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[ElectronicGoldMine] High impedance 300ohm 1.5' "made for a factory making expensive headphones" - Page 2

post #16 of 25
Quote:
Originally Posted by nikongod View Post

Is the ground hooked up properly? 

 

Measure resistance at the plug:

1: Tip to sleeve

2: Ring to sleeve

3: Ring to tip

 

1&2 should be the same within a few percent (perhaps 10%) 

3 should be equal to 1+2 or put another way 1&2 should each be half of 3. 

 

Mounting the drivers slightly behind the baffle should not have a significant effect on the sound, provided the driver membrane does not touch the actual baffle. In the pictures you posted it looks like there is a few mm clearance so this should not be an issue. 

 



I haven't tried this test yet....I am going to have to try this to see what I get.   thanks for the tip.

post #17 of 25

I think I may have to ditch trying to mount these drivers in a closed back design.  I tried moving the drivers closer to the surface, angled them to try to line up with ear cannals, and left a small vent from the ear side into the back side of the cup.  The low end seemed to drop off significantly..so I sealed up the vent and the low end came back.  But then the mid and highs went back to square one....compressed and subdued...sigh....  I think time to scrap the cup design and try the open back design similar to the Grado cups.  Got to take a break for a week and pick this up again....keep you guys updated.
 

post #18 of 25

Grado cups have a surprising effect on the sound. 

 

Try putting pads on the baffles you made, and just holding them to your head without any cups at all. If it works, figure out a headband. 


Edited by nikongod - 1/28/13 at 6:59am
post #19 of 25
Thread Starter 
Quote:
Originally Posted by nikongod View Post

just holding them to your head without any cups at all.

I am interested by the result of this experiment. Care to try it out?

post #20 of 25
Thread Starter 

I was wondering if you had any updates to share?

post #21 of 25

Anyone buy a set yet? From the pictures they look like junk but wont know till someone tries. Ill get a pair but just the same i'd rather not bother if someone else already did.

post #22 of 25

Sorry about not posting updates.  Tried a couple different designs and tunning mods.  The Sony cups don't work well.  The entire spectrum seems compressed.  I tried a design similar to Grados..Mid and highs are wide but lost the lower end.  I am about to give up on these drivers.  I am going to give it one last try with a design similar to the HiFiman...4 inch PVC pipe or wood tube.  Keep you guys updated as soon as I get something together.  I have to say that the sound I do get is very tight and controlled...if that is the right way to describe it.

 

 

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post #23 of 25

So what was the final assessment of these drivers? Did you try opening up the vent holes (if there are any)....or add dampening to the back of the driver?

post #24 of 25

Hmmn, those drivers look vaguely similar to Koss KSC35 / KSC75 drivers.

 

post #25 of 25

Nice project. Looking to make one someday. Any updates? Or you just gave up. ;)

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