Though the Purple LTD is tuned the same as the other Vibro headphones, due to the differences in wood, listeners may find this version to be a bit faster and more substantial, with a more resounding sub-bass. An extremely hard, dense wood, purpleheart makes for a smooth, full sound with very natural decay. The soundstage is wider and deeper than in the MK I, and the treble and bass further extended—without becoming booming or exaggerated. By sealing the bass ports (three on each cup) with the included plugs, you can adjust the lower end by a few decibels to suit your taste.

To learn more, check out ZMF’s sound signature graph and this review on Head-Fi.