Nice review and comparison against the Philips Downtown... I've heard the Phipps twice, mostly because I'm looking to give a pair away as a Christmas gift this year, first time I heard them I was pretty impressed (judged them mostly against Koss DJ100 & Kplisch Image One, which are like, at both opposite ends of the spectrum by comparison).
Second time I gave them a go I wasn't so impressed, I think I was A/B'ing them against some open Senn and a pair of Aviators which might've been the problem (really different sound), but bass actually sounded weak which makes no sense.
I might try taking my MEElec HT-21 with me next time I give those Downtown a listen, from what I've seen the HT-21 would sound like less refined version of these Beyers. It's pretty interesting that Amazon has the Soundmagic P30 priced at less than half of what the DTX 501p go for ($40-ish vs $100?).
I'd be curious to find out if there are any differences between them besides the headband... (and slightly flashier outer cup design)
Edited by Impulse - 10/19/12 at 2:12am