iFi ZEN CAN Signature

On the Audio Precision bench the balanced output delivers 645 mW into 300 ohms — far past the 100 mW that class of load needs — and iFi rates the Signature at over 15 V into 600 ohms. Below about 32 ohms the picture inverts: distortion climbs, and the reviewer concluded the design is current starved, reporting audible distortion and momentary muting on a 25-ohm planar pushed past moderately loud.

⚠ vs. listeners — Reviewers who used low-impedance planars — HiFiMan HE400-series, Arya, Fostex — reported no trouble at all, while the bench says the amp struggles there. The discriminator is level: the failure appears only when the amp is driven hard, which is above where most people listen.

Signal-to-noise ratio measured very good at unity gain, and performance at a 50 mV output above average though behind the best amps tested — enough that the reviewer flagged very sensitive IEMs as able to generate audible noise above 84 dB.

Distortion sits at about −100 dB, which is what limits SINAD, and it did not change between the single-ended and balanced outputs. Frequency response measured flat and good, and crosstalk was called quite low for an amplifier, with strong capacitive coupling between channels.

⚠ vs. listeners — The warmth reviewers describe is not in the frequency response, which measures flat — so whatever they are hearing, it is not tone controls left on. That is exactly the point the measurement camp presses.

Three analogue inputs (RCA, 3.5 mm, 4.4 mm balanced), 6.35 mm and 4.4 mm headphone outputs, a 4.4 mm balanced line output that follows the volume knob, and four gain settings in 6 dB steps — 0, 6, 12 and 18 dB. Output impedance is specified at 0.25 ohms single-ended and 0.5 ohms balanced. There is no digital input and no single-ended preout.

The volume control is an analogue potentiometer whose maker recommends running it at 11 o'clock or higher for optimal channel matching; on the bench, channel matching drifted past a 0.5 dB threshold early in the travel. iFi's own headphone-matching calculator returns 121 dB — flagged "Too loud" — for the amp paired with the very headphone its EQ preset targets.

⚠ vs. listeners — The measurement says the bottom of the knob is unreliable and the calculator says the pairing is too hot, yet a reviewer who repeated the experiment with the same units needed to add 6–12 dB of gain to reach listening level. Which camp you land in depends on your source's output, your headphones' sensitivity and how loud you actually listen — not on the amp being faulty.

As of August 2026 iFi's own store lists the ZEN CAN Signature at £299 in all four versions and the newer ZEN CAN 3 at £229 — the cheaper, later model carrying a higher rated output, 2,000 mW against the Signature's 1,890 mW, and five EQ modes rather than one.