NOW ADD THESE

ASTELL&KERN SR25 MKII

Long known for building some of the best portable audio players around, Astell&kern has taken things to the next level with the SR25 MKII. It’s an especially good fit for the IE 900 buds thanks to its 4.4mm balanced output socket. £699 / astellkern.co.uk

TIDAL

The A&K player allows you to install the Tidal app, and (as long as you’re paying for the highest tier) that allows you to send Mqa-powered Tidal Masters files to your Sennheisers. The resulting sound is enough to make your ears weep. from £10/m / tidal.com