The number three has special meaning in musical history. The first notated meter in music history, for example, was three beats to a measure, indicated by a full circle. It seems esthetically appropriate, then, that the Dutch high-end label TRPTK, which was founded in 2014, started as a band of three (thus, “TRPTK”—sound it out) consisting of an audio engineer, Brendon Heinst, as well as his friends Luuk Meijssen and Nicky Regelink, both of whom have moved on. The current team is also a triptych, with Heinst still at the helm, and now joined by Moscow-born Maya Fridman (who is also his wife), and Ben van Leliveld. Ben was the longtime owner of Listening Matters, a high-end-audio boutique in the Netherlands, as well as Acoustic Matters, a consultancy firm for…