Planar detail vs Sennheiser smoothness: the real audiophile choice

Build quality and design

The HIFIMAN SUNDARA uses planar magnetic drivers with a large diaphragm and open-back metal grilles, giving it a sleek, modern hi-fi look. At 169.00, it feels impressively premium for the money, though HIFIMAN’s reputation has historically been mixed on long-term finish consistency. The Sennheiser HD 600 is the more mature, proven design: light, understated, and built around a modular, serviceable chassis that has become a studio and audiophile staple for decades. Winner: Sennheiser HD 600, because it combines lighter weight, better long-term parts support and a more time-tested construction.

Performance

This is the heart of the decision. The Sundara’s planar magnetic drivers excel at transient speed, bass control and low distortion, typically delivering a more immediate, highly resolved sound with excellent separation. In practice, that means percussion has sharper leading edges, complex passages stay organised, and bass lines sound taut rather than rounded. The HD 600’s dynamic drivers are less about raw speed and more about tonal realism: its midrange is famously natural, vocals sit beautifully in the mix, and treble is smooth rather than aggressively detailed. If you want the most technically impressive presentation, the Sundara wins; if you want the most naturally musical, fatigue-free tuning, the HD 600 wins. Overall winner: HIFIMAN SUNDARA for sheer performance per pound, but only narrowly if you value neutrality above all else.

Sound signature and musicality

The SUNDARA is the more analytical of the two. Its planar driver architecture tends to produce cleaner bass extension, a more open top end and a wider, airier stage, which can make jazz, acoustic recordings and well-mastered electronic music sound thrillingly transparent. The HD 600, by contrast, is the benchmark for midrange honesty: guitars, pianos and vocals have a believable body and texture that many listeners find more emotionally convincing over long sessions. The SUNDARA may reveal more detail, but the HD 600 often sounds more “right” on human voices and natural instruments. Winner: Sennheiser HD 600 for overall tonal balance and long-term listenability.

Comfort and fit

Both are open-back over-ear designs, but they wear differently. The HD 600 is notably light and clampy in a way that becomes reassuring rather than oppressive after a short break-in period; it disappears on the head for many users. The SUNDARA is also comfortable, with larger pads and a spacious feel, but it is usually the heavier-feeling headphone and can be a bit more demanding in fit. For marathon listening, the Sennheiser’s lighter, simpler ergonomics give it the edge. Winner: Sennheiser HD 600.

Amplification and source matching

Neither headphone is a casual phone plug-in if you want the best from it. The Sundara’s planar magnetic design typically benefits from a capable amplifier with good current delivery, and it tends to scale noticeably with better source gear. The HD 600 is also famously amp-sensitive, with a higher impedance load that rewards a proper headphone amp or a strong DAC/amp combo; it can sound polite and underdriven from weak outputs. In real-world terms, the Sundara is easier to justify as a “value upgrade” if you already own decent amplification, while the HD 600 is the more demanding classic that truly wakes up on quality gear. Winner: tie, because both need proper amplification, but each in different ways.

Price and value for money

This is where the Sundara makes its strongest case. At £169.00, it is £160.99 cheaper than the HD 600 at £329.99, yet it delivers planar magnetic performance that many listeners would expect from a far pricier headphone. The HD 600’s higher price reflects its legacy, consistency and tuning pedigree, but in pure pound-for-performance terms it is hard to ignore how much less the Sundara costs. If you are buying with value in mind, the Sundara is the clear winner. Winner: HIFIMAN SUNDARA.

Overall user experience

The Sundara feels like a modern audiophile bargain: open, fast, revealing and capable of sounding genuinely high-end when paired well. It is the more exciting listen and the one most likely to wow someone upgrading from mainstream headphones. The HD 600 is the safer, more universally trusted reference: less flashy, more emotionally natural, and often the better long-term companion for vocals, classical, folk and acoustic music. If you want a headphone that impresses on first listen, the Sundara wins; if you want one that remains trustworthy for years, the HD 600 wins. Overall winner: Sennheiser HD 600 for the complete ownership experience, but only if you are willing to pay the premium.

Overall summary: the HIFIMAN SUNDARA is the better buy for most people because it offers planar magnetic detail, speed and openness at a far lower price. The Sennheiser HD 600 is the more refined reference for natural mids, comfort and long-term reliability, but its £329.99 price makes it a harder value proposition unless you specifically want that classic Sennheiser tuning.