In depth comparison and review of Poly Blackwire 325-M and Bang & Olufsen Beoplay H4. 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-M | Bang & Olufsen Beoplay H4 |
|---|
| Product Type | Headset - wired - USB, 3.5 mm jack | Headphones - Bluetooth - wireless - 3.5 mm jack | |
|---|---|---|---|
| Series | 300 Series | - | |
| Height | - | 22 cm | |
| Width | - | 19.4 cm | |
| Depth | - | 5 cm | |
| Weight | - | 235 g | |
| Colour | - | Black | Charcoal grey | Sandstone | Tangerine | Violet | |
| Body Material | - | Stainless steel, aluminium | |
| Earpad Material | - | Leather | |
| Headband Material | Metal | Leather | |
| Recommended Use | - | Portable electronics | |
| Bluetooth Range (Operating Distance) | - | 10 m |
| SOUND QUALITY | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Headphones Form Factor | On-ear | Full size | |
|---|---|---|---|
| Headphones Technology | - | Dynamic | |
| Ear Cups Type | - | Closed | |
| Adjustable Headband | - | Yes | |
| Connectivity Technology | Wired | Wireless | |
| Wireless Technology | - | Bluetooth | |
| Bluetooth Version | - | Bluetooth 4.2 | |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 20 - 20000 Hz | 20 - 22000 Hz | Bang & Olufsen Beoplay H4 offer a larger frequency range than Poly Blackwire 325-M. |
| Sensitivity | - | 91 dB/mW | |
| Impedance | - | 20 Ohm | |
| Diaphragm | - | 40 mm | |
| Features | SoundGuard Technology | - | |
| In-Cord Volume Control | Yes | - |
| MICROPHONE | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Form Factor | - | Built-in | |
|---|---|---|---|
| Type | Boom | - | |
| Microphone Technology | - | Electret condenser | |
| Microphone Operation Mode | - | Omni-directional | |
| Frequency Response | 100 - 10000 Hz | - | |
| Audio Input Details | - | Omni-directional |
| REMOTE CONTROL | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
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| Controls | Mute, volume, answer/end | Volume, answer/end, play/pause, next/previous track, pair mode |
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| CABLE | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
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| Cable Type | Headset cable - 2.13 m | Headphones cable - braided fabric - 1.25 m | |
|---|---|---|---|
| Cable Length | 2.13 m | 1.25 m |
| FEATURES | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Additional Functions | DSP | - |
|---|
| BATTERY AND CHARGING | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Battery Type | - | Headphone battery rechargeable - Lithium Ion | |
|---|---|---|---|
| Battery Capacity | - | 600 mAh | |
| Battery Life | - | 19 hour(s) | |
| Charging Time | - | 2.5 hour(s) |
| WIRELESS LINK | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Transmission Range | - | 10 m |
|---|
| CONNECTIONS | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Connector Type | USB (4 PIN USB Type A) Headphones (mini-phone 3.5 mm 4-pole) |
Headphones (mini-phone 3.5mm) |
|---|
| OTHERS | Poly Blackwire 325-M | Bang & Olufsen Beoplay H4 |
|---|
| Included Accessories | - | USB charging cable (25cm) | |
|---|---|---|---|
| Service & Support | Limited warranty - 2 years | Limited warranty - 2 years |
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