The FiiO GIGAS 1 (also spelled GIGA S1) is a compact desktop headphone amplifier, branded JadeAudio, rated up to 4,600mW + 4,600mW balanced on a 12V USB PD supply, with 4.4mm and 3.5mm outputs and RCA/3.5mm inputs. FiiO built it for planar headphones like the JT7 and other hard-to-drive cans fed from a DAC or player.
Who the FiiO GIGAS 1 is for
FiiO JT7 and entry-level planar owners: FiiO created the GIGAS series because the JT7 needs more power than most affordable sources deliver, and aims it at entry-level planars from FiiO and other brands.
High-impedance and low-sensitivity headphones: Switch to high gain, which FiiO recommends for low-sensitivity or high-impedance headphones, and run it from a 12V USB PD charger for the most output.
Balanced cable owners: The 4.4mm balanced jack carries the 4,600mW-per-channel rating, and the 3.5mm and 4.4mm outputs can be used at the same time.
Gamers and callers with a TRRS headset: Plug a CTIA headset into the front 3.5mm jack and its mic passes through to the rear 3.5mm input, provided the source on that input also supports a CTIA mic.
Crowded desks: At about 132 × 60 × 40mm and 210g it fits beside a monitor stand, and it takes any analog source over RCA or 3.5mm, one input at a time.
Skip it if: you don't already have a DAC, dongle or other analog source: it has no DAC or USB audio input, and its USB port only takes power.
FiiO GIGAS 1 key specs
Type: Analog desktop headphone amplifier (no DAC)
Circuit: Discrete Class AB, op-amp + transistor current amplification (onsemi MJE243G/MJE253G)
Output power: Up to 4,600mW + 4,600mW balanced (high gain, 12V USB PD)
Headphone outputs: 4.4mm balanced; 3.5mm single-ended with CTIA mic passthrough (both usable at once)
Inputs: RCA and 3.5mm line in (one at a time)
Gain: High / low switch
Power input: USB-C, 5V/2A or 12V USB PD; USB cable included, no adapter
Dimensions: About 132 × 60 × 40mm (without feet)
Weight: About 210g
Genuine FiiO stock, 1-year warranty, free shipping on every order and 45-day returns.
FiiO GIGAS 1 vs similar options
vs Fosi Audio K5 PRO: A DAC/amp for PS5, Switch and PC with USB-C, optical and coaxial inputs and a mic input, but only a 3.5mm headphone jack; pick the GIGAS 1 for 4.4mm balanced output.
vs Fosi Audio SK02: Also has 3.5mm and 4.4mm outputs but adds an ES9038Q2M DAC with USB and optical inputs instead of analog ones; pick it for a computer, the GIGAS 1 for analog sources.
vs Fosi Audio SK01: Battery-powered (up to 6 hours) with bass, mid and treble knobs and a PURE bypass, but no 4.4mm or RCA jacks; pick the GIGAS 1 for balanced headphones on a desk.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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