FiiO GIGAS 1 Compact Desktop Headphone Amplifier Black

The FiiO GIGAS 1 is a compact desktop headphone amplifier with a discrete Class AB transistor output stage, delivering up to 4600mW + 4600mW balanced. With 4.4mm balanced and 3.5mm outputs, RCA and 3.5mm inputs, two gain levels and USB-C power (5V or 12V PD), it drives everything from sensitive IEMs to demanding planar and high-impedance headphones. This listing is the black finish.

Key specifications

• Amplifier: discrete Class AB, onsemi MJE243G x4 + MJE253G x4
• Output power: up to 4600mW + 4600mW (balanced)
• Outputs: 4.4mm balanced, 3.5mm single-ended with CTIA microphone passthrough
• Inputs: RCA and 3.5mm
• Supported headphone impedance: 8 to 350 ohms
• SNR: 118dB or more (A-weighted)
• Power: USB-C, 5V 2A or PD 12V 2A
• Dimensions and weight: 132 x 60 x 40mm (excluding feet), 210g

FiiO GIGAS 1 compact desktop headphone amplifier

The GIGAS 1 is a compact, high-power desktop headphone amplifier in an aluminium alloy chassis. It uses a discrete Class AB op-amp and transistor current-amplification circuit, delivering a balanced output of up to 4600mW + 4600mW. It suits a wide range of IEMs and full-size headphones, and pairs well with source equipment such as the FiiO K15 Desktop DAC and Headphone Amplifier if you need a DAC stage alongside it.

Class AB discrete transistor current amplification

The op-amp and transistor current-amplification design uses onsemi MJE243G/253G transistors to achieve high-current, low-impedance output. Balanced output power reaches up to 4600mW + 4600mW, driving full-size headphones and IEMs with a smooth, natural sound.

Dual headphone outputs

A 3.5mm single-ended output and a 4.4mm balanced output cover a wide range of headphone terminations. The 3.5mm jack supports CTIA microphone passthrough for gaming voice chat, calls and multimedia use.

Dual input ports

Both 3.5mm and RCA inputs are included, accepting digital audio players, smartphones, computers and CD players. The GIGAS 1 is well matched with portable sources such as the FiiO M21 DAP.

Two adjustable gain levels

A toggle switch selects high or low gain. Low gain suits high-sensitivity IEMs; high gain accommodates low-sensitivity planar and high-impedance full-size headphones.

USB-C dual-mode power supply

The USB-C port accepts standard 5V 2A or PD 12V 2A power, switching automatically between modes. A computer or standard 5V adapter is enough to drive most headphones; a 12V PD supply fully unlocks the amplifier's output power, dynamics and soundstage.

Minimalist design and easy control

The compact aluminium alloy chassis fits into small desktop setups. An oversized volume knob and mechanical toggle switches keep operation simple straight out of the box.

Multiple colour options

The GIGAS 1 is available in multiple colours. The anodised aluminium alloy chassis has a finely textured finish paired with a warm retro lighting effect, suitable for minimalist workspaces, vintage setups and gaming rigs alike.