Bowers & Wilkins Pi5 S2 Review: Detailed Sound in a Bulky Case

Introduction

The Bowers & Wilkins Pi5 S2 is a true wireless in-ear model for listeners who care more about how a recording sounds than about carrying the smallest case on the market. It sits in a premium bracket at around $300 at retail, and it backs that positioning with a full in-ear design, active noise cancellation, a transparency mode, and a charging case that accepts both USB-C and wireless charging.

Across extended everyday use, the Pi5 S2 makes its strongest case through audio performance rather than through a long feature list. Voices stay clean and intelligible, music keeps a wide and well-controlled frequency range, and the earbuds behave consistently whether they are paired with a phone, a laptop or a smartwatch. The compromises are mostly physical: the case is noticeably bulky, and the fit requires attention during running.

Who This Product Is For

This is a set for listeners who treat sound quality as the priority. The Pi5 S2 is at its best with music that rewards detail and with spoken content where clarity matters, which makes it a natural fit for podcasts, audiobooks and long listening sessions. The manufacturer describes the earbuds as waterproof, so sweat and rain exposure are covered in normal use, which suits commuters and cyclists who ride in mixed weather.

It is less obviously aimed at buyers who want the smallest possible case, or at runners who need a fit that stays locked in place without adjustment. Those users can still enjoy the sound, but they should plan on spending time with ear tip sizes and on accepting a case that lives in a bag rather than a pocket.

Design, Case, and Build Quality

The earbuds themselves are small, full in-ear designs with a rounded, stemless body. In the hand they feel weighty and solid, with materials that do not read as cheap, and they seat into the case magnetically so they pop into position without fuss. Because there is no stem, the charging contacts sit closer to the skin than on stemmed designs, though the contacts appear to be plated, which should limit any corrosion concern for heavier sweaters.

The case is where the design gives ground. It charges over USB-C, and it is confirmed to work on a wireless charging pad, starting to charge as soon as it is set down. It is also larger and thicker than many competing cases, thick enough that it is uncomfortable in a pocket and better suited to a bag or a jacket with room to spare.

Colour options are light gray, dark gray, green and lilac, so there is a finish for most tastes. Build quality overall is reassuring, and the magnetic seating makes daily handling straightforward.

Main Strengths: Sound and Everyday Performance

Sound quality is the headline. The frequency response is wide and even, and the earbuds handle a broad range of material without sounding strained. An initial impression of heavy bass turned out to be caused by an equaliser setting on the paired phone rather than by the earbuds themselves; once that was corrected, the presentation became remarkably balanced. The same quality holds across high and lower streaming bit rates and across phone, computer and watch connections.

Noise cancellation and the transparency or pass-through mode can both be toggled directly on the earbuds. Cancellation introduces a faint hiss, a little more noticeable than on some rivals, but it disappears entirely once music or a podcast is playing.

Battery endurance is a genuine strength in practice. The case did not run flat across roughly 80 hours of mixed listening and riding, and it needed charging only once in that period, which points to a generous reserve. Figures are not printed on the packaging, and no quick-charging detail is confirmed, so it is best to treat the case as something you charge occasionally rather than track closely.

Voice Content, Calls, and Podcasts

Spoken content is where the Pi5 S2 separates itself from many in-ear models. Podcasts and audiobooks come through with clear, natural voices, and the bass response does not muddy speech the way it does on some earbuds. Where an audiobook includes music or sound effects, the balance holds, so there is no need to raise the volume to keep narration intelligible. Call performance matches that impression: people on the other end reported crystal clear voice pickup even in conditions that are not ideal for a phone call.

Fit, Comfort, and Workouts

Comfort over long sessions is good, and the earbuds sit securely during cycling. Running is the weaker scenario. During runs the fit struggled to stay put, and movement produced a clicking or bouncing noise that was noticeable on each attempt. That behaviour is common to in-ear designs when the seal is not ideal, and only one set of ear tips was available during testing, so trying the other supplied sizes is likely to change the result.

Three ear tip sizes ship with the product, and there is no foam option. At this price, a wider selection and a foam tip would be reasonable to expect, since a better seal improves both comfort and stability. Buyers who run frequently should factor in a little experimentation before deciding the fit is wrong.

Things to Consider Before Buying

The case is the most obvious trade-off. It is thicker than a phone and awkward in a pocket, which matters if portability is high on your list. The stemless shape also means the earbuds are less easy to grab and adjust than stemmed designs, and the contacts rest against the skin during wear.

Handoff between devices is less seamless than on some competing platforms, so users who move constantly between a phone, a tablet and a computer should expect to reconnect manually more often. Noise cancellation carries a slight hiss in silence, although it is inaudible with content playing. Finally, the waterproof rating covers sweat and rain, but there is no guidance suggesting the earbuds should be used for swimming, and at this price that caution is sensible.

Buying Advice

For sound-first listeners, the Pi5 S2 justifies its position. The tuning is balanced and detailed, voice content is exceptionally clear, and the microphone holds up on calls, which covers the three things most people use earbuds for. The long case endurance and wireless charging add convenience that shows up over months rather than minutes.

The decision comes down to how you use them. If most of your listening happens at a desk, on a commute or on a bike, the bulky case is a minor annoyance and the audio quality is the reward. If you run regularly, plan on testing ear tip sizes and consider whether a more secure fit matters more than sound quality. And if pocketability is non-negotiable, this is not the set to choose.

Conclusion

The Bowers & Wilkins Pi5 S2 is a strong choice for anyone who wants detailed, balanced sound and genuinely clear voice reproduction from a true wireless in-ear model. It gets the fundamentals right: comfortable long-session wear, effective noise cancellation, reliable call quality and a case that holds its charge for a very long time.

Its weaknesses are practical rather than sonic. The case is bulky, the fit loosened during running in testing, and the ear tip selection is thinner than the price suggests. Buyers who accept those trade-offs in exchange for excellent audio will find a set worth keeping.