PSB M4U 4

Solid sound ; Smooth presentation ; Good detail and weight ; Comfortable and sturdy design

Bass is too rich and sludgy ; Sound could be more exciting ; Pricey

They’re not perfect, but these pricey in-ears are worth a listen for their easy-listening vibes

Clean, lively treble ; Energetic sound

Sound loses composure at high volume

An upbeat, unfussy pair of headphones that should find many fans

PSB Speakers’ Paul Barton is a quick learner. After decades designing his company’s speakers, he jumped into headphones with the PSB M4U 2 full-size, noise-canceling ’phones. The M4U 2 was hailed by critics and consumers alike, and his next design for...