The Symphonium Helios SE ranks #370 out of 1253 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: Symphonium
Prices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#370 Symphonium Helios SE: $1,199 Discontinued eBay
Pros: A broadly balanced tuning with a preference score of 75 against the Harman target.
Cons: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones. Discontinued.
Is the Symphonium Helios SE right for you?
Buy it if
- you want the tuning most listeners prefer in blind tests out of the box (Harman score 75).
- your taste runs warm: it scores 84 for that sound.
- you are sensitive to bright or sharp treble (treble sits 3.9 dB below target).
- you want sub-bass rumble that reaches down to 20 Hz.
Skip it if
- you want to buy it new: it is discontinued.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 1.72 dB standard deviation |
| Driver Type | Balanced Armature |
| Drivers | 4 x balanced armature |
| Form Factor | In-ear |
| Harman Preference Score | 75 (median of 5 squig.link measurements, calibrated to AutoEQ) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.9 dB at 30 Hz) |
| Tonal Tilt | -0.52 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -5.7 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 91 out of 100, up from 75.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| High shelf | 10,000 Hz | -3.2 dB | 0.70 |
| Peak | 23 Hz | -1.4 dB | 1.89 |
| Peak | 124 Hz | +2.0 dB | 0.61 |
| Peak | 1,603 Hz | -1.2 dB | 1.75 |
| Peak | 3,140 Hz | +1.7 dB | 6.00 |
| Peak | 4,419 Hz | +5.6 dB | 0.95 |
Neutral target
Set a preamp of -5.6 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 93 out of 100, up from 39.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -8.4 dB | 0.70 |
| High shelf | 10,000 Hz | -3.2 dB | 0.70 |
| Peak | 23 Hz | -1.9 dB | 1.64 |
| Peak | 171 Hz | +1.9 dB | 0.76 |
| Peak | 1,603 Hz | -1.2 dB | 1.67 |
| Peak | 3,140 Hz | +1.7 dB | 6.00 |
| Peak | 4,419 Hz | +5.6 dB | 0.95 |
Studio flat target
Set a preamp of -6.1 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 88 out of 100, up from 21.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.7 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 30 Hz | -1.7 dB | 1.84 |
| Peak | 73 Hz | +1.0 dB | 2.09 |
| Peak | 1,457 Hz | -1.3 dB | 1.65 |
| Peak | 3,148 Hz | +6.0 dB | 1.21 |
| Peak | 5,568 Hz | +1.5 dB | 2.60 |
Warm target
Set a preamp of -3.9 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 91 out of 100, up from 84.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +0.4 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 162 Hz | +2.1 dB | 0.59 |
| Peak | 3,807 Hz | +3.9 dB | 1.28 |
Bass target
Set a preamp of -5.7 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 93 out of 100, up from 75.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.0 dB | 0.70 |
| High shelf | 10,000 Hz | -3.2 dB | 0.70 |
| Peak | 23 Hz | -1.4 dB | 1.88 |
| Peak | 124 Hz | +2.0 dB | 0.61 |
| Peak | 1,603 Hz | -1.2 dB | 1.74 |
| Peak | 3,140 Hz | +1.7 dB | 6.00 |
| Peak | 4,419 Hz | +5.6 dB | 0.95 |
Bright target
Set a preamp of -6.3 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 83 out of 100, up from 27.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -8.4 dB | 0.70 |
| Peak | 23 Hz | -1.9 dB | 1.63 |
| Peak | 168 Hz | +1.9 dB | 0.82 |
| Peak | 1,662 Hz | -1.8 dB | 1.48 |
| Peak | 3,573 Hz | +6.0 dB | 1.01 |
| Peak | 5,539 Hz | +3.4 dB | 4.24 |
V-shaped target
Set a preamp of -6.5 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 79 out of 100, up from 64.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.6 dB | 0.70 |
| High shelf | 10,000 Hz | +0.9 dB | 0.70 |
| Peak | 23 Hz | -1.3 dB | 2.21 |
| Peak | 163 Hz | +3.2 dB | 0.66 |
| Peak | 1,603 Hz | -2.0 dB | 1.20 |
| Peak | 3,354 Hz | +6.0 dB | 0.97 |
| Peak | 5,467 Hz | +3.6 dB | 3.80 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the Symphonium Helios SE measures across the audible range, against the Harman in-ear target that most listeners prefer in blind tests. Where the line sits above the target that range sounds louder (more bass, brighter treble), below it quieter. The curve is the median of 5 independent measurements, so one odd sample or rig cannot skew it, and both lines are shifted so their 500 Hz to 2 kHz average sits at 0 dB.
Measurement data: median of 5 measurements from the squig.link databases of freeryder05, mmagtech, nymz, precog and ragnarok. Thanks to each of them for publishing their work.