[chinsettawong]

Anything is possible. If you have a chance to try, please try them and let us know the results.

 

[lkos98]

I have done some measurements with my in-ear headphones. Here they are:
@Ulfar4 There is some improvement of the bass bellow 40 Hz with about 2dB, but I don't think I can hear it. Also there is very nasty peak at around 3-4 kHz with 15mm neck, compared to no neck - the peak is still there, but not so significant.
Any thoughts how to improve the response? High frequencies also go too high, I may need to put some light foam in the neck.

 

[-JFK-]

Hi all,

Long time !
I have finish my CNC and started my new stators.

Made with 7075-T6 aluminium, 2mm thick.
Holes are 3mm with 0.5mm 45° chamfer.

What do you think about it ?

 

[chinsettawong]

Hi all,

Long time !
I have finish my CNC and started my new stators.

Made with 7075-T6 aluminium, 2mm thick.
Holes are 3mm with 0.5mm 45° chamfer.

What do you think about it ?

Those look really nice!

 

[lkos98]

Hi all,

Long time !
I have finish my CNC and started my new stators.

Made with 7075-T6 aluminium, 2mm thick.
Holes are 3mm with 0.5mm 45° chamfer.

What do you think about it ?

They look great!. Could you share the active area, and what's the holes/total area ratio? From the picture it looks more than 50%, but this could be because of the chamfer.

 

[-JFK-]

They look great!. Could you share the active area, and what's the holes/total area ratio? From the picture it looks more than 50%, but this could be because of the chamfer.

Hi,
The holes/total ratio is, 56.8% (ignoring the chamfer).
The active area is , 105x85mm

I'm working on the amplifier, "DSP, D class, high tension".
It will work in the next 3 months.
So exited to listen it.

 

[chinsettawong]

Are you planning to use 0.5mm spacers?

 

[-JFK-]

Are you planning to use 0.5mm spacers?

I'm on 0.8mm for now, let's try.

 

[chinsettawong]

I'm on 0.8mm for now, let's try.

0.8 mm will be

 

[tib8]

Here is my first driver. It has 100mm diameter - from that 90mm is active.
I used 0.6mm spacers, but it was too easy to overdrive it (membrane touched the stator), so first I tryed to flip the stators, which surprisingly did not decrease the volume.
Then instead I doubled the spacers to 1.2mm. So now only the amp is overdriven at the highest volumes.

I drive it currently from my normal speaker amp trough a small 2x115V : 2x7.5V transformer. The membrane connected to 650V bias.
The bottleneck is now definitely the transformer so my next step will be to build the direct amplifier. The it will make sense to do some measurements.

 

[chinsettawong]

Nice work! With 1.2mm spacers, you can increase the bias voltage to over 1KV. That will increase the loudness more. However, if you reduce the active diameter down to around 80mm, the spacers of 0.6 will work a whole lot better.

 

[DrBiehl]

Very nice build. My idea is to also do 90mm active area. I was going to use 0.64 spacer but based on your results I am inclined to use 0.8 or even 1mm spacers to prevent the membrane from touching the stators. Let us know how they sound

 

[tib8]

Very nice build. My idea is to also do 90mm active area. I was going to use 0.64 spacer but based on your results I am inclined to use 0.8 or even 1mm spacers to prevent the membrane from touching the stators. Let us know how they sound

Now the prototype is finished (including the amplifier). And I must say it sounds just as I have expected: crisp clear, transparent highs, enough bass. Accurate transients, blah blah, blah. It is very nice to listen.
Now all my kids wants one, so I have to figure out nicer packaging, and a smaller power supply for the amp.
Also I need to buy a DAC because the sound card in the computer is definitely the new bottleneck.

 

[chinsettawong]

Very nice! By the way, try not to twist the cables of the headphones together like that because it increases the capacitance of the cable and makes it more difficult for the amplifier to drive the headphones.

 

[Sky44]

Bonjour tout le monde.
Je suis à la recherche de plans cotés des deux prises Stax.
Impossible de les retrouver aujourd'hui.
Les liens de Kévin Gilmore ne fonctionnent plus
Une aide s'il vous plaît.
C

Bonjour,

Avez-vous trouvé les plans ?

Au départ, Stax a utilisé les prises SRC en bakélite d'un fabricant japonais.

Les broches des prises sont celles des XLR 3 broches.

Bien cordialement,

Philippe Hiraga.