Reference in-ear – Welcome Sennheiser's IE 900 [€1'299] as a new contender. Fitted inside an anodized aluminium-machined housing is a 7mm 16Ω driver covering 5Hz-48kHz at just 0.05% THD/94dB. There are three internal absorption chambers plus an acoustic vortex machined into the output funnel to optimize the driver's performance. Cable termination via MMCX plugs allows free plug'n'play with aftermarket leashes and the included cables with para-aramid reinforment end in 3.5mm, 2.5mm balanced and 4.4mm balanced. Also included are silicon and memory-foam ear tips in three sizes each and a zippered case.