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Symphonium Audio Helios In-Ear Headphones - Open Box - 2.5mm — frequency response Measured: V-shaped

This is the actual measured response of the Symphonium Audio Helios In-Ear Headphones - Open Box - 2.5mm by symphonium (source: AutoEq · Hi End Portable). Compare it against the Harman target, listen to the tuning on test signals below, then check prices.

Signature: V-shaped Bass vs mids: +5.5 dB Treble vs mids: +6.8 dB Tuning vs Harman: 1.2 dB avg dev (close to target) Measured by: AutoEq · Hi End Portable On file since 2026-09-29

Wearing your own earphones or headphones? Pick them here and the player pre-corrects for their sound, so the demo plays the target tuning itself - not both mixed together.

Same signal, two ways: hear it without this tuning, then with it -

⚖ Compare this curve EQ preset download Full product page

Sounds like

Curve-shape similarity from the same measurements - open any two in the compare tool to overlay and hear them side by side.

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