In depth comparison and review of EPOS I SENNHEISER IMPACT MB 660 UC and Sennheiser HD 4.40. 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 | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
|---|
| Product Type | Headset - Bluetooth - wireless - NFC - USB, 3.5 mm jack | Headphones - Bluetooth - wireless - NFC | |
|---|---|---|---|
| Weight | 227 g | - | |
| Recommended Use | Portable electronics, computer | - | |
| Bluetooth Range (Operating Distance) | 25 m | - |
| SOUND QUALITY | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
|---|
| Headphones Form Factor | Full size | Full size | |
|---|---|---|---|
| Headphones Technology | Dynamic | - | |
| Ear Cups Type | Closed | Closed | |
| Foldable | Yes | - | EPOS I SENNHEISER IMPACT MB 660 UC can be folded. |
| Connectivity Technology | Wireless | Wireless | |
| Wireless Technology | Bluetooth | Bluetooth | |
| Bluetooth Version | Bluetooth 4.2 | Bluetooth 4.0 | EPOS I SENNHEISER IMPACT MB 660 UC have a more advanced version of Bluetooth than Sennheiser HD 4.40. |
| Bluetooth Profiles | Hands-Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP), Device ID Profile (DIP) | - | |
| Bluetooth Audio Codec | SBC, aptX | - | |
| Active Noise Cancelling | Yes | - | EPOS I SENNHEISER IMPACT MB 660 UC are equipped with active noice cancellation. |
| Active Noise Cancelling Technology | NoiseGard active noise compensation | - | |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 17 - 23000 Hz | 18 - 22000 Hz | EPOS I SENNHEISER IMPACT MB 660 UC offer a larger frequency range than Sennheiser HD 4.40. |
| Total Harmonic Distortion (THD) | <0.5% | 0.5% | Both headphones have the same total harmonic distortion. |
| Sensitivity | 118 dB | 113 dB | EPOS I SENNHEISER IMPACT MB 660 UC have higher sensitivity than Sennheiser HD 4.40. |
| Impedance | 46 Ohm | 18 Ohm |
| MICROPHONE | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
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| Form Factor | Built-in | Built-in | |
|---|---|---|---|
| Microphone Operation Mode | - | Omni-directional | |
| Frequency Response | 150 - 6800 Hz | 100 - 10000 Hz | Sennheiser HD 4.40 offer a larger microphone frequency range than EPOS I SENNHEISER IMPACT MB 660 UC. |
| Microphones Included | 3 | 2 | EPOS I SENNHEISER IMPACT MB 660 UC have a built-in microphone. |
| CABLE | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
|---|
| Cable Type | Audio cable Micro-USB cable |
- |
|---|
| BATTERY AND CHARGING | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
|---|
| Battery Type | Headset battery rechargeable - lithium polymer | Headphone battery lithium polymer | |
|---|---|---|---|
| Battery Capacity | 700 mAh | - | |
| Battery Life | 30 hours | - | |
| Standby Time | 360 hours | - | |
| Charging Time | 3 hours | - |
| WIRELESS LINK | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
|---|
| Transmission Range | 25 m | - |
|---|
| OTHERS | EPOS I SENNHEISER IMPACT MB 660 UC | Sennheiser HD 4.40 |
|---|
| Included Accessories | Carrying case, Bluetooth adapter, airplane adapter | - | |
|---|---|---|---|
| Service & Support | Limited warranty - 2 years | - |
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