JadeAudio GIGAS 1 Review: A Sub-$50 Amp That Makes No Sense (In A Good Way)

I'll be honest with you. When I saw "4.6 watts per channel" and "$49.99" in the same sentence, my first reaction wasn't excitement. It was suspicion.

That's not a review number, that's a fantasy number. You see specs like that from companies that "measure" power at 1kHz into a dead short with the THD limit turned off, and then quietly bury the real figure in a footnote nobody reads. So I plugged the GIGAS 1 in expecting to write a takedown. A gentle one, because it costs less than a decent dinner out, but a takedown nonetheless.

I did not get to write that review. And that annoys me a little, because a good takedown is more fun to write than a compliment.

What Is This Thing, Actually

The GIGAS 1 is JadeAudio's answer to a problem FiiO created for itself. When FiiO launched the JT7, its entry planar over-ear, they ran into the classic planar magnetic problem: low sensitivity, high current demand, and a market full of desktop amps that can actually drive that load but cost several times what the headphone does. So instead of telling JT7 buyers to go spend $300 on an amplifier, JadeAudio built one that costs a sixth of that.

The GIGAS 1 sits at the entry point of a three-model lineup. GIGAS 2 is the portable, battery-powered version with a removable cell. GIGAS 3 bolts a DAC onto the same amp section. The GIGAS 1 is the purist of the three: no DAC, no Bluetooth, no screen, nothing to distract from one job. You feed it a line-level signal, it amplifies it, that's the entire pitch.

And that's actually the first thing worth understanding about this product, because it explains almost everything else. This is not trying to be your source. It's not trying to be your DAC. It's a power stage, full stop, and every design decision downstream of that is in service of doing that one job as cleanly and as loudly as physically possible for fifty bucks.

The Guts

Inside is a Class AB discrete transistor current-amplification circuit, built around the classic onsemi MJE243G/MJE253G complementary pair. If that transistor combo sounds familiar, it should. It's the same pairing FiiO uses in the K17 and K17 R2R, their flagship desktop DAC/amps. That's not a coincidence, and it's worth sitting with for a second. The company took a topology proven in a $900 flagship and shrank the implementation down to fit a $50 chassis. Does that mean the GIGAS 1 sounds like a K17? No, and I'll get to why. But it does mean the DNA is legitimate, not a marketing department borrowing a buzzword.

Power scales with your USB-C PD supply, and this is where you need to pay attention before you buy. Plug in a basic 5V source and you're capped well below the headline number. Feed it a proper PD 12V adapter (not included, so budget for that separately) and in high gain you get up to 4600mW + 4600mW into 32 ohms balanced, or 1400mW single-ended. Into a punishing 300-ohm load, that drops to 740mW balanced and 185mW single-ended. Frequency response is rated 20Hz to 200kHz, THD sits at a genuinely low 0.00057% at 1V RMS into 300 ohms, and signal-to-noise is above 118dB.

Read those numbers again. This is not "good for the price." Strip the price tag off and those are just good numbers.

Connectivity is sensible and complete for what this is. Front panel has a 3.5mm single-ended out plus a 4.4mm balanced out, and the 3.5mm doubles as a CTIA mic pass-through, so gamers can run a headset with mic through it without a second cable running to the motherboard. Round back you get 3.5mm line-in and RCA in, covering DAPs, phones, PCs, and CD players alike. High/low gain toggle. Top-mounted volume knob that turns with a satisfying amount of resistance, not the loose, wobbly feel you sometimes get on budget gear. The whole thing weighs 210 grams and measures 132 x 60 x 40mm. It'll disappear next to a keyboard.

How It Actually Sounds

Here's where I have to be careful, because "power" and "sound quality" are not the same conversation, and cheap amps love to conflate the two.

I ran the GIGAS 1 through a range of material with a mix of loads, from sensitive IEMs on low gain up through the FiiO JT7 planar and a Hifiman Sundara, both of which are exactly the kind of headphone this amp exists for.

Start with something rhythmically demanding. Vulfpeck's "Back Pocket" has that tight, dry bass line that either locks in or turns to mush depending on how much control an amp actually has over the driver, versus just throwing voltage at it. The GIGAS 1 kept it tight. No bloom, no overhang, the note starts and stops when it's supposed to. That's the Class AB discrete circuit doing its job, current control rather than brute voltage.

Move to something more layered and take Fleet Foxes' "Helplessness Blues." Multiple vocal harmonies stacked with acoustic guitar and light percussion, and this is a good torture test for separation because it's easy for a cheap amp to smear those voices into one wide blob. The GIGAS 1 kept the layering intelligible. I could follow the individual vocal lines without straining, which honestly surprised me more than the bass control did.

Where I'll push back a little is the top end. Feed it something already a touch forward up top, Daft Punk's "Giorgio by Moroder" has a lot of hi-hat and synth shimmer riding high in the mix, and the GIGAS 1 doesn't tame that, it leans into it. It's not harsh. It's not sibilant in a way that made me wince. But the character is neutral-bright rather than warm or forgiving, and if your headphones already sit on the brighter side of neutral, this pairing will sound like two people agreeing loudly rather than balancing each other out.

