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View Full Discussion Since I was so impressed with THX00 pads' quality, I have grown interested in their sheepskin pads that are made for TH900: http://dekoniaudio.com/product/dekoni-audio-fostex-th900-elite-sheepskin-replacement-memory-foam-ear-pad-set/
So I acquired a pair couple of days ago, and tested the pair with and without the acoustic guides made for THX00 on my HATS.
Comfort & Fit
First of all, talk about craftsmanship! These pads are gorgeously made just like Dekoni THX00 pads. Since the contact area to the skin is a lot smaller, fitting is very light and airy on the head while being as comfortable as their THX00 pads. It would definitely feel less stuffy in summer too. In addition, a listener can move positioning of his ear more freely within the pads' inner circle due to their openings made wider, giving the listener an option to look for his 'acoustic sweet spot' as he see it fits.
TH900 pads(without the ring) vs Stock Fostex
As I have suspected, TH900 pads are truly interesting, even more so than Dekoni THX00 pads. They certainly do change the tonality of THX00 quite a bit, but retains THX00's signature brassy texture in the treble really well; The high frequency response, which involves with standing waves, above 3 kHz is mostly unaffected (regardless of the ring's existence) while the other frequency range plunges down up to 3 dB at most. As a result, the perceived tonal balance becomes quite brighter compared to the stock sound as if a very subtle high-shelf filter which boosts above 3 kHz for 3 dB has been applied. And with extra area added within the inner head-to-pad cavity, THX00's sound stage feels much larger.
With the ring vs Without the ring
From the previous experiment, it has been found out the rings work like a low-shelf filter that affects the frequency range below 1 kHz. It is no exception with Dekoni TH900 pads. With those extra acoustic guides added, THX00's linear characteristic becomes VERY close to that of the stock pads, except in the mid range. The result of extra volume of air being displaced by the driver within the pads' cavity is reflected as a sensitivity loss of ~4 dB from 300Hz to 4kHz. Thus, it can be assumed that the ring + TH900 pad combination works like a band-stop filter; The well known V-shaped signature sound of THX00 is now much more pronounced.
Dekoni(with the ring) vs Dekoni(with the ring)
Compared to Dekoni's THX00 pads, their TH900 pads sound closer to the stock sound due to treble characteristics being effectively preserved above 3 kHz. It is notable the mid range is slightly more recessed with TH900 pads, but TH900 pads give out impression of more open-air sound.
Not only Dekoni's TH900 pads yield same degree of comfort & built quality compared to their own THX00 pads, but the pair also would give a listener much more intimate auditory experience by providing enhanced signature quality of THX00 with a bigger sound stage. And while TH900 pads only pump up the treble slightly, with the extra rings added, the pads boost the bass and the treble altogether. Here is my message to any enthusiasts who would like to add more excitement to his THX00, Denon, or Emu, but got tired of all kinds of wood housings confusing you: Try different pads instead and hear the big difference.
Can you try the thick paper mod Dekoni's THX00 I posted below. Tt brings more bass without taking away from instrument seperation.
I can giv it a shot if a definitive dimension is given so that the end result is reproducible.
I actually cut a few different sizes from same paper so that I could hear how each size sounds. The thickness of the paper also is a factor or softness of the plastic.
Maybe i can try to cut out a sheet of foam pad(polyurethane i blv) that i bought for crafting. Let me know the dimension of the cutout n ill giv it a shot.
I don't think foam will work the bass gets lost in the pad you are simply blocking the larger part of the pad with thick paper or soft plastic. I just tuck mine under the pad without taking pad off headphone. There is pictures and sizes in the headfi thread. I need to get some time right a full post on it. But honesty not much to it just tuck something under the pad. I cut paper from a tax folder that was thick like old school paper folder from elementary school. The important part is getting the outer edge same size and roundness as headphone frame. After that you can make it various sizes for more or less bass. Mine is a thick banana shape covering about 2/3 of the back thicker pad. when I covered the front smaller half of the pad I loose clarity and it sounds like stock pad. If I only cover back pad I get bass and clarity. Bass is more clear too.