The FiiO QX11 is a compact, high-output USB DAC/headphone amplifier designed to bridge portable Hi-Fi and gaming use. Measuring approximately 64 × 28.8 × 13 mm and weighing only 36 g, it uses dual flagship ESS ES9069Q DACs and FiiO’s SPV5068 USB audio processor, with dual TI OPA1692 op-amps and four OPA1622 amplifier chips. It supports up to 768 kHz/32-bit PCM and native DSD512, with both 3.5 mm single-ended and 4.4 mm balanced outputs. Output capability is particularly strong for its size: in Desktop Mode, the balanced output reaches up to 800 mW + 800 mW at 32 Ω, while the 3.5 mm output delivers up to 295 mW + 295 mW at 32 Ω.

It features a 1.14-inch color LCD showing sampling rate, gain, volume, EQ and other settings, a physical multifunction volume/encoder knob, and a customizable shortcut button. A built-in microphone with AI environmental-noise cancellation supports calls and voice chat, and the QX11 has dual USB-C ports, including a dedicated power input capable of up to 45 W USB-PD charging for compatible devices. FiiO also provides a dedicated Desktop Mode that increases available amplifier power when external power is connected.