HiFiMan Arya Organic vs Sennheiser HD 660S2

HiFiMan Arya Organic

The Arya Organic is the fourth variant of HiFiMan's Arya, and reviewers read it as the warmer, more forgiving voicing in the line rather than a straight technical upgrade. The midrange draws the most consistent praise: vocals sit forward and textured, described as exceptionally realistic with minimal sibilance, and instruments hold their own tonal character. Bass reaches deep and stays fast and controlled, with more weight and sub-bass impact than the earlier Arya versions, but it is tuned flat rather than boosted, and reviews warn that hip-hop and EDM listeners will want more. Two real splits remain. On soundstage, some reviewers report the headspace shrank against earlier Aryas in exchange for tighter, better defined placement, while another argues it recovers width the V3 had given up. On treble, some hear an audible upper-frequency emphasis that glistens or reads slightly bright, while another says it gained definition rather than level. The reviews that address harshness rule it out. Comfort is a repeated strength: large asymmetric oval cups, a suspension headband, and clamp that stays easy over long sessions at a rated 440g with cable. The bundle draws repeated criticism, a single 6.35mm cable in plain cardboard for a headphone that launched at $1,299. Discounting since launch has pushed the street price far below that figure, which is the main reason it still competes.

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.