Campfire Audio makes the Iris in Portland, Oregon, where the company designs, engineers and assembles its earphones by hand. This two-driver hybrid for universal fit sits among the more affordable models in the catalogue at USD 349, and its body is one of the smaller shells Campfire produces.
Key specs that matter
Inside each earpiece a 10 mm dynamic driver with an ADLC diaphragm - amorphous diamond-like carbon - handles lows and mids, while one balanced armature driver looks after the upper frequencies. Campfire lists a frequency range of 5 Hz to 20 kHz, an impedance of 14.8 ohm at 1 kHz and a sensitivity of 94 dB SPL at 1 kHz for an input of 17.26 mVrms, with total harmonic distortion under 0.5 %. The Iris is covered by a two-year warranty from Campfire itself, and the price includes both cables and the full accessory set.
Engineering and use context
The shell is printed in 3D from transparent acrylic, so the drivers and internal tubing stay visible, and it is finished with a stainless steel nozzle and stainless accents around the connector. A pressure control vent lets trapped air escape from the rear chamber of the woofer, so the ear does not feel blocked over long listening periods. Cables attach through Campfire's own matrix MMCX connectors, a sturdier take on the familiar MMCX snap socket. Two Time Stream Metal cables come in the box, each built from four silver-plated copper conductors, one ending in a 3.5 mm single-ended plug and the other in a 4.4 mm balanced plug, so no adapter is needed when switching between source types. Three families of tips are included in small, medium and large sizes - foam, silicone and Campfire's High and Clear design. The package also holds a handmade leather wallet made in Portugal in a Sage colour, an IEM cleaning tool, a microfiber cloth and a CA lapel pin.
Pairing
Low impedance and moderate sensitivity mean a phone adapter or USB dongle DAC can drive the Iris to useful levels, although a portable player or desktop headphone amplifier with a quiet output gives more headroom. Balanced outputs on current portable players and dongles connect directly through the second cable. Since the MMCX socket is widely supported, owners can also fit third-party cables if they need a different plug or length.
Alternatives
The Campfire Audio Honeydew is a universal in-ear from the same Portland workshop that belongs to the budget tier of the catalogue, below the Iris in price.