The Pi8 earns its reputation on sound: detailed, spacious, and fuller in the low end than many listeners will expect, with a retransmitting case that solves a travel problem. Battery life trails the rated figure in SoundGuys' testing, noise cancelling is strong rather than class-leading, and the price sits above mainstream rivals. Check the current price on Amazon before deciding.
— THE VERDICT · JUDGEANY EDITORSBowers & Wilkins positions the Pi8 as its reference true wireless earbuds, and the published record mostly backs up that ambition on sound, while pushing back on battery life and value. This review pulls together Bowers & Wilkins' own specifications, published reviews from SoundGuys, Tom's Guide, TechRadar and Audio Advice, and owner ratings reported from retail listings. JudgeAny runs no test lab of its own, so every measurement and listening impression below belongs to one of those published sources, not to this site.
Sound: detailed, spacious, and bassier than expected
The Pi8 uses a 12 mm Carbon Cone driver in each earbud, adapted from Bowers & Wilkins' Px8 over-ear headphones, with a dedicated DSP, amplifier and DAC per side, per Bowers & Wilkins. SoundGuys, which tested the earbuds for two weeks on firmware 1.0.16.18, concluded that most people will enjoy the sound, while warning that the bass is stronger than some listeners will expect. Its HEAD acoustics MDAQS assessment gave the Pi8 an overall score of 4.9 out of 5, a very high result that points to broad listener appeal rather than a niche tuning. Tom's Guide, which listened across vocal, classical and everyday material, described the sound as detailed and immersive, with a snug fit that kept sound leakage in check even at higher volume. TechRadar, which ran the Pi8 for three weeks against rivals including the Sony WF-1000XM5 and Bose QuietComfort Ultra Earbuds, kept them as daily companions through office days, train journeys and a long weekend away, which suggests the tuning holds up beyond a first listen.
Noise cancelling and calls: strong, with a ceiling
Each earbud carries three microphones for telephony and ANC, per Bowers & Wilkins, and the system adapts to surroundings rather than offering adjustable ANC strength. SoundGuys measured an additional 30 dB of attenuation at low frequencies with ANC on, on top of the passive isolation from a snug fit, and called the noise cancelling excellent, particularly for engine rumble on flights. Its Pass-Through mode, for holding a conversation without removing the buds, replicated the feeling of not wearing earbuds fairly accurately. Tom's Guide found everyday irritants such as traffic, wind and office chatter almost completely blocked, though piercing sounds like a crying baby still bled through, and the person on the other end of test calls reported clear, loud voice pickup. SoundGuys was more reserved on calls, noting that background noise rejection is not exceptional and some environmental noise leaks through, even though voices stay intelligible. Sound Advice, in a separate review, put the same ceiling in plainer terms: the Pi8's hybrid ANC is worthwhile, but it is not as effective as Bose at low frequencies, and comparable cancelling can be had for quite a lot less money.
The case that doubles as a transmitter
The Pi8's most unusual feature lives in its charging case. Plug the included USB-C to USB-C or USB-C to 3.5 mm cable into a wired source, an airplane seatback screen, a gym machine or an older hi-fi, and the case retransmits the audio to the earbuds over aptX Adaptive, per Bowers & Wilkins and SoundGuys. For iPhone owners, that matters more than it first appears: the earbuds support aptX Lossless over a regular Bluetooth connection, but only with a compatible Android phone, while the case route is how Apple devices get aptX audio at all. SoundGuys found the transmitter sound still scores very high on its MDAQS assessment, with a slight drop in immersiveness and slightly less bass and less energy around 5 kHz than the direct Bluetooth connection, which shifts focus toward vocals and piano. Multipoint pairing is also on board, and SoundGuys reported no connection stutters while switching between an iPhone and a MacBook. The practical limit is that retransmission draws on the case battery, so a long flight of seatback listening eats into the reserve meant for recharging the buds.
