CX 400BT: Sennheiser wants to play in the midfield (for once)
The German manufacturer of audio technology Sennheiser is known for exceptional sound quality and hefty prices. The latter are justified in most cases. To what extent price and performance are coherent in the CX 400BT wireless in-ears, we will get to the point in this review.
The CX 400BT are not meant to be a “cheap” copy of the MOMENTUM earphones, which are the flagships of the traditional company and are always at the top in terms of performance. Rather, Sennheiser has created a product that can meet the high expectations, but should play in the midfield in terms of price. It’s self-explanatory that some compromises had to be made.
We put the Sennheiser CX 400BT, the newest member of the wireless audio family, to the test to find out what the trade-offs are, and whether they are worth the money. Minor spoiler: We found that Sennheiser can never disappoint in terms of sound – even for 125 euros.
Technical data
| Design | In-ear with touch control |
| Driver | 7 mm dynamic driver |
| Frequency response | 5 – 21,000 Hz |
| Tone distortion at 1 kHz | <0.08% (1 kHz = 94 dB) |
| Frequency response (microphone) | 100 to 10,000 Hz |
| Battery life | Up to 7 hours with music playback / Up to 20 hours music playback with charging box |
| Charge time | 1.5 hours for full charge / 10 minutes for 1 hour |
| Connection | Bluetooth 5.1 |
| Audio codecs | SBC, ACC, aptX |
| Connection | USB-C |
| Compatibility | iOS, Android |
| Dimension (box) | 59 x 33.8 x 42.3 mm |
| Weight | 49 g (total) / 6 g (one headphone) |
| Material | Plastic / silicone (ear adapter) |
| Colors | Black, White |
| Price | € 99.00* |
What’s inside
The CX 400BT delivers Sennheiser in a narrow, inconspicuous packaging, which can be found with a different name on it numerous in electronics stores. But it’s the inside that counts in this test as well.
Unpacked, we find the in-ears in the designated case, which also serves as a charging station. In addition, the scope of delivery is supplemented by four ear adapters in sizes XS, S, M and L; which pretty much covers every ear type. The package also includes the USB charging cable and, of course, the obligatory manual.
In the end, it contains what is to be expected – nothing more, nothing less.
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Sennheiser CX 400BT True Wireless Earbuds price comparison
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