In depth comparison and review of Sennheiser HD 4.40 and Poly Savi 8240-M D2. 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 | Sennheiser HD 4.40 | Poly Savi 8240-M D2 |
|---|
| Product Type | Headphones - Bluetooth - wireless - NFC | Headset |
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| SOUND QUALITY | Sennheiser HD 4.40 | Poly Savi 8240-M D2 |
|---|
| Headphones Form Factor | Full size | - | |
|---|---|---|---|
| Ear Cups Type | Closed | - | |
| Connectivity Technology | Wireless | - | |
| Wireless Technology | Bluetooth | - | |
| Bluetooth Version | Bluetooth 4.0 | - | |
| Sound Output Mode | Stereo | - | |
| Frequency Response | 18 - 22000 Hz | - | |
| Total Harmonic Distortion (THD) | 0.5% | - | |
| Sensitivity | 113 dB | - | |
| Impedance | 18 Ohm | - |
| MICROPHONE | Sennheiser HD 4.40 | Poly Savi 8240-M D2 |
|---|
| Form Factor | Built-in | - | |
|---|---|---|---|
| Microphone Operation Mode | Omni-directional | - | |
| Frequency Response | 100 - 10000 Hz | - | |
| Microphones Included | 2 | - |
| BATTERY AND CHARGING | Sennheiser HD 4.40 | Poly Savi 8240-M D2 |
|---|
| Battery Type | Headphone battery lithium polymer | - |
|---|
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