...mine is 30 duro,1/8 inches for the metallic cup of the HE400, i had not try higher duro because i think the 30 duro work so well for me
: with a razor blade or an exacto you cut a rectangular pieces in 6 little squares. ( it is not necessary to cut it before sticking it to the headphone, it was more easy for me to cut it after because i want them very close one another)I had originally stick 4 pieces of sorb at the bottom of the hoop, i cut now the four rectangular pieces of sorb in 6 pieces each, hence at one level i have 4 pieces of sorb, at another level i have divided these 4 pieces of sorb in 24 pieces, and i think that
... the principle is simple : divide the mass in cutting it in 6...
It is an experiment in relation with the basic material of your headphone, plastic or metallic, the densities of your headphones, etc,and you must explore by Yourself and experiment, and READ the thread of Edstrelow to know the basic...People dont read these days... i put the sorb. outside BECAUSE nobody already know the right from wrong now for this or that headphones in particular, hence i dont want to mess with the delicacy of the grill right now in assembling and desassembling it many times.
p.s. i put duro 30 1/8 inches on my HE400 i cannot imagine better...duro 30 is very malleable under pression and perhaps better for the HE400
IMPORTANT NOTE: i cannot insist enough on that : too much sorb or too big piece will DESTRUCT the sound...i made this mistake in the beginning... i cannot insist enough on that:worsening the sound is very easy...My 6 rules will help you to try and when you will got it right, the result will be unmistakable. Essentially it is the end result when you have a
clarification on all the spectrum,with an organic very fluid sound,restitution of a more natural midrange with more depth,nearly out of the ears soundstage, a real 3-d sound,this would be the end result for the HE 400...good luck to all
P.S.
description of the mod : i have
four rectangular pieces (3/4 inches by 1 inches) at the bottom of the hoop... the spacing is visible on the photos... i had
four other little pieces (each 2 set of 2 little squares pieces of approx 1/2 inches by 1/2 inches approx. distributed between the center of the hoop in the upper half of the cup... the height is very tight there with 1/8 inches thick pieces of sorb( if i had one i would have tried with 1/10 inches there ) .. it is important to cut all these pieces in 6 ,,, the sound is better more soundstage and very silky sound.... Hence i had now 8 pieces on each cup of the headphone in all cutted in six...Between the 2 groups of 6 pieces on each cup there is a void space of approx 2 inches 1/2 without pieces...
Conclusion
The naked metallic case of the HE400 product vibrations resonance that kill the sound... I had not listen with pure bliss to my he 400 really for next to 2 years because these vibrations plagued the sound... i changed 4 times of amplifier with some good results but nothing was great before i begin to investigate this sorb. mod. this thread of Edstrelow is a great discovery the most important one... the great crowd of headfiers listen now their headphone without knowing that they dont have access to their true potential... it is a pity... it is the reason i put my observation here...
In reality the Sorbothane application is not a modification of the headphone but a true restitution of the headphone potential... Perhaps it will be better to name this sorb. restitution rather than modification, it is in the end not a physical structural modification of the original product but the cancelling of the negative effect of vibration...
My method confirm Edstrelow discovery that the sorb. mod transform the Stax more than an upgrading amplification and i confirm that for the HE400, with the application rule i describe below...
I apologize for my bad English(it not my first language ) thanks for your kind interest
p.s. i had seen a video about
anax mod for taming senn HD800... i am pretty certain than the application of Sorbothane there will do a more miraculous cure... the reason is simple the material used in the anax mod does not have the filtration capacity of a pieces of sorbothane squared or diagonalized... A material only per se cannot filtrate highs and bass , sorb cannot if not squared, hence the anax mod must cure the peculiar high frequencies problem of this headphone but cannot cure all his vibration problem..I dont have an HD800 to experiment with,only my 2 cent as i say i am only an amateur... Same probably for ALL headphones...
EVIDENTLY ALL HERE PRESENTED LIKE FACTS ARE ONLY MY HUMBLE OPINION AND EXPERIENCE, I CANNOT BE RESPONSIBLE if you do not apply my guideline for 2 reasons: with sorbothane very little variation with form, cuts,thickness, duro, made BIG differences , and secondly in audio all is matter in the end of personal taste and past experiences...thanks to all of you
IMPORTANT NOTE AND ADDITIONAL INFORMATION : after 2 months with the sorb mod. it seems that the gluing process is very slow on metal, and the glue adhrence take weeks, I now observe a spectacular more imaging capacity and 3 d presence ....Hence WAIT for the better to come if you put the sorb on metal cups...I was listening the he 400 for 2 days now after 2 weeks without listening to them and i observe that upgrade with the gluing bonding adherence with awe...