KRELL VANGUARD

摘要

Rated by Krell at 200W/8ohm, its Vanguard amplifier achieves a higher output in practice - 2×250W/8ohm and 2×380W/4ohm with sufficient headroom to accommodate peaks of 270W and 510W into 8 and 4ohm loads under dynamic conditions (all ＜ 1 % THD). A tight 13.6A current limit restricts the output to 350W/185W into 2/1ohm [see Graph 1, below] making the Vanguard about half as capable as Krell's 300 Duo [HFN Oct '14] into low impedance speaker loads. While Krell's literature states the Vanguard 'borrows design and construction from its iBias amplifiers' it's still not particularly clear whether the power amp is actually an iBias topology or not. Power consumption is improved over the 300 Duo at 74W (idle) while its distortion characteristics are different - the Vanguard offering a far steadier 0.015-0.025% THD over its full 200W rated bandwidth with a 0.0067-0.017% spread at 10W/8ohm from 20Hz-20kHz [see Graph 2, below].