Introduction
Sennheiser is a German company that specializes in a wide range of audio products from in-ear monitors (IEMs) to speakers. In this review, I will be reviewing the IE 40 Pro. I would like to thank Sennheiser for the review unit of the IE 40 Pro. At the moment, you can purchase the IE 40 Pro from Sennheiser .
Specifications
- Driver Configuration: 10mm Dynamic
- Impedance: 20 Ohm
- Frequency Response: 20 – 18,000 Hz
- Sound Pressure Level: 115 dB (1kHz / 1 Vrms)
- THD, total harmonic distortion: < 0.1 % (1kHz, 94dB)
Unboxing & Accessories
The IE 40 Pro comes in a package that sports image of the iem, brand name and model name. After opening the package, there are the IE40 Pro, 3 pairs of silicone tips (S, M, L), 1 pair of foam tips (M), soft pouch, cleaning tool and instruction manual.
Page 2: IEM Build & Design, Cable Build & Design
Audio123 Reviews 
How does this compare with the Tanchjim Oxygen?
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The IE40 Pro has a leaner presentation than the Oxygen and it is sharper sounding.
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ie40 pro vs. tfz no.3?
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IE 40 Pro has a leaner presentation and the midrange is less forward than the No.3. Cheers!
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Hi, how do these fare compared to Chinese iems such as Tin T4?
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The IE 40 Pro is superior to the T4. Cheers!
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