bidoux
100+ Head-Fier
- Joined
- Jul 10, 2008
- Posts
- 419
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- 12
I saved your picture with the uhu por tube a while back but didn't remember it until now ... Have you tried the two other type of glue I mentionned as well ?
I saved your picture with the uhu por tube a while back but didn't remember it until now ... Have you tried the two other type of glue I mentionned as well ?
How is the electrical connection to the diaphragm itself made? I was under the impression that the wire went to the copper on the PCB ring.
I have some of this: http://www.ebay.co.uk/itm/CONDUCTIVE-REPAIR-WIRE-GLUE-PAINT-ADHESIVE-NO-SOLDER-FOR-MODS-REPAIRS-/221201404191?pt=UK_Home_Garden_PowerTools_SM&hash=item3380a1911f ...carbon loaded conductive glue.
w
So you apply the antistatic fluid to one side of the diaphragm only? I would have thought you could double the force on the diaphragm if there is twice as much charge distributed on it...
w
The equation that rules the way the diaphragm moves only considers the difference in voltage thus it is not necessary to double coat the diaphragm.
Well yes but the parameter that you can easily control and impose to the headphone is not the charge, it is the voltage. You have to see an electrostatic speaker as a capacitor, but since the diaphragm is mobile, the capacity is not constant. Once you have imposed the voltage, you can deduce the force applied to the diaphragm by using the law that links the charge and the voltage in a capacitor :
(v is imposed, q is linked to the position of the diaphragm and the geometry of your cell)
Finished up a new pair of headphones this weekend (with the exception of the top band which needs some work).
Since I had some laying around, they are built with the HD600/650 earpads. They are built with 2uM mylar with 0.5mm spacers. I have them biased at 400V since that's what my amplifier puts out, but I'm sure they could go higher its not even close to instability. Open-air resonance is 175hz.
I'll have to do a lot more listening before I do any real comparisons to my SR007 clones, but upon first impression they seem to be more forward in the midrange (might be hearing the 7khz dip that's always been in my other pair that is not present in these). The soundstage is quite a bit wider than the SR007 clones which is good.
Some pictures of construction:
Wow, those look awesome! What is the size of your diaphragm? Your holes look big and are very close to each other. I think you must have a very high open area. Do you like them better than your previous pair?
Congratulations!
Wachara C.
The active area is a 3.225 x 2.2075 oval. The open-area is somewhere around 60%, haven't precisely calculated it. The stators are 1.6mm instead of my typical 1mm in order to keep them plenty rigid.
I don't think I like them better, although not necessarily worse either. I think both will probably remain in my active headphone collection. They are much, much brighter (too much for my taste), but I really love the sound stage which is so far beyond my old pair. I need to experiment with damping foam, as right now they are wide open, which might help a bit to calm the brightness. I'll probably also play with lower tension, since I have a ton of headroom on stability.