In depth comparison and review of EPOS I SENNHEISER IMPACT MB 660 UC and Poly Blackwire C725-UC. 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 | Poly Blackwire C725-UC |
|---|
| Product Type | Headset - Bluetooth - wireless - NFC - USB, 3.5 mm jack | Headset - wired - USB | |
|---|---|---|---|
| Series | - | 700 Series | |
| Weight | 227 g | - | |
| Recommended Use | Portable electronics, computer | Computer | |
| Bluetooth Range (Operating Distance) | 25 m | - |
| SOUND QUALITY | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
|---|
| Headphones Form Factor | Full size | On-ear | |
|---|---|---|---|
| Headphones Technology | Dynamic | - | |
| Ear Cups Type | Closed | - | |
| Foldable | Yes | - | EPOS I SENNHEISER IMPACT MB 660 UC can be folded. |
| Connectivity Technology | Wireless | Wired | |
| Wireless Technology | Bluetooth | - | |
| Bluetooth Version | Bluetooth 4.2 | - | |
| 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 | Yes | Both headphones are equipped with active noice cancellation. |
| Active Noise Cancelling Technology | NoiseGard active noise compensation | SoundGuard | |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 17 - 23000 Hz | 20 - 20000 Hz | EPOS I SENNHEISER IMPACT MB 660 UC offer a larger frequency range than Poly Blackwire C725-UC. |
| Total Harmonic Distortion (THD) | <0.5% | - | |
| Sensitivity | 118 dB | - | |
| Impedance | 46 Ohm | - | |
| In-Cord Volume Control | - | Yes |
| MICROPHONE | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
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| Form Factor | Built-in | Headset microphone | |
|---|---|---|---|
| Type | - | Boom | |
| Frequency Response | 150 - 6800 Hz | 100 - 8000 Hz | Poly Blackwire C725-UC offer a larger microphone frequency range than EPOS I SENNHEISER IMPACT MB 660 UC. |
| Microphones Included | 3 | - |
| REMOTE CONTROL | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
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| Controls | - | Mute, volume, answer/end |
|---|
| CABLE | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
|---|
| Cable Type | Audio cable Micro-USB cable |
USB cable - 2.04 m | |
|---|---|---|---|
| Cable Length | - | 2.04 m |
| BATTERY AND CHARGING | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
|---|
| Battery Type | Headset battery rechargeable - 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 | Poly Blackwire C725-UC |
|---|
| Transmission Range | 25 m | - |
|---|
| CONNECTIONS | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
|---|
| Connector Type | - | USB (4 PIN USB Type A) |
|---|
| OTHERS | EPOS I SENNHEISER IMPACT MB 660 UC | Poly Blackwire C725-UC |
|---|
| Included Accessories | Carrying case, Bluetooth adapter, airplane adapter | Carrying case | |
|---|---|---|---|
| Service & Support | Limited warranty - 2 years | Limited warranty - 2 years |
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