Band: opinion spread · Dot: weighted average
Sources split on quantity, not quality. Everyone hears the bass as fast, textured and punchy. Most also hear it as full and well extended — 'among the best in headphones', with no shelf to get past. A smaller group finds the deepest octave a touch lean and adds an EQ shelf or a tube amp. Both are describing the same curve: it reaches lower than most open dynamics, but not as low as the Harman target or a good planar.
Measured
oratory1990's GRAS file sits 6.9 dB under the Harman over-ear target at 20 Hz and 3.9 dB under at 50 Hz, but about 4 dB above his HD 600 at 20 Hz; six squig rigs agree, putting it 3.8–5.6 dB above the same rig's HD 600 at 20 Hz. Against the original Utopia the sub-bass is within about ±1.5 dB on four rigs, so the 'more bass' some hear is the lower treble making the low end more prominent. SoundStage measured a 770 Ω impedance peak at 52 Hz, which gives about +3.5 dB around 65 Hz from a 75 Ω source — one reason tube amps make it sound fuller.
vs. listeners — The graphs agree on one curve: deeper than a typical open dynamic, shallower than Harman. 'Lean' and 'extended' are the same response judged against different references (a bass-boosted target or a planar vs other dynamics), and the amp's output impedance moves the 50–80 Hz region by several dB.
“The bass here is highly addictive and easily among the best in headphones.”
unheardlab (Sai)
“it doesn’t quite have the bombast below 60 hz that I hear in my LCD-X”
pt.audio (Dave McNair)
