In depth comparison and review of Poly Blackwire 325 and JBL TUNE 520BT. 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 | JBL TUNE 520BT |
|---|
| Product Type | Headset - wired - USB, 3.5 mm jack | Headphones - Bluetooth - wireless | |
|---|---|---|---|
| Series | 300 Series | - | |
| Weight | - | 157 g | |
| Colour | - | Black | Purple | White | Blue | |
| Headband Material | Metal | - | |
| Recommended Use | - | Portable electronics |
| SOUND QUALITY | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Headphones Form Factor | On-ear | On-ear | |
|---|---|---|---|
| Headphones Technology | - | Dynamic | |
| Adjustable Headband | - | Yes | |
| Foldable | - | Yes | JBL TUNE 520BT can be folded. |
| Connectivity Technology | Wired | Wireless | |
| Wireless Technology | - | Bluetooth | |
| Bluetooth Version | - | Bluetooth 5.3 | |
| Bluetooth Profiles | - | Hands-Free Profile (HFP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | |
| Sound Output Mode | Stereo | Stereo | |
| Sound Effects | - | Pure Bass | |
| Frequency Response | 20 - 20000 Hz | 20 - 20000 Hz | Both headphones offer the same frequency response. |
| Sensitivity | - | 102 dB | |
| Impedance | - | 30 Ohm | |
| Max Sound Pressure | - | 95 dB | |
| Diaphragm | - | 33 mm | |
| Features | SoundGuard Technology | - | |
| In-Cord Volume Control | Yes | - |
| MICROPHONE | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Form Factor | - | Built-in | |
|---|---|---|---|
| Type | Boom | - | |
| Frequency Response | 100 - 10000 Hz | - | |
| Sensitivity | - | -29 dB |
| REMOTE CONTROL | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Controls | Mute, volume, answer/end | Volume |
|---|
| CABLE | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Cable Type | Headset cable - 2.13 m | USB-C cable | |
|---|---|---|---|
| Cable Length | 2.13 m | - |
| FEATURES | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Features | - | Multipoint Pairing, VoiceAware | |
|---|---|---|---|
| Internet of Things (IoT) Compatible | - | Yes | |
| Intelligent Assistant | - | Google Assistant ready, Siri ready | |
| Additional Functions | DSP | - |
| BATTERY AND CHARGING | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Battery Type | - | Headphone battery rechargeable - Lithium Ion | |
|---|---|---|---|
| Battery Capacity | - | 450 mAh | |
| Battery Life | - | 57 hour(s) | |
| Battery Life Details | - | Continuous playback (with 5 min charge): up to 3 hours | |
| Charging Time | - | 2 hour(s) |
| WIRELESS LINK | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Modulation Type | - | GFSK, 8-DPSK, 4-DQPSK | |
|---|---|---|---|
| Radio Frequency Range | - | 2.4 - 2.4835GHz |
| CONNECTIONS | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Connector Type | USB (4 PIN USB Type A) Headphones (mini-phone 3.5 mm 4-pole) |
- |
|---|
| OTHERS | Poly Blackwire 325 | JBL TUNE 520BT |
|---|
| Included Accessories | - | Charging cable | |
|---|---|---|---|
| Service & Support | Limited warranty - 2 years | - |
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