsei diyAudio Member Join Date: Dec 2008	Most of your questions are ansvered erlyer in this tread The tape I bought was quite expensive.500 Dkr.50mm.x66meter. alu is 7my.and resistance depends on width thicknes and length. I aim for app. 4ohms.And usesual I succed. Bernt.

31st January 2013, 03:26 PM	#163
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	Yeah, I guess I have to read it from the start again Thanks for your patience. Perhaps my next question is answered as well, but I guess that you have tape on both sides of the alu? 7 um can be quite tricky to handle, I´ve tried 6 um once and it was impossible to not accidently tear it apart. I don´t find 500 Dkr expensive, considering how many tweeters you can build. I was thinking if any wider tape could easily be ordered so that one doesn´t need to overlap. Or does that pose problem when applying the tape?

31st January 2013, 06:00 PM	#164
båndsei diyAudio Member Join Date: Dec 2008	I use only one layer of tape.Exept at the ends,where I use 5mm.wide mylartape to guard the alu from tearing in the tool. In Denmark i buy 7my alu with paper.Paper is easy to remove after handling. No problem to get wider tape from my Danish supplyer. And it is useably too.But costs maybe like 2 replacements diaphragms from ESS. Bernt.

1st February 2013, 03:33 AM	#165
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	Well, 7 um with sounds great. Could I ask you where you get it?

2nd February 2013, 09:11 AM	#167
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	Ok, that´s a new one. I always have used pure alufoil, bought at the same kind of stores. I never considered the paper/alu-foils. I´ll keep my eyes open then. /Claes

8th March 2013, 03:35 AM	#169
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	Any idea what might cause the higher distorsion around 500 Hz? If that could be reduced it would seem that your DIY AMT is far better than the ESS AMT, THD wise.

8th March 2013, 05:38 AM	#170
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	Concerning the Amplitude: any theory of why the DIY AMT has lower output in the lower regions? What are the Bl of the both AMTs do you reckon? That the response is higher in the highs could be an advantage for my forecoming project: a line array of a number of DIY AMTs. It could be useful in mitigating the comb effect. Also, no need to bother with getting the resistance high, 1 ohm would be enough if you have four or six in series.