Battery: the rated figure depends on who is measuring
Bowers & Wilkins rates the Pi8 at up to 6.5 hours per charge with ANC on, plus 13.5 hours from the case, for 20 hours in total, with a 2-hour full charge and a 15-minute charge worth around 2 hours of playback. SoundGuys measured 5 hours and 10 minutes on a single charge with ANC enabled, clearly short of the rated figure. Tom's Guide landed much closer to the spec sheet, reporting around six and a half hours with ANC on. Audio Advice split the difference in its own way, reporting closer to 7 hours in general listening and around 5 hours when calls, ANC and varying volume were mixed in. The honest reading is that 6.5 hours is achievable at moderate volume, but heavy use, calls and high volume pull it down, and the 20-hour total is middling next to rivals that stretch further. Wireless charging over Qi is included, which the cheaper Pi6 lacks, per Tom's Guide, and that softens the blow for anyone who already charges on a pad.
Fit, controls and the app: comfortable, but fiddly in places
At 7 g per earbud, the Pi8 is heavier than most rivals, yet SoundGuys reported no comfort issues, crediting a shape Bowers & Wilkins developed from an extensive ear-shape study, with four ear tip sizes in the box. TechRadar's reviewer wore them through an aerial silks training session without them budging, and Tom's Guide found the fit snug and secure. The case is a different story: at 46 g and 65 x 29 x 52 mm it is pocketable, but SoundGuys found it scratches easily in a pocket with keys and acts as a fingerprint magnet, a poor look for a flagship-priced product. The earbuds are rated IP54 for dust and splashes, while the case carries no water resistance rating. Controls are tap-based and responsive, per SoundGuys, but the single tap cannot be disabled, so adjusting the fit can pause the music, and only the tap-and-hold gesture can be reassigned. The Bowers & Wilkins Music app offers a 5-band EQ and a TrueSound mode, but SoundGuys noted the EQ bands are not labelled with their frequencies and there are no presets, which leaves beginners guessing and experts wanting more precision.
The conflicting evidence, and why the verdict still holds
The published record pulls in different directions on three points, and each one is worth naming. On battery, SoundGuys measured 5 hours and 10 minutes against the rated 6.5 hours, while Tom's Guide matched the rating and Audio Advice reported both 7 hours and 5 hours depending on use, which suggests the rating is a moderate-volume figure rather than a guarantee. On noise cancelling, SoundGuys called it excellent and measured strong low-frequency attenuation, while Sound Advice judged it a step behind Bose and not worth the premium on ANC alone. On bass, SoundGuys warned of more low end than expected over the direct connection, while its transmitter-case measurement showed slightly less bass emphasis, a difference that likely comes down to connection mode, fit, tips and volume as much as tuning. A smaller wrinkle: some retail listings describe the DSP in different bit-depth terms, and one Amazon listing bullet even claims longer earbud life than the official spec, so this review follows Bowers & Wilkins' own specification page for the numbers that matter. None of these conflicts overturns the core claim. Every outlet that criticized battery, ANC or price still praised the sound, and the case transmitter remains a genuinely useful feature that most rivals lack. The verdict survives because it rests on sound quality and the transmitter case, not on class-leading battery or the deepest noise cancelling.
Who should buy it
Buy the Pi8 if sound quality is the deciding factor and you travel with wired sources, since the retransmitting case turns seatback screens and gym machines into private listening stations, and the aptX Lossless support rewards a compatible Android phone. It suits listeners who want a flagship-tuned earbud for music first, with solid ANC and clear calls as supporting acts. Skip it if you need all-day battery without a charger nearby, the deepest noise cancelling available, a fully customizable app, or a case that shrugs off keys and pockets. Owner data is mixed in a way that fits the review consensus: a Best Buy listing summary reported 4.4 stars from 199 reviews, praising sound, battery, comfort and bass while flagging connectivity, price and touch controls, and an Amazon US listing snapshot showed 3.9 stars from 383 ratings. Check the current price on Amazon before deciding.