Bowers & Wilkins Pi8 & Pi6 Comparison Review.
Honestly, I think both Pi8 & Pi6 sound awesome with only a slight advantage to Pi8 with its carbon drivers and better chipset that allows aptX Lossless and in-app 5-band EQ. They're best wireless sound quality I've heard from an earbud, even if I prefer real circumaural headphones. I've heard a couple of surprisingly good sounding "cheaper" (but not bargain basement priced) wireless earbuds from China, I hope to have a review of a specific pair soon.
But the greatest consistent SQ advantage between B&W's premium-priced Pi8 and the TW earbuds I've been listening to that sell for just below half the price, is
midrange. IMHO, Pi6 midrange sounds about the same as Pi8 to my ear-holes. If all you wanted was great SQ and didn't care about EQ and aptX Lossless, Pi6 is perfectly adequate.
I think the high-bit BT codecs like LDAC and aptX HD/Adaptive allow for great detail in cheaper TW earbuds. I'm always surprised at sound quality from Bluetooth nowadays because I lived through the early Bluetooth A2DP-era through the late 2000s that claimed "stereo sound". But they all sounded the same to me, the same tinny tonality and often spotty connectivity.
Nowadays you can actually get decent lower bass, and detailed highs on budget buds, even if some of the cheaper ones verge on a robotic sound to my ears. But the cheaper Chinese TW earbuds are liable to have tons of features in EQing options, DSPs and EQ-presets that you won't get from B&W's Music app. I'm surprised Pi8 provides a 5-band EQ, B&W's top-end Px8 headphones only have a bass & treble control in the app. But the out-of-the-box sound of Pi8 really lets the midrange come through and is actually quite pleasing listening to vocals, alto-sax, acoustic guitar, they all have a naturalistic sound to my ears that the cheap TW earbuds can't match.
But as good as they sound, I'm still not giving up my separate DAC/Amp components and modest collection of mid-to-high-end headphones.
Here's my full review:
Bowers & Wilkins Pi8 & Pi6 Wireless IEM Review & Comparison