Acoustic upgrades are more modest this time around – understandable, given that the last tune-up was only in 2018. New bypass capacitors have been introduced from the 700 Series Signature range, while the main high-frequency and mid-frequency capacitors have been upgraded with new, improved designs.

The bigger changes are cosmetic. A special anniversary logo is etched into the tweeter surround on every model, while two new finishes join the existing black and white to mark the occasion: an oak that will be available here in the UK, and a red cherry version that is cruelly limited to Asia.

Bowers & Wilkins 600 Series Red Cherry
Look at this lovely cherry finish that you won't be able to buy

“The 600 Series Anniversary Edition is a classic example of Bowers & Wilkins thinking” said Andy Kerr, the company’s director of product marketing & communications. “By using our unique, in-house-developed components and technology from higher ranges, we can raise the performance of our entry-level product to new heights and for a very modest premium."

The 600 Series refresh is a return to the fundamentals from the company, which has slowly been expanding its range into noise-cancelling headphones - three years on and the B&W PX are still a fixture in our noise-cancelling chart - and even wireless neckbuds like the PI3

The updated 600 Series models are the 607 and 606 bookshelf speakers, the 603 floorstanding speakers, and the HTM6 centre-channel. They go with the existing ASW608, ASW610 and ASW610XP subwoofers, though those haven’t been given the anniversary special treatment.

The range has had a slight price bump, and now starts from £449/$699 for a pair of 607s, though the truly committed can drop £2916/$4296 for the complete 600 Series Anniversary Edition Theatre setup, which includes a pair of 603s, a pair of 607s, the HTM6, and an ASW610 subwoofer.

The whole range will be available to buy from Bowers & Wilkins by the end of September.