Detailed comparison and review of Sennheiser CX 400BT and KEF Mu3. With our comprehensive overview, you can simply compare design, sound quality, but also other key features of both headphones and easily decide which ones are the right choice for you. Our goal is to help you identify the main differences between products and find the headphones that best fit your needs and expectations.
DESIGN AND DIMENSIONS | Sennheiser CX 400BT | KEF Mu3 |
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Product Type | True wireless earphones - Bluetooth - wireless | True wireless earphones - Bluetooth - wireless | |
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Dimensions & Weight Details | Earbud: 6 g Charging case: 37 g |
Earbud: 1.75 cm x 2.63 cm x 2.45 cm / 5.8 g Charging case: 6.2 cm x 5.2 cm x 3.35 cm / 46.8 g |
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Colour | White | Black | Silver grey | |
Protection | - | Splashproof | |
Recommended Use | Portable electronics | Portable electronics | |
Bluetooth Range (Operating Distance) | - | 10 m |
SOUND QUALITY | Sennheiser CX 400BT | KEF Mu3 |
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Headphones Form Factor | In-ear | In-ear | |
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Headphones Technology | Dynamic | - | |
Connectivity Technology | Wireless | Wireless | |
Wireless Technology | Bluetooth | Bluetooth | |
Bluetooth Version | Bluetooth 5.1 | Bluetooth 5.0 | Sennheiser CX 400BT have a more advanced version of Bluetooth than KEF Mu3. |
Bluetooth Profiles | Hands-Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | - | |
Bluetooth Audio Codec | SBC, AAC, aptX | SBC, AAC | |
Active Noise Cancelling | - | Yes | KEF Mu3 are equipped with active noice cancellation. |
Sound Output Mode | Stereo | Stereo | |
Frequency Response | 5 - 21000 Hz | 20 - 20000 Hz | Sennheiser CX 400BT offer a larger frequency range than KEF Mu3. |
Max Input Power | - | 5 mW | |
Total Harmonic Distortion (THD) | 0.08% | - | |
Sensitivity | - | 104 dB/mW | |
Impedance | - | 16 Ohm | |
Max Sound Pressure | 107 dB | - | |
Diaphragm | 7 mm | 8.2 mm | KEF Mu3 have a thicker diaphragm than Sennheiser CX 400BT. |
MICROPHONE | Sennheiser CX 400BT | KEF Mu3 |
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Form Factor | Built-in | Built-in |
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REMOTE CONTROL | Sennheiser CX 400BT | KEF Mu3 |
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Controls | Volume control, answer/end, play/pause, next/previous track, reject call, pair mode, voice assistant, equaliser preset | Multiple function button |
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CABLE | Sennheiser CX 400BT | KEF Mu3 |
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Cable Type | USB-C to USB-A cable - detachable - straight - 25 cm | - |
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FEATURES | Sennheiser CX 400BT | KEF Mu3 |
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Features | Voice alerts, touch control | - | |
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Intelligent Assistant | Siri, Google Assistant | - |
BATTERY AND CHARGING | Sennheiser CX 400BT | KEF Mu3 |
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Battery Type | Headphone battery rechargeable - Lithium Ion | Headphone battery rechargeable - Lithium Ion | |
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Battery Capacity | 55 mAh | 50 mAh | Sennheiser CX 400BT have a higher battery capacity than KEF Mu3. |
Battery Life | 7 hour(s) | 9 hour(s) | KEF Mu3 lasts longer on a single charge than the Sennheiser CX 400BT. |
Battery Life Details | Continuous playback (50% volume): up to 7 hours Continuous playback (with included charging case): up to 20 hours |
Continuous playback (noise cancelling ON): up to 9 hours Continuous playback (with included charging case): up to 24 hours |
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Charging Time | 1.5 hour(s) | - | |
Included Qty | 2 | 2 |
WIRELESS LINK | Sennheiser CX 400BT | KEF Mu3 |
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Radio Transmitter Power | 10 mW | - |
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OTHERS | Sennheiser CX 400BT | KEF Mu3 |
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Included Accessories | 4 pairs of earpads (extra small, small, medium, large), charging case (420 mAh) | 4 pairs of silicone ear tips, USB-C charging cable, charging case (350 mAh) | |
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Compliant Standards | Bluetooth Class 1, Directive 2006/66/EC, WEEE 2012/19/EU, Directive 2013/56/EU | IPX5 |