Overview

FiiO's FA19 is a flagship in-ear monitor built entirely around balanced armature technology — ten drivers per ear, developed in partnership with Knowles, with no dynamic driver in the mix at all. Each side splits the work across three dedicated clusters: four custom Knowles bass drivers, two Knowles ED mid drivers, and four Knowles SWFK treble drivers, covering a wide 20Hz-40kHz range at 106dB/mW sensitivity. The shells are DLP 3D-printed from photosensitive resin to a precision of up to 0.0375mm, keeping each earpiece to about 7g despite the ten-driver count. An 8-strand, 224-wire high-purity silver cable with swappable 3.5mm/4.4mm plugs rounds out a build aimed at listeners who want a fully resolved, all-BA sound signature.

Simcoe Audio Video Insight

Because every driver in the FA19 is a balanced armature, the sound leans toward speed and separation rather than the bigger, looser bass a dynamic driver would add — that's a deliberate design choice, not a shortcoming, and it's worth knowing going in if you're coming from a hybrid IEM. The three-cluster layout also means each frequency band is tuned somewhat independently, so small differences in ear tip seal can shift the balance between them more noticeably than on a single or dual-driver IEM. Take the time to work through the included tip options — foam, bass, balanced, dual-flange, vocal, SpinFit, and HS18 — until you find the seal that keeps all three driver clusters in step.

Best for the FiiO FA19: Start with the balanced or SpinFit tips for the most even seal across the three driver clusters, and use the 4.4mm balanced plug if your source supports it — the extra current the all-BA array can draw benefits from a balanced output.

More Details

Why It Wins

• 10-driver balanced armature array: four Knowles bass, two Knowles mid, and four Knowles treble drivers per ear, custom-developed with Knowles, giving each frequency band its own dedicated hardware rather than sharing a driver across ranges.
• Independently tuned frequency bands: because bass, mids, and treble each have their own cluster, FiiO can tune each band without one range compromising another.
• Precision 3D-printed shells: DLP resin printing to 0.0375mm precision keeps the ten-driver shell to about 7g per earpiece, so the added hardware doesn't add discomfort.

What Makes It Different

Most multi-driver IEMs in this category are hybrids, pairing a dynamic driver for bass with a smaller set of balanced armatures for mids and treble. The FA19 skips the dynamic driver entirely and uses ten balanced armatures instead, split into three purpose-built clusters — a different engineering approach than the hybrid designs more common at this price, aimed at listeners who prioritize detail and speed over dynamic-driver bass impact.

Technical Highlights

• Expanded MMCX connector: the detachable cable uses an expanded MMCX connector, making it straightforward to swap in a different cable later without being locked into FiiO's stock option.
• 8-strand silver cable: the stock cable is built from 8 strands of 224 high-purity silver wires with swappable 3.5mm/4.4mm plugs, so you can switch termination without buying a second cable.
• Hi-Res Audio certified: certified by both JAS and CEA, confirming the FA19 meets recognized high-resolution playback standards.

Buyers Guide

Who This Is For

• The All-BA Purist: Someone who has already tried hybrid IEMs and wants to hear what a fully balanced-armature design sounds like instead — fast, detailed, without a dynamic driver's bass character.
• The Detail-First Listener: A listener who cares more about hearing separation between instruments and vocal clarity than about maximum bass weight.
• The Cable-Tinkerer: Someone who wants an IEM with a detachable, expanded MMCX cable connector so they can experiment with third-party cables down the line.

Ideal Use Case

• Critical Listening at a Desk: Paired with a dedicated source at a desk or listening station, where the FA19's resolution and separation are easiest to appreciate.
• Studio Monitoring Reference: Useful as a reference IEM for checking mixes, where an accurate, detail-forward tuning matters more than bass emphasis.
• Balanced-Output Portable Rigs: Works well from a portable DAP or dongle DAC with a 4.4mm balanced output, taking advantage of the swappable plug system.

What To Pair It With

• A balanced-output DAP or dongle DAC: The FA19 includes a 4.4mm balanced plug, and an all-BA design benefits from the extra headroom a balanced source provides.
• FiiO's own K-series desktop DACs: For a home listening setup, a desktop DAC/amp gives the ten-driver array a clean, well-powered signal to work from.
• A high-resolution streaming source: Since the FA19 is Hi-Res Audio certified, pairing it with lossless or high-res streaming gets the most out of its 20Hz-40kHz range.

Alternative Options

If the all-balanced-armature approach isn't quite what you're after, FiiO's FH19 pairs a push-pull dual dynamic driver with six balanced armatures for a hybrid sound with more low-end weight, and the FX17 goes further still with a 13-driver tribrid design that adds electrostatic drivers for extended treble. For a simpler, single-driver alternative, the FD15's 13.8mm dynamic driver with swappable nozzles is worth a listen if you'd rather have one large driver than a multi-BA array.