Choosing a Headphone Amplifier
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Most people don't need a headphone amplifier. Some people need one and don't know it. A few are running reference headphones on a laptop output and wondering why they're not getting the performance they paid for.
Here's how to figure out which situation you're in.
Do you actually need one?
If your headphones have impedance of 80Ω or higher, or sensitivity below 100 dB/mW, you'll get meaningfully better performance from a dedicated amp than from a phone or laptop headphone jack.
Practical examples:
- Sony MDR7506 (63Ω) — Runs fine from a phone. No amp needed.
- ATH-M50x (38Ω) — Runs fine from a phone. No amp needed.
- Beyerdynamic DT 770 Pro (80Ω) — Borderline. A dedicated amp makes a real difference.
- Sennheiser HD 650 (300Ω) — Needs a dedicated amp. Not optional if you want full performance.
- Sennheiser HD 600 (300Ω) — Same as the HD 650.
- Sennheiser HD 800 S (300Ω) — Definitely needs a dedicated amp.
For the full explanation, read What Headphone Impedance Means and When to Care.
Under $200 — the honest starting amp
Schiit Magni Unity — Clean, powerful, and built to last. Drives nearly any headphone. Low noise floor. Doesn't add character the recording didn't have. The Magni Unity includes a built-in phono stage, which makes it useful as a system hub — turntable into the phono input, headphones out. Simple and honest. Wall of Sound Standard pick.
Schiit makes it in California, stands behind it, and doesn't overcomplicate it. For a first dedicated amp, this is the right call.
The reference tier
Grace Design M900 — Mastering-grade conversion and headphone amplification in one unit. Drives anything. Colors nothing. Built to the standard of the professional studio equipment Grace has been making for decades. For a listener who wants reference performance without two separate boxes. Wall of Sound Reference.
What about the middle tier?
There's currently a gap in the catalog between the Magni Unity and the Grace M900. The honest move: buy the Magni Unity now, run it for a year, and let your actual listening tell you whether you've outgrown it. Most people don't.
Combining DAC and amp
If you're connecting from a computer or digital source, you'll also need a DAC before the headphone amp. Some units combine both — the Grace M900 does, as does the FiiO K7BT at a mid-range price. See Choosing a DAC for the full picture.