Overview

The FiiO JT7 is an open-back planar headphone built around a 95x86mm proprietary driver with a 3μm ultra-thin diaphragm and FiiO's F.E.S. (FiiO Elastic System) for added diaphragm elasticity. It's rated at 18 ohms with 92dB/mW sensitivity, low enough to run from a wider range of sources than most planar headphones. A fiberglass headband with four-axis rotation and breathable mesh earpads keep the fit comfortable, and the whole headphone folds down and weighs 318g. FiiO includes a 3.5mm cable and a 4.4mm balanced cable, along with a 6.3mm-to-3.5mm adapter.

Simcoe Audio Video Insight

An 18-ohm impedance is unusually low for a planar driver, which typically needs more power than a dynamic driver of the same sensitivity — it's part of why FiiO can market the JT7 as usable straight from a phone or laptop rather than requiring a dedicated amp.

• 95x86mm planar driver with a 3μm diaphragm and F.E.S. technology
• Open-back, foldable design at 318g
• 3.5mm and 4.4mm cables included, plus a 6.3mm adapter

Best for the FiiO JT7: use the 4.4mm balanced cable with a DAP or desktop source that supports it, since the low 18-ohm impedance means you'll still get a usable result from simpler sources if that's all you have.

More Details

Why It Wins

• 95x86mm Planar Driver: A 3μm ultra-thin diaphragm paired with FiiO's F.E.S. technology for added elasticity.
• 18-Ohm Impedance: Unusually easy to drive for a planar headphone.
• Foldable, Open-Back Design: A 318g build with a four-axis rotating, fiberglass headband.

What Makes It Different

Most open-back planar headphones need a dedicated amplifier to sound their best and don't fold for storage. The JT7's low 18-ohm impedance and foldable design make it more practical to move around with than a typical planar headphone, without giving up the driver technology.

Technical Highlights

• 92dB/mW Sensitivity: Reasonably efficient for a planar magnetic driver.
• Breathable Mesh Earpads: Replaceable, along with the headband cushion.
• Hi-Res Audio Certified: Meets the format's certification requirements for high-resolution playback.

Buyers Guide

Who This Is For

• The Planar Curious Listener: An easier-to-drive entry point into planar magnetic headphones.
• The Traveller: A foldable design that packs down more easily than most open-back headphones.
• The Desktop and Portable User: 3.5mm and 4.4mm cables cover both use cases out of the box.

Ideal Use Case

• Home Listening Rooms: Where an open, accurate soundstage is the priority.
• Desktop Setups: Paired with a balanced source using the included 4.4mm cable.
• Portable Listening: The low 18-ohm impedance keeps it usable from simpler sources.

What To Pair It With

• A Balanced DAC/Amp or DAP: To use the included 4.4mm cable.
• A Smartphone or Laptop: Using the 3.5mm cable, thanks to the JT7's low impedance.
• Lossless or Hi-Res Source Material: To make use of its Hi-Res Audio certification.

Alternative Options

The JT7 is an open-back planar headphone built to be more portable and easier to drive than most. If you want a larger, higher-power planar design instead, FiiO's FT-series planar headphones — the FT5 or the flagship FT7 — step up in driver size and price.