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Title : Sony MDR-MA100
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Harry
Harry
Total thread: 131
Total reply: 50

Post #82
Sony MDR-MA100
It was around middle of 2012, when I was in eMart (a supermarket in Seoul), I saw this Sony MDR-MA100 headphone for around $13, I immediately purchased it by impulse, no other reason just simply feel boring and for the price I thought why not .. ;-)

When I got home and tried it, I was very surprised by the sound of this open-back headphone, the high is good and the bass is okay-ish, I tried to watch a full movie length with this and the comfort is good due to the design of its foam and head band, the weight is very light only 170 gram and the foam is not leather, the driver is put in such an angle toward into our ear, so it does not have a pressure to our ear.

The cable of this headphone is the best in my collection so far, the right length for listening to portable during travel, I do NOT like the Audio Technica M50s/LE cable because very long and very heavy also it is better compare to the cable for Sennheiser HD 202 which is quite long and a little bit thinner.

I thought that the value of just $13 of this open-back headphone is nothing compare to the quality of the sound and the built of this headphone. A few days later I bought another one to give to friend .. ;-)

The spec from Sony:

Driver Unit : Open supra-aural, Dynamic 40 mm, dome type (CCAW Voice Coil)
Frequency Response : 12 - 22,000 Hz
Impedance : 40 ohms at 1 kHz
Sensitivity (db) : 100 dB/mW
Power Handling Capacity : 1000 mW
Design : Over-the-head, Monitor
Diaphragm : PET
Headband : Wide, Adjustable
Magnet : Ferrite
Plug : Stereo mini plug
Cord : 78 3/4 in. (2 m) Y-type
Weight (Approx.) : 6 oz (170 g) without cord

Sony MDR-MA100
Falling in love with the world

Write : 2013-07-08 13:54:44
Last edit : 2013-07-08 14:18:44

Harry
Harry
Total thread: 131
Total reply: 50

Post #83
Sony MDR-MA100, with cotton and other material inside
Reply #1
I tried to convert this open-back headphone to close-back headphone, I put some damping material such as cottons and some plastic bubble wrapper inside behind the driver, the result is no sound leak from the back of the driver at all BUT the sound still leak from the side of the ear, which I can not do much about it .. :-(

After the conversion, the bass is more powerful and solid, the same result like after I converted the Sennheiser HD 238 from open back to close back, in both cases I did not feel any other sound signature changes other than more bass impact, maybe because I can hear to sound frequency over 15Khz, I use iPhone 3GS with Signal Generator application which can generate many fixed frequency and 15Khz is my limit with this Sony MDR-MA100 and Sony XB30EX.

Sony MDR-MA100, with cotton and other material inside
Falling in love with the world

Write : 2013-07-08 14:10:48

Harry
Harry
Total thread: 131
Total reply: 50

Post #84
Sony MDR-MA100, with cotton inside of the foam
Reply #2
I put some cotton inside the foam to make this over-the-ear headphone cup larger to make the driver more far away to my ear, originally it is touching my ear but even after I shovelled-in some cottons the driver still touching my ear but it is more comfortable than without.

Sony MDR-MA100, with cotton inside of the foam
Falling in love with the world

Write : 2013-07-08 14:16:58

Harry
Harry
Total thread: 131
Total reply: 50

Post #85
Sony MDR-MA100, the driver inside
Reply #3
This 40 mm driver is quite large but unfortunately it does looks cheap to me, I do not know why there is a big hump with (also has an air hole in the middle) at the back of the driver, this design is the first I see of any headphone driver (maybe I need to see more headphone ;-P), if I may speculate then the hump must be some sort of magnet housing for the driver just like a conventional home speaker which has a large magnet at the back, but it seem the weight is quite light, at one time I really want to open the hump housing just to see what is inside but I rather not break this driver, so I just leave them alone and just continuing enjoy the music from this headphone.

Sony MDR-MA100, the driver inside
Falling in love with the world

Write : 2013-07-08 14:27:23

Harry
Harry
Total thread: 131
Total reply: 50

Post #86
Sony MDR-MA100, the stuffing
Reply #4
I use the same cotton like in Sennheiser HD 238, spread across the back panel then put a layer of plastic bubble wrapper directly behind the driver.

The bass is definitely improved and still solid and fast, it does NOT bleed into mid.

I definitely recommend all cheap open-back headphone to get the same treatment to close the back just to get more bass ... lol

Sony MDR-MA100, the stuffing
Falling in love with the world

Write : 2013-07-08 14:31:05

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