Conversion falls to two ESS ES9219MQ, paired with an XMOS XU316 USB stage and a QCC5125 Bluetooth chip. The unit accepts up to 384 kHz at 32-bit and DSD256, and also works as an MQA renderer. The 0.96-inch OLED screen shows the incoming format and the settings.
The 3.5 mm single-ended socket delivers 125 milliwatts per channel into 32 ohms, the 4.4 mm balanced socket 340 milliwatts. Stated signal-to-noise ratios reach 120 and 122 dB. Accepted impedances run from 8 to 150 ohms single-ended and 8 to 350 ohms balanced. The shell measures 32 x 72.2 x 12.5 mm and weighs 37.3 grams.
Bluetooth 5.1 receives over SBC, AAC, aptX, aptX LL, aptX HD, aptX Adaptive and LDAC. A built-in omnidirectional microphone takes calls, and a car mode follows the vehicle USB switching on and off. The 550 mAh battery is rated for more than eight hours of listening, charging in two hours at most.
A mode button selects PC, BT or PHONE. In PC mode, the unit works as a USB DAC, powered by the computer. In BT mode, it receives over Bluetooth on its internal battery and recharges through the USB port. In PHONE mode, it connects to a phone as a USB DAC, still on its own battery.
Data sheet
Specific References
The FiiO FT13 is a closed-back over-ear headphone with amaranth wood ear cups, a 60 mm dynamic driver, and a W-shaped diaphragm, and is Hi-Res Audio certified.
FiiO LS-3.5B cable for earphones with 0.78 mm 2-pin connectors, with a microphone and in-line control button. Its 3.5 mm jack plug is L-shaped.
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