Bring in the JT7 planar, the headphone this whole product line exists to serve, and things click into place. Radiohead's "Everything In Its Right Place" needs low-end extension and headroom without compression creeping in during the loudest synth swells, and on the 12V PD supply in high gain, the GIGAS 1 delivered that without strain. No sense of the amp running out of breath before the headphone does. That's the entire value proposition of this product working exactly as intended.

And honestly? For fifty dollars, that alone should be the headline. A budget amp that doesn't run out of power before your headphones do is rarer than it should be.

Comparisons And Where It Sits

The obvious comparison point in this exact price and power bracket is Topping's NX-series portable amps, which trade the GIGAS 1's raw output for battery portability and a slightly more forgiving tonal balance. If you need something in your pocket, that's a different use case entirely and the GIGAS 1 was never trying to compete there, it's a desk-bound device by design.

Closer to home, stack it mentally against JDS Labs' Atom amp, long treated as the budget reference point for clean, neutral desktop amplification. The Atom is the more tonally settled of the two, a hair smoother up top, but it doesn't touch the GIGAS 1's power reserves into demanding loads, not at anywhere near this price. If your headphone is easy to drive, the Atom's overall balance may suit you better. If you own or plan to own a genuine power-hungry planar, the GIGAS 1's headroom advantage becomes the deciding factor, not the tonal nuance.

Then there's the FiiO K7, sitting one rung up the ladder with a built-in DAC and considerably more connectivity, for roughly triple the price. That's not really a fair fight and I won't pretend it is. But it does frame what you're trading away by going with the GIGAS 1: you're giving up an integrated source entirely, which means you need a DAC or line-out somewhere else in your chain already. That's the real cost of this amp, not the fifty dollars on the price tag, but the fact you need something feeding it.

Best Synergy

Where this amp earns its keep is with anything power-hungry and reasonably neutral to begin with. The FiiO JT7 is the obvious pairing since it's the headphone that spawned the whole GIGAS lineup, and the two were clearly voiced with each other in mind. A Hifiman Sundara or 400-series planar is a similarly strong match, current-hungry enough to need the headroom, forgiving enough tonally to not clash with the amp's brighter lean.

Where I'd steer you away is pairing it with anything already tuned bright or thin up top. Something like a Sennheiser HD 600 or a warmer-leaning dynamic will balance the GIGAS 1's tonality nicely and give you a genuinely composed, full sound. But a bright planar or a treble-forward IEM run through the single-ended out on high gain risks turning fatiguing fast. Use low gain and a warmer headphone if your source material or your ears are already sensitive up top.

The Verdict

Here's the thing I keep coming back to. This is not a giant killer that quietly outperforms $500 amplifiers, and I'd be lying to you if I framed it that way. What it is, is an honest, competently engineered piece of gear that does exactly what it claims to do, for a price that makes almost no financial sense given what's inside it.

It won't replace a proper desktop DAC/amp combo if that's what you actually need. It's not trying to. But as a dedicated power stage for someone who already has a source and just needs enough clean current to wake up a planar headphone without remortgaging anything, the GIGAS 1 does that job better than a fifty dollar product has any right to.

I went in looking for the catch. I'm still not entirely sure I found one.

Pros

• Real measured performance backs up the low price: up to 4600mW + 4600mW balanced into 32 ohms (with a 12V PD supply), THD of 0.00057% at 1V RMS into 300 ohms, SNR above 118dB

• Uses a proven discrete Class AB topology (onsemi MJE243G/MJE253G pair), the same pairing found in FiiO's flagship K17 and K17 R2R

• Tight, controlled bass with no bloom or overhang on rhythmically demanding tracks

• Strong separation and layering on complex, multi-vocal material

• Plenty of headroom to properly drive power-hungry planars like the FiiO JT7 and Hifiman Sundara without running out of steam

• Complete, sensible connectivity for the price: 3.5mm/4.4mm balanced front outs, 3.5mm mic pass-through, 3.5mm and RCA line-in, high/low gain switch

• Solid build feel, including a volume knob with good resistance, and a compact footprint (132 x 60 x 40mm, 210g)

• Excellent value relative to competitors like the JDS Labs Atom, which can't match its power reserves into demanding loads at anywhere near the price

Cons

• Power output scales heavily with the USB-C PD adapter used, and a proper 12V PD supply isn't included, so it's a hidden extra cost

• Treble is neutral-bright rather than warm or forgiving, and can tip toward fatiguing with already-bright headphones or IEMs

• Not a source device at all: no DAC, no Bluetooth, so you need a separate DAC or line-out already in your chain

• Doesn't compete with pricier all-in-one options like the FiiO K7 on connectivity or convenience, since those built-in DAC/amp combos add a source the GIGAS 1 lacks

• Desk-bound by design, not a portable solution for anyone wanting a battery-powered amp on the go (that's what the GIGAS 2 is for)