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Old 13th October 2012, 01:08 AM   #31
ramallo is offline ramallo  Europe
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Thank you.

I tried a material similar to Bonded Logic, but thanks for the link.

The box have two types of fill, one on the wall is polyurethane foam and the other is wool filling the box.

With the first I added some absorption and increased the apparent volume of the box (The internal resonances going down in frequency), the wool is for decrease the Q of the resonances (by sharing the energy of the resonance in a greater number of frequencies), as well, the box have some braces for avoid some resonant modes of the walls (I did several waterfalls with a contact pickups). My first idea was do a losing cabinet (Like Rogers or Spendor) for expend part of the back energy on the walls. The box is made from 21mm baltic birch with the special rubber on the walls (very high density and weigth).

Not so much output at 5 kHz from the woofer, the piece in front of them partially prevents the output over 2kHz (Isn't designed for this function is just for high frecuency dispersion) (the woofer's low pass is much lower than the tweeter high pass)
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Last edited by ramallo; 13th October 2012 at 01:12 AM.
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Old 13th October 2012, 02:05 AM   #32
Lgrau is offline Lgrau  Denmark
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Quote:
Originally Posted by studiotech View Post
Lgrau, any more picts of the whole system? Thanks.

Greg
Hi,

The TPL is not yet integrated in a system, still experimenting.

Some pictures of my current(also unfinished) system can be found in my danish thread here:
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Old 26th October 2012, 05:20 PM   #33
Elias is offline Elias  Finland
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Quote:
Could not connect to User databaseUnknown database 'dev_diyaudio_forum'



I want to see too
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Old 26th October 2012, 05:26 PM   #34
ramallo is offline ramallo  Europe
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Quote:
Originally Posted by Elias View Post



I want to see too
On "my gallery"

But, looks like a forum error
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Old 26th October 2012, 06:26 PM   #35
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[QUOTE=ramallo;3198701]Without the felt damping pad, the 2 order distortion drops 20dB[/QUOT

a question about the felt damping pad. what type of felt and what was the orientation of the felt? SAE rated F-11 is very broad band absorber and if you orient so the back wave strikes the edge surface of the felt rather than the flat it can make a big difference (same with fiberglass). Best regards Moray James.
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Old 26th October 2012, 09:17 PM   #36
ramallo is offline ramallo  Europe
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[QUOTE=moray james;3216315]
Quote:
Originally Posted by ramallo View Post
Without the felt damping pad, the 2 order distortion drops 20dB[/QUOT

a question about the felt damping pad. what type of felt and what was the orientation of the felt? SAE rated F-11 is very broad band absorber and if you orient so the back wave strikes the edge surface of the felt rather than the flat it can make a big difference (same with fiberglass). Best regards Moray James.
Hi,

The felt is the original and must be leave off (is glued to the metal body), this felt is very dense and this is the problem (probably with the age will lose his strength and then improve its measures).

But thanks for the tip

Cheers
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Old 13th November 2012, 03:15 PM   #37
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What is the cheapest source for this driver at the moment?
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Old 26th November 2012, 04:41 PM   #38
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Hey guys I have a question about the resonant mode at ~1700 Hz. Can it be damped away by placing foam or a suspension on the diaphragm edges? I'm thinking about buying the membrane and doing my own mag circuit too. But I need output below < 1700 Hz, I expect.
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Old 26th November 2012, 07:18 PM   #39
Lgrau is offline Lgrau  Denmark
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Hi,

Its hard to dampen, Ive tried some experiments using bitumen directly on the diagphram. It daemped the resonanse but it was also spreaded out.

If you want to below its better to buy the Aurum Cantus diagphram IMO with a fs around 1KHz.

I also wants to try this because I wanted to crossover around 1KHz
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Old 27th November 2012, 07:35 AM   #40
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That's a bummer. It looks like the Aurum Cantus has much poorer distortion figures. There is always a 'gotcha!' in audio it seems.

Where did you apply the bitumen? The sides or the tops or both?

It might be best for us to learn the best way of making these. It would seem that it requires manual labor which explains the costs. The traces are simply enough. Bandsei has made some pretty decent progress so far. Etching should not be too difficult with a mask or stencil, given the right foil.
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