Drop THX AAA 789 vs Schiit Jotunheim 3 Review

Two of the most talked-about headphone amplifiers in the enthusiast community — the Drop THX AAA 789 and the Schiit Jotunheim 3 — represent two very different philosophies about what a great amp should be. One is a precision-engineered, measurements-first powerhouse that became a community darling for its transparent sound. The other is a full-featured, modular desktop amp from a brand with a cult-like following. If you're trying to figure out which belongs on your desk, this breakdown is for you.

Drop THX AAA 789

The Case For It

The 789 built its reputation on one thing: getting out of the way. The THX AAA (Achromatic Audio Amplifier) topology is engineered for vanishingly low distortion and noise, and the 789 delivers on that promise. Audiophiles who prioritize measurements and transparency consistently land on this amp when they want to hear their headphones — not the amplifier's character. It handles both balanced XLR and single-ended RCA inputs, outputs through a balanced 4-pin XLR and a 1/4" single-ended jack, and has enough power to drive demanding planars like the HiFiMAN Arya without breaking a sweat.

The community reception has been strong. One Reddit user noted upgrading from the 789 to the Jotunheim 3 as a deliberate step up — implying the 789 is a solid launchpad, not a stepping stone you're desperate to leave. For its price point, the 789 offers balanced amplification that used to cost twice as much just a few years ago. That's the real story here.

Where It Falls Short

The 789 is an amp — just an amp. No DAC module, no phono stage, no Bluetooth. You'll need a separate DAC, which adds to the total system cost. The industrial aesthetic is clean but polarizing: the chunky rectangular chassis with its single gain-switch and volume knob isn't going to win design awards. And if you want a warm, tube-adjacent sound with some coloration and musicality baked in, the 789's clinical transparency will feel sterile. It gives you the truth about your source and headphones, which is great when the chain is good and unforgiving when it isn't.

Schiit Jotunheim 3

The Case For It

Schiit's Jotunheim line has always been about versatility and Schiit's own brand of no-nonsense engineering. The Jotunheim 3 is a fully balanced desktop amp with a modular slot — you can drop in an optional DAC, phono preamp, or other modules, turning it into a more self-contained system. For users who want to clean up their desk and reduce the number of boxes, that matters.

Sound-wise, the Jotunheim 3 has a slight warmth and body to it compared to the razor-flat 789. For headphones like the Focal Elex or Sennheiser HD 6XX — both mentioned by at least one real-world user who paired them with a Jotunheim 3 setup — that touch of musicality can work in your favor. The Elex especially benefits from an amp that doesn't over-expose every transient. The Jotunheim 3 also includes a preamp output, which makes it genuinely useful if you're running powered speakers alongside your headphones.

Where It Falls Short

The Jotunheim 3 costs more than the 789 outright, and if you want the DAC module, that's an additional cost on top. Schiit's modular DAC options are solid but not best-in-class — most serious users end up pairing the Jotunheim with an external DAC anyway, which defeats part of the convenience pitch. Pure measurements-heads will also point out the 789 measures better on paper. Whether that translates into audible differences in real listening is genuinely debated, but if you're the type who sleeps better knowing your amp's THD+N is as low as possible, Schiit isn't going to scratch that itch the same way.

Head-to-Head Comparison

Feature	Drop THX AAA 789	Schiit Jotunheim 3
Topology	THX AAA (feed-forward)	Fully differential solid-state
Balanced Output	Yes (4-pin XLR)	Yes (4-pin XLR)
Modular DAC Slot	No	Yes
Preamp Output	No	Yes
Sound Character	Neutral, transparent	Slightly warm, musical
Measurements	Class-leading (low THD+N)	Good, but not benchmark
Best Pairing	Planars, analytical headphones	Dynamic drivers, Focal, Sennheiser
Build	Solid, functional	Premium, American-made
CPrice Rating	4/5	4/5

The Verdict: Different Tools, Different Goals

If you are chasing the most transparent, measurement-optimized amplification for the money and you already have a good DAC, the Drop THX AAA 789 is a remarkably hard amp to beat at its price. It's the right choice for planars, for people who care about objectivist audio principles, and for anyone who wants to remove the amp as a variable from their chain entirely.

If you want a more flexible desktop system — with a preamp out for powered speakers, an optional built-in DAC, and a sound signature that flatters dynamic driver headphones like the HD 6XX or Focal Elex — the Jotunheim 3 is worth the higher asking price. Real-world users who have owned both tend to describe the upgrade as meaningful but not dramatic, which tells you the 789 is no slouch.

One practical note: if you're pairing either of these with a Sennheiser HD 6XX, the Jotunheim 3's warmer character tends to be a better synergistic match. For HiFiMAN planars or Audeze cans where you want maximum resolution, the 789's neutrality lets the headphone speak for itself.

Frequently Asked Questions

Q: Is the Drop THX AAA 789 worth buying in 2025?

A: Yes, especially at its current street price. The THX AAA topology still delivers class-leading distortion figures, and for balanced, transparent amplification it remains one of the best value propositions in desktop audio.

Q: Does the Schiit Jotunheim 3 need an external DAC?

A: Not necessarily — Schiit offers optional DAC modules that drop into the Jotunheim 3's expansion slot. However, many serious users still opt for a dedicated external DAC like the Schiit Modius for better overall performance.

Q: Which amp is better for the Sennheiser HD 6XX?

A: The Jotunheim 3's slightly warmer character tends to pair well with the HD 6XX's already-intimate midrange presentation. The 789 will work fine but may sound leaner depending on your source.

Q: Can either of these drive power-hungry planars like HiFiMAN Arya?

A: Both can, but the 789 with its balanced output is particularly well-regarded for demanding planar loads. The Jotunheim 3's balanced stage also handles planars competently.

Q: Should I get the Jotunheim 3 with the built-in DAC module or buy a separate DAC?

A: If desk space and simplicity matter to you, the module is a reasonable convenience option. If you want the best possible sound quality and already own a capable DAC, skip the module and use what you have.