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Thanks for e clarification, pal. I'm more clear regards to semi-open issue now. Yep, i understand tt the bass is not as much as closed cans, cos they leak. For me, i'm using FiiO E5 amp now, as a starter. Outdoor/MRT use, i'm on SonyErissonW995 (source), to FiiO E5, to ATH-WM55/Bose A.E Triport currently. For this setup, e WM55 has quick & punchy bass, maybe due to its low impedence, compared to my other cans. So now i understand open/semi-open cans slightly take on e characteristics of its source & amplification. Think my next purchase is clear now

Hi guys, this is my 1st post in e forum. Local collector too, mainly headphones (not much of earbuds for me). So pls guide me along in this new hobby & interest of mine i started in Dec 2010. I understand e basic differences between Open & Closed cans, but came across e AKG K 142 HD & K 242 HD, which are "semi-open" cans. What do they mean by "semi-open", & do they combine e properties of both Open & Closed air, where we can enjoy a better acoustic vocals due to semi-open-airy feel, & also can enjoy abit of sharp punchy bass with semi-closed portion, holding in e lower-end Bass? Does it also mean e K142 & K242's semi-open design is e answer for those who wants open-cans on public transport, but w/o ppl ard to hear clearly wad we're listening? cos i alr own a Senn HD 515 (open) & Pioneer HDJ 500 (closed) to cover both spectrum of vocals/acoustic as well as heavy bass, with some others like Bose A.E triport, HD 465, PX200II for in-betweens; & now looking for something in e middle, so seriously considering e K 242 HD as my next purchase. Thanks for advices in advance.