Symphonium Audio
Helios
Introduced 2021$1,099 MSRP
The Helios is a 4-driver balanced-armature universal in-ear monitor from Symphonium Audio, a small Singapore-based brand founded by former Head-Fi community members that has released only a handful of models (Mirage, Helios, Triton, Meteor) rather than a wide mass-market lineup (Headfonics). It earned a strong enthusiast reputation as what one reviewer called "the brightest kilobuck IEM" thanks to its proprietary FLAT output-impedance-matching technology, developed in collaboration with fellow boutique maker Subtonic Audio (Headphones.com).
MSRP
$1,099
Used market · Good
$538
-51% vs MSRP
as of Sep 1, 2026MSRP to used market
From $1,099 at launch to $538 today.
Specifications
- Cable
- 26 AWG pure OCC copper cable co-developed with Altalune Audio; spring-loaded 0.78mm 2-pin connector; offered in 2.5mm, 3.5mm, and 4.4mm termination options
- Price
- $1,099
- Impedance
- 8.5 ohms @ 1 kHz
- Sensitivity
- 104 dB/Vrms @ 1 kHz
- Shell material
- Machined AL6061-grade aluminum alloy shells, matte black finish
- Flat technology
- Proprietary impedance-matching design (developed with Subtonic Audio) that minimizes source output-impedance sensitivity
- Frequency response
- 12 Hz–24 kHz, ±2 dB
- Driver configuration
- Quad balanced-armature ("4BA") universal IEM with a custom-tuned true four-way crossover
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