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Sennheiser HD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black

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Macrodynamic punch is fairly good, even though these aren’t the last word for overall slam and punch. The S2 has a deeper, richer, more textured bass compared to the 600. The treble is more forward with S2. Smooth forward rather than sparkly. The female vocals of S2 are a little richer and more forward. Everything seems more forward with the S2. But, upon a longer listen it is not that the S2 is more forward. There is a sheen of glass taken away compared to the 600. There is for sure an increase in clarity and dynamics. This adds a richness to the sound. The earpads are the same ones that come with the other HD 6xx series of headphones, which means that the sound signature will become more mid-centric as the pads wear over time. The foam padding has been improved, aiding in comfort. The 109 PRO has a real sub-bass extension that doesn't roll-off at all so it sounds deeper and fuller especially with electronic bass tunes and modern music Microdynamics (gradual shifts in volume) are excellent, on the other hand. Separation is also above average, but some mid-range planars (e.g., the Hifiman Ananda Nano) are better. The HD660S2 benefit from a dedicated amp that can drive high-impedance loads. Comparisons Vs Sennheiser HD 650

Sennheiser HD 660S2 review: Wired for sound | Expert Reviews Sennheiser HD 660S2 review: Wired for sound | Expert Reviews

It goes deep without being boosted but the frequency response in not truly linear, there is still an audible mild roll-off, nonetheless it can now clearly reproduce low pitched instruments, like the double bass or the pipe organ while it can sound very satisfying and extended with electronic bass but don't expect bass-head levels of boosting. The initial clamping force was medium, it suited my head shape well and never felt too strong but your experience may vary.The big similarity is in the bass. The S2 does have a milder subbass bump of the 600 but has the mid bass jump of the 650. Someone took their time to get this S2 right. They lifted some of the “boringness” of the 600 but kept the tonality and clarity and detail of the 600. They also added to the S2 the midbass bump. Great touch. The center mid-range of the 109 PRO is more conservatively tuned, slightly reserved compared to the emphasized 660S2 so it offers a better tonal balance and it doesn't sound as pronounced and at-your-face, voices are less prominent and better blended. This is a treble of the highest quality and fidelity, the S2 sounds airy, crisp, crystal clear and ultimately transparent. Despite the usual sneer directed at plastic for not having a “premium” enough feel in hand, the HD 6xx series of headphones tend to last for a long time. My HD 650, for example, have been going strong for over seven years. The familiar design of the 6XX series re-appears on the HD 660S2.

Sennheiser HD 660S2 Wired Audiophile Stereo Headphones with

This new design utilizes stainless steel mesh, resulting in much tighter tolerance and superior material longevity. The driver housing and damping scheme is similar to the older models, with the major improvement being the magnet system. Sennheiser goes a slightly different route this time, with the upper-mids being less pronounced than the predecessors. Today I have HE-R9 + FiiO K7 I'm thinking of adding the HD660s2 to them because of the characteristic you said it has to project the sound in front of the person.On a technical level, the mid range of the HD660S2 is very transparent, crystal clear and finely articulated with plenty of harmonic variety, natural overtones and a full bodied texture.

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