Stored Category Comparison

FiiO EH13 vs Sennheiser HD 660S2

This page compares two published headphones profiles using stored summaries, source-attributed scoring, and a single lines-only radar for fast visual difference checks.

Back to FiiO EH13Open Sennheiser HD 660S2

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FiiO EH13
Sennheiser HD 660S2

Category Scores

Stored score comparison

Every score is pulled from the stored product intelligence snapshot for this category pair.

AxisEH13HD 660S2Delta
Bass
7.5
7.5
Even
Mids
7.2
7
-0.2
Treble
7
7
Even
Technicalities
6.5
7.4
+0.9
Soundstage
6.8
7
+0.2
Value
8.4
6.3
-2.1

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FiiO EH13 can only be compared against published headphones profiles.

Quick Read

FiiO EH13

Approved-source coverage for the EH13 is still early and thin, but the available material is clear enough on one point: it appears to be a wireless over-ear headphone, not a DAC/amp. Headphonesty’s CanJam NYC 2026 roundup treats it as an inexpensive, feature-rich entry model with LDAC, ANC, app-based parametric EQ, a sapphire-coated 40mm driver, and unusually long battery life for the price. Based on what is currently available, the EH13 looks strongest as a flexible, low-cost lifestyle headphone with more tuning control than most entry-level wireless sets, not as an enthusiast reference device. This dossier should be treated as early coverage pending deeper approved reviews.

Sennheiser HD 660S2

The HD 660S2 is a driver-level revision of the HD 660S rather than a new headphone. The voice coil was reworked and impedance moves to 300 ohms, matching the HD 600 and HD 650. The low end is the headline change: sub-bass extends further and the mid-bass carries more body than the predecessor, with the missing fundamental in lower-register instruments described as finally present. The tuning still stays measured rather than bass-forward, and it is explicitly not aimed at bass-heads. Tonally it sits between the HD 600 and HD 650 with a lean toward the HD 650, cleaner through the mids than the HD 650 and less forward than the HD 600. Treble is where reviewers split: one account hears considerably more bite, sizzle and crispness than the original without harshness, while another frames the profile as relaxed and deliberately not treble-emphasized. Staging is reported as taller and deeper with more precision than the predecessor, though the presentation is still called intimate rather than expansive. A dip through roughly 3-5 kHz is flagged for dimming detail on some tracks, with a few dB of parametric EQ offered as the remedy. The chassis, velour pads and headband carry over unchanged, and the packaging is judged a downgrade. Value is the real fault line: at a street price near $500 one verdict reads it as a clear technical step up on the HD 660S, while another concludes it does not differentiate itself from cheaper models in the same family and tells existing HD 660S and HD 600 owners to save their money.

FiiO • Headphones

FiiO EH13

Open page

Approved-source coverage for the EH13 is still early and thin, but the available material is clear enough on one point: it appears to be a wireless over-ear headphone, not a DAC/amp. Headphonesty’s CanJam NYC 2026 roundup treats it as an inexpensive, feature-rich entry model with LDAC, ANC, app-based parametric EQ, a sapphire-coated 40mm driver, and unusually long battery life for the price. Based on what is currently available, the EH13 looks strongest as a flexible, low-cost lifestyle headphone with more tuning control than most entry-level wireless sets, not as an enthusiast reference device. This dossier should be treated as early coverage pending deeper approved reviews.

Strengths

  • Very feature-rich for a low entry price
  • Full parametric EQ and LDAC support are standout advantages in the segment
  • Good battery-life story and practical everyday use case

Weaknesses

  • Approved-source review depth is still limited
  • Not positioned as a serious enthusiast reference headphone
  • Performance ceiling is likely defined by convenience rather than outright fidelity

Sennheiser • Headphones

Sennheiser HD 660S2

Open page

The HD 660S2 is a driver-level revision of the HD 660S rather than a new headphone. The voice coil was reworked and impedance moves to 300 ohms, matching the HD 600 and HD 650. The low end is the headline change: sub-bass extends further and the mid-bass carries more body than the predecessor, with the missing fundamental in lower-register instruments described as finally present. The tuning still stays measured rather than bass-forward, and it is explicitly not aimed at bass-heads. Tonally it sits between the HD 600 and HD 650 with a lean toward the HD 650, cleaner through the mids than the HD 650 and less forward than the HD 600. Treble is where reviewers split: one account hears considerably more bite, sizzle and crispness than the original without harshness, while another frames the profile as relaxed and deliberately not treble-emphasized. Staging is reported as taller and deeper with more precision than the predecessor, though the presentation is still called intimate rather than expansive. A dip through roughly 3-5 kHz is flagged for dimming detail on some tracks, with a few dB of parametric EQ offered as the remedy. The chassis, velour pads and headband carry over unchanged, and the packaging is judged a downgrade. Value is the real fault line: at a street price near $500 one verdict reads it as a clear technical step up on the HD 660S, while another concludes it does not differentiate itself from cheaper models in the same family and tells existing HD 660S and HD 600 owners to save their money.

Strengths

  • Sub-bass extension and mid-bass body are a clear step up on the HD 660S, with lower-register fundamentals finally landing with weight.
  • Tonality sits between the HD 600 and HD 650 with a lean toward the HD 650, reading smooth and even without a heavy treble roll-off.
  • Staging gains height and depth over the predecessor with more precise placement, and is called the standout improvement of the generation.
  • The 300 ohm load matches the HD 600 and HD 650 and rewards OTL or SETA tube amplification, where the most expansive pairings were found.
  • Detachable two-pin cables with 6.3mm and 4.4mm terminations make it easy to re-cable and repair over a long ownership period.
  • Weight is low at a rated 260 g with virtually no vertical pressure, so long sessions stay viable once the new-pad clamping settles.

Weaknesses

  • A dip through roughly 3-5 kHz dims detail on some tracks, and the fix offered is a few dB of parametric EQ rather than the stock tuning.
  • A subtle harmonic dissonance around 5-6 kHz sits over the upper mids and vocals, and EQ lifting the 2-4 kHz region can exaggerate it.
  • Lateral clamping pressure is high when brand new, and the velour pads need time in use before they soften.
  • The design was not changed for the S2, so the price increase over the HD 660S buys no hardware revision to the chassis, headband or pads.
  • Packaging was cut back from the previous generation to a smaller, simpler box that reads as more disposable.
  • Fully open, so isolation is effectively nil and outside noise comes straight through.