KEF LSX

摘要

There are active speakers and active speakers. Some models claim to be 'active' but are really just powered, with a single amplifier within the speaker cabinet driving the tweeter and mid/bass unit via a conventional passive crossover, sometimes even with a stereo power amp in one speaker driving both it and a slave partner. True active speakers have their crossovers upstream of the amplification, with separate amp channels dedicated to each drive unit, and only carrying the frequency range appropriate to that driver. Then there are what one might consider 'hyper-active' speakers, with built-in ADCs and DACs, a range of inputs and even wireless music streaming, whether from a network source or online services, or straight from a phone, tablet or computer using Bluetooth or something similar.