In depth comparison and review of Poly Blackwire 325 and Sennheiser HD 250BT. 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 | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Product Type | Headset - wired - USB, 3.5 mm jack | Headphones - Bluetooth - wireless | |
|---|---|---|---|
| Series | 300 Series | - | |
| Weight | - | 125 g | |
| Headband Material | Metal | - | |
| Recommended Use | - | Portable electronics |
| SOUND QUALITY | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Headphones Form Factor | On-ear | On-ear | |
|---|---|---|---|
| Headphones Technology | - | Dynamic | |
| Ear Cups Type | - | Closed | |
| Adjustable Headband | - | Yes | |
| Connectivity Technology | Wired | Wireless | |
| Wireless Technology | - | Bluetooth | |
| Bluetooth Version | - | Bluetooth 5.0 | |
| 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, apt-X LL | |
| Noise Isolating | - | Yes | Sennheiser HD 250BT are equipped with a noise isolating function. |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 20 - 20000 Hz | 20 - 22000 Hz | Sennheiser HD 250BT offer a larger frequency range than Poly Blackwire 325. |
| Total Harmonic Distortion (THD) | - | <0.3% | |
| Sensitivity | - | 110 dB | |
| Diaphragm | - | 32 mm | |
| Features | SoundGuard Technology | Audio prompts | |
| In-Cord Volume Control | Yes | - |
| MICROPHONE | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Form Factor | - | Built-in | |
|---|---|---|---|
| Type | Boom | - | |
| Microphone Technology | - | Electret condenser | |
| Microphone Operation Mode | - | Omni-directional | |
| Frequency Response | 100 - 10000 Hz | 100 - 10000 Hz | The frequency response of the microphones in both headphones is the same. |
| REMOTE CONTROL | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Controls | Mute, volume, answer/end | Volume, on/off, answer/end, hold, play/pause, next/previous track, reject call |
|---|
| CABLE | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Cable Type | Headset cable - 2.13 m | USB-C charge cable - detachable | |
|---|---|---|---|
| Cable Length | 2.13 m | - |
| FEATURES | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Additional Functions | DSP | - |
|---|
| BATTERY AND CHARGING | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Battery Type | - | Headphone battery rechargeable | |
|---|---|---|---|
| Battery Capacity | - | 190 mAh | |
| Battery Life | - | 25 hour(s) | |
| Charging Time | - | 3 hour(s) |
| CONNECTIONS | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Connector Type | USB (4 PIN USB Type A) Headphones (mini-phone 3.5 mm 4-pole) |
- |
|---|
| OTHERS | Poly Blackwire 325 | Sennheiser HD 250BT |
|---|
| Included Accessories | - | USB-C charging cable | |
|---|---|---|---|
| Compatibility | - | iPhone, Android phone | |
| Compliant Standards | - | Bluetooth Class 1 | |
| Service & Support | Limited warranty - 2 years | - |
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