In depth comparison and review of Erato RIO 3 and Sennheiser CX 400BT. Compare design, audio features, functions and other important specifications to easily choose the right headphones for you. Our goal is to help you uncover differences between the products and find the headphones that will best fit your needs.
| DESIGN AND DIMENSIONS | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Product Type | True wireless earphones - Bluetooth - wireless | True wireless earphones - Bluetooth - wireless | |
|---|---|---|---|
| Height | 4.6 cm | - | |
| Width | 5.1 cm | - | |
| Depth | 3.4 cm | - | |
| Weight | 14 g | - | |
| Dimensions & Weight Details | - | Earbud: 6 g Charging case: 37 g |
|
| Colour | Yellow | Black | Turquoise | Green | Red | Silver | White | Black | |
| Protection | Sweat-resistant, IPX5, water-resistant | - | |
| Recommended Use | Portable electronics | Portable electronics | |
| Bluetooth Range (Operating Distance) | 10 m | - |
| SOUND QUALITY | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Headphones Form Factor | In-ear | In-ear | |
|---|---|---|---|
| Headphones Technology | - | Dynamic | |
| Connectivity Technology | Wireless | Wireless | |
| Wireless Technology | Bluetooth | Bluetooth | |
| Bluetooth Version | Bluetooth 4.2 | Bluetooth 5.1 | Sennheiser CX 400BT have a more advanced version of Bluetooth than Erato RIO 3. |
| Bluetooth Profiles | Hands-Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | 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, aptX | |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 20 - 20000 Hz | 5 - 21000 Hz | Sennheiser CX 400BT offer a larger frequency range than Erato RIO 3. |
| Total Harmonic Distortion (THD) | - | 0.08% | |
| Sensitivity | 100 dB | - | |
| Impedance | 32 Ohm | - | |
| Max Sound Pressure | - | 107 dB | |
| Diaphragm | 14.2 mm | 7 mm | Erato RIO 3 have a thicker diaphragm than Sennheiser CX 400BT. |
| MICROPHONE | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Form Factor | Built-in | Built-in | |
|---|---|---|---|
| Microphone Operation Mode | Omni-directional | - | |
| Sensitivity | -38 dB | - |
| REMOTE CONTROL | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Controls | Volume, power on/off, answer/end, play/pause, next/previous track, pair mode | Volume control, answer/end, play/pause, next/previous track, reject call, pair mode, voice assistant, equaliser preset |
|---|
| CABLE | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Cable Type | - | USB-C to USB-A cable - detachable - straight - 25 cm |
|---|
| FEATURES | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Features | - | Voice alerts, touch control | |
|---|---|---|---|
| Intelligent Assistant | - | Siri, Google Assistant |
| BATTERY AND CHARGING | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Battery Type | Headphone battery rechargeable | Headphone battery rechargeable - Lithium Ion | |
|---|---|---|---|
| Battery Capacity | 130 mAh | 55 mAh | Erato RIO 3 have a higher battery capacity than Sennheiser CX 400BT. |
| Battery Life | 8 hour(s) | 7 hour(s) | Erato RIO 3 lasts longer on a single charge than the Sennheiser CX 400BT. |
| Battery Life Details | Continuous playback: up to 6 hours Continuous talk: up to 8 hours |
Continuous playback (50% volume): up to 7 hours Continuous playback (with included charging case): up to 20 hours |
|
| Charging Time | - | 1.5 hour(s) | |
| Included Qty | 2 | 2 |
| WIRELESS LINK | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Radio Transmitter Power | - | 10 mW |
|---|
| OTHERS | Erato RIO 3 | Sennheiser CX 400BT |
|---|
| Included Accessories | - | 4 pairs of earpads (extra small, small, medium, large), charging case (420 mAh) | |
|---|---|---|---|
| Compliant Standards | - | Bluetooth Class 1, Directive 2006/66/EC, WEEE 2012/19/EU, Directive 2013/56/EU |
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