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Damping Mechanical Energy Distortion of STAX and other phones with SORBOTHANE and other materials. - Page 54

post #796 of 797
Quote:
Originally Posted by chrismini View Post
 

I had an "Ah Hah" moment. When I installed the sorb70 around the edge of the inner cup of the HE-400's the grills were kind of barely staying in place. Yesterday both grills popped off leaving the drivers exposed. I figured "what the hell" and gave them a listen. I've never heard my HE-400's sound so fantastic! The openness of the high end never sounded so crisp and accurate. The bass thumped away like I was listening to a live performance. The mid's(vocals) were like I've never heard before. Now I know the danger of headphone drivers with no rear protection. They can be destroyed by mere carelessness. Any sharp object can penetrate and destroy the diaphragm. But the sound was nothing short of amazing!!  I've been listening to Steely Dan-Aja which is my go to recording when I audition any speaker or headphone. Now I switched to Lucinda Williams-Car Wheels on a Gravel Road. Same thing. 

 

So what I've been doing is placing these headphones in a protective cardboard box very carefully. I just can't see myself placing grills back on these headphones. It would be like switching a high-end low output moving coil cartridge for a high output moving magnet. Once you hear the MC, there's no going back. What I'd like to do is install a protective mesh to prevent inadvertent damage. Anyone got any ideas?

I cut mine from a pizza mesh plate i bought from a one dollar shop ( using before that a plastic grid mesh).... any grid, plastic or metal, easy to cut with not a too small square grid will do...:smile: 

 

 


Edited by richard51 - 3/15/17 at 12:33pm
post #797 of 797
Thread Starter 

I added some more 1/2 in 70 duro sorb to the 007a  and the sound again went up a couple of notches in performance, especially in the clarity of bass. The drums were tighter and the double basses growled.

 

I am doing the same now with my two Lambdas. The problem they pose, like many other phones, is that there are few if any places to mount sorbothane inside the ear cups. With the lambdas, I was able to place some 1/4

inch sorb on the back plates as shown here but 1/2 inch is too bulky and would extend beyond the top of the drivers, thus possible creating some reflections.

 

Fortunately we now know that damping can be applied to headbands so I added three pieces to the top of my Lambda LNS.  You can see three big lumps.  These have a double layer of electrical tape on their tops as well as being glued (3M80) and loosely taped to the band. This does an enormous amount to improve the sound, again as noted above in the bass.  There is a further jump in  clarity there now and I am hearing more bass instrumentation.  But the sound is not bassy, just clear sounding throughout the frequency range.

 

 

   Why is the thicker sorb better? Because it it works better at lower frequencies, according to the Sorbothane site. http://www.sorbothane.com/   

 

The way I conceptualize damping now is that the undamped phone is essentially buzzing with the Newtonian, equal and opposite energy from the driver. The buzzing gets back to the drivers both on the original ear and on the opposite ear through the headband.  Damping cuts the buzzing.  Thicker, denser sorb cuts more buzzing. 

 

 The problem is finding places where you can install  1/2 inch thick material. I would prefer to have these in the earcups because I suspect they would dampen more but as  note above, there is no real place to do this. As an alternate,  the headbands work well too. 

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