Short answer: the Hercules Audio Noah. It ranks #441 of 1291 in-ear headphones by sound quality, rated 4.0/5, at $1,400; the Symphonium Crimson ranks #522, rated 3.9/5, and costs $1,499, so there is little reason to consider the other one.
What the Hercules Audio Noah does well: A broadly balanced tuning with a preference score of 74 against the Harman target. Watch for: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
The case for the Symphonium Crimson: The median of 18 hobbyist measurements gives it a solid Harman preference score of 72 with a 1.85 dB spread, and its mids sit within about 1.4 dB of target, so vocals and instruments sound natural. Watch for: Presence sits about 4.5 dB low with a 7.3 dB dip near 4.3 kHz, so vocals and instruments lose some bite.
Buy the Hercules Audio Noah. It is rated higher for sound quality than the Symphonium Crimson and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Headphones rankings.
A broadly balanced tuning with a preference score of 74 against the Harman target.
Zeppelin & Co $1,400 eBay
The median of 18 hobbyist measurements gives it a solid Harman preference score of 72 with a 1.85 dB spread, and its mids sit within about 1.4 dB of target, so vocals and instruments sound natural.
Headphones.com $1,499.00 eBayPrices 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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Specifications Side By Side
| Hercules Audio Noah | Symphonium Crimson | |
|---|---|---|
| Price | $1,400 | $1,499.00 |
| Ranked | #441 of 1291 in In-Ear Headphones | #522 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 74 (median of 9 squig.link measurements, calibrated to AutoEQ) | 72 (median of 18 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.74 dB standard deviation | 1.85 dB standard deviation |
| Tonal Tilt | -0.69 (negative is warmer, positive brighter) | -0.87 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.8 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Tribrid (1 dynamic + 4 balanced armature + 2 electrostatic) | Balanced armature |
| Drivers | 1 x dynamic + 4 x balanced armature + 2 x electrostatic | 4 x balanced armature |
| Impedance | - | 6.05 ohms |
| Sensitivity | - | 106 dB/Vrms |
| Frequency Response | - | 10Hz - 24kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the Hercules Audio Noah from aden, audioamigo, boizoff, dl, eliseaudio, iemocean, jaytiss, kazi, koi, pw and superreview; the Symphonium Crimson from aden, aftersound, bloomaudio, eliseaudio, freeryder05, hadoe, jaytiss, kazi, listener, nymz, precog, ragnarok, sl0the, smirk, soundignity, theaudiostore, therollo9 and zerostresslevel, all via squig.link.
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