In depth comparison and review of JVC HA FX39BT Marshmallow and JBL Under Armour Project Rock True Wireless X. 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 | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Product Type | Earphones - Bluetooth - wireless | True wireless earphones - Bluetooth - wireless | |
|---|---|---|---|
| Weight | 28 g | - | |
| Colour | Green | White | Black | Black | |
| Protection | - | Waterproof, sweat-resistant, IPX7 | |
| Design | - | Sports | |
| Recommended Use | Portable electronics | Portable electronics |
| SOUND QUALITY | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Headphones Form Factor | In-ear - behind-the-neck mount | In-ear | |
|---|---|---|---|
| Connectivity Technology | Wireless | Wireless | |
| Wireless Technology | Bluetooth | Bluetooth | |
| Bluetooth Version | Bluetooth 3.0 | Bluetooth 5.0 | JBL Under Armour Project Rock True Wireless X have a more advanced version of Bluetooth than JVC HA FX39BT Marshmallow. |
| Bluetooth Profiles | Hands-Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | Hands-Free Profile (HFP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | |
| Bluetooth Audio Codec | SBC | - | |
| Noise Isolating | Yes | Yes | Both headphones are equipped with noise isolation. |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 20 - 20000 Hz | 20 - 22000 Hz | JBL Under Armour Project Rock True Wireless X offer a larger frequency range than JVC HA FX39BT Marshmallow. |
| Sensitivity | - | 96 dB/mW | |
| Impedance | - | 14 Ohm | |
| Max Sound Pressure | - | 96 dB | |
| Diaphragm | 8.5 mm | 5.8 mm | JVC HA FX39BT Marshmallow have a thicker diaphragm than JBL Under Armour Project Rock True Wireless X. |
| Magnet Material | Neodymium | - | |
| Features | - | TalkThru technology, JBL Charged Sound, Ambient Aware |
| MICROPHONE | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Form Factor | Built-in | Built-in | |
|---|---|---|---|
| Sensitivity | - | -25 dBV/Pascal |
| REMOTE CONTROL | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Controls | Volume control, play/pause, next/previous track | - |
|---|
| CABLE | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Cable Type | USB charge cable | USB-C charge cable - detachable |
|---|
| BATTERY AND CHARGING | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Battery Type | Headphone battery rechargeable | 2 x headphone battery rechargeable - lithium polymer | |
|---|---|---|---|
| Battery Capacity | - | 120 mAh | |
| Battery Life | 14 hour(s) | 10 hour(s) | JVC HA FX39BT Marshmallow lasts longer on a single charge than the JBL Under Armour Project Rock True Wireless X. |
| Battery Life Details | - | Continuous talk: up to 10 hours Continuous playback: up to 10 hours Continuous playback (with included charging case): up to 50 hours |
|
| Charging Time | 3 hour(s) | 2 hour(s) | JBL Under Armour Project Rock True Wireless X recharge faster than JVC HA FX39BT Marshmallow. |
| Included Qty | - | 2 |
| CONNECTIONS | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Connector Type | Bluetooth USB |
- |
|---|
| OTHERS | JVC HA FX39BT Marshmallow | JBL Under Armour Project Rock True Wireless X |
|---|
| Included Accessories | 2 pairs of ear tips (small, medium) | Carrying case, 3 pairs of ear tips, 3 pairs of EarFins, sticker, USB-C charging cable, charging case (1500 mAh) | |
|---|---|---|---|
| Software Included | - | MapMyRun premium membership (12 months) | |
| Compatibility | iPhone, iPad, iPod, Android phone | - | |
| Compliant Standards | - | IPX7 |
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