Shrikant Pendharkar was kind enough to share with us his opinions on the Audio-Technica ATH-CKX9iS Sonic Fuel In-Ear Earphones.
Just one word Excellent. Design is unique C tips. The box contents are generous. Silicon earpieces, Comfy foam earpieces (Real treat) and C tips of various sizes, Remote control with microphone on 1.2m Y type flat cord and 3.5 MM gold plated stereo 4 pin L shaped mini plug along with a nice carrying case. The care taken by the manufacturer is evident from the moment you start unboxing. Overall build quality is very good. The box contents are as complete as one can get. Full marks. It's lightweight and very comfortable to wear. My only complaint is missing of attaching pin for garment. This for me is important omission as the headphone are dangling from your ear and due to gravity and motion, entire the weight invariable falls on earpieces when used while walking or any activity. As a result within an year or two, one of the wires from earphone invariably gets detached. I have to through away one Bose, one Monster and many other earphones when one of the wire at the ear got loosened. But this my first earphone with flat cord, so only time can tell. But I strongly feel that for in ear headphones, a cloth attaching pin is very important for longevity.
I primarily listen music from my BlackBerry Z10 which has excellent audio and Cowon C2 which has probably best sound processing engine. I also own FiiO X1 HR audio DAP & FiiO Kilimanjaro 2 E11K amp. Frankly I did not find any significant gain or enhancement by using FiiO Kilimanjaro 2 amp along with Sonic Fuel or directly with Z10 or Cowon C2. I also have Audio-Technica ATH-M20X Over the Ear headphones. It's the wonderful, warm sound of these headphone which biased me towards Sonic Fuel.
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