Overview

This listing is for a FiiO FH3 hybrid in-ear monitor in open box condition — inspected and confirmed fully functional, and built around the same 10mm beryllium-plated dynamic driver and two Knowles balanced armature drivers (ED30262 for mids, RAD33518 for highs) as a new unit. The dynamic driver handles bass while the two balanced armatures split mid and high frequencies, giving more detail and separation than a single-driver earphone typically offers at this level. The aerospace-grade aluminum-magnesium alloy shell is 5-axis CNC-machined to keep resonance down, and it ships with the same detachable MMCX cable and full set of eartips as a new FH3. Because this is an open box unit, expect the packaging to have been opened and the contents inspected rather than factory-sealed.

Simcoe Audio Video Insight

An open box FH3 gives you the identical driver configuration, shell, and cable as a brand new unit — the only difference is that the packaging has been opened and the earphone inspected before resale rather than staying sealed. If you're comfortable with that, it's a straightforward way to get FiiO's three-driver hybrid tuning in a unit that's already been checked over. Since it's already been inspected and confirmed functional, there's no additional setup or troubleshooting needed beyond what you'd do with a new pair — pick your eartip size from the 11 included pairs and you're set.

Best for the FiiO FH3 Open Box: Work through the 11 included eartip pairs to find your seal, since the hybrid driver setup depends on a good fit to balance the dynamic driver's bass against the two balanced armatures' mids and highs.

More Details

Why It Wins

• Hybrid driver configuration: a 10mm beryllium-plated dynamic driver plus two Knowles balanced armature drivers (ED30262 and RAD33518), splitting bass, mids, and highs across dedicated hardware.
• S.TURBO acoustic tuning: aimed at deeper, better-controlled bass from the dynamic driver.
• Aerospace-grade aluminum-magnesium alloy shell: 5-axis CNC-machined for a durable, resonance-controlled housing that holds up to daily use.

What Makes It Different

Many earphones at this level use a single dynamic driver and leave mids and highs to that same driver. The FH3's hybrid layout hands mid and high frequencies to two dedicated Knowles balanced armatures while the dynamic driver focuses on bass, a design more often found on pricier IEMs, and this open box unit gives you that same configuration in an inspected, ready-to-use pair.

Technical Highlights

• 10Hz-40kHz frequency response at 24Ω: a wide response range at an impedance most phones and portable sources can drive without extra amplification.
• High-purity monocrystalline silver-plated copper cable: a detachable MMCX cable at approximately 120cm, terminating in a 3.5mm plug.
• 100mW max input power: enough headroom for typical portable listening without needing a high-power desktop amp.

Buyers Guide

Who This Is For

• The Value-Focused Hybrid Fan: Someone who wants FiiO's three-driver hybrid sound and metal shell and doesn't need sealed retail packaging to feel confident in the purchase.
• The Practical First-Timer: A listener stepping up from single-driver earbuds who wants to try a hybrid driver setup in a unit that's already been checked over.
• The Inspected-and-Ready Buyer: Someone comfortable buying an open box item specifically because it's been checked and confirmed functional before resale, rather than an unopened but unverified box.

Ideal Use Case

• Everyday Commuting and Listening: The 24Ω impedance and detachable cable make the FH3 easy to use and maintain for daily wear.
• Stepping Up From Single-Driver Earbuds: A reasonable next step for someone moving from basic in-ear headphones into a multi-driver hybrid design.
• Backup or Secondary IEM: Works well as a second earphone to keep on hand, given it's a full hybrid design in open box condition.

What To Pair It With

• A phone or laptop headphone jack: The FH3's 24Ω impedance and 3.5mm plug make it easy to use directly from most sources without an amp.
• A basic USB-C dongle DAC: For a phone without a headphone jack, a simple dongle DAC keeps the setup portable.
• The included eartip variety: With 11 pairs across four sizes and types in the box, trying several before settling on one makes a real difference in how the hybrid drivers balance.

Alternative Options

For a step up in driver count and tuning flexibility, FiiO's FH19 pairs dual dynamic drivers with six balanced armatures and swappable filters. If a single dynamic driver with swappable nozzles appeals more than a hybrid design, the FD15 is worth comparing. And for listeners who specifically want the same hybrid design in factory-sealed condition rather than open box, a new FH3 from Simcoe's regular FiiO lineup is the straightforward alternative.