Campfire Audio IO Review: Ranked #856 of 909

Last updated: October 13, 2026

The Campfire Audio IO ranks #856 out of 909 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.

Brand: Campfire Audio

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Campfire Audio IO - ranked #856 of 909 In-Ear Headphones · Editor's rating 1.2/5

#856 Campfire Audio IO Discontinued eBay

Pros: Its tonal tilt of -0.62 sits close to the target, so the overall balance is neither dark nor bright. It uses 2 x balanced armature with an easy 26 ohm load.

Cons: Discontinued, so it is mainly found used. Its 4.99 dB spread from the target means a noticeably uneven response. A Harman score of 39 places it in the lower part of the in-ear rankings.

Released2019 (7 years ago)
ConnectionWired
Deviation From Target4.99 dB standard deviation
Driver TypeBalanced armature
Drivers2 x balanced armature
Form FactorIn-ear
Frequency Response5Hz - 22kHz
Harman Preference Score39 (measured by crinacle, via AutoEQ)
Impedance26 ohms
Sensitivity109 dB/mW
Tonal Tilt-0.62 (negative is warmer, positive brighter)
EQ preset to match the Harman target

Set a preamp of -6.9 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.

FilterFrequencyGainQ
Low shelf105 Hz+3.0 dB0.70
Peak186 Hz-5.1 dB0.53
Peak2,476 Hz+8.4 dB1.18
Peak1,612 Hz-10.9 dB2.44
Peak5,323 Hz+5.4 dB2.57
High shelf10,000 Hz-1.7 dB0.70
Peak9,469 Hz-1.7 dB1.82
Peak879 Hz+1.3 dB2.15
Peak1,265 Hz-1.1 dB3.80
Peak6,169 Hz+1.8 dB6.00

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