Krell amplifiers are justifiably famous for their ability to present music accurately and dramatically, and the 402e, while not the largest, is a very substantial amp which shares the Krell characteristics and build standard. Here are some of the features of these marvellous amplifiers, from the Krell literature: Active Cascode Topology eliminates global negative feedback, only nested local feedback is employed around individual gain blocks. The result is an extraordinarily open, liquid, effortless sound. The signal path incorporates Krell Current Mode and CAST circuitry using proprietary multiple-output current mirrors in a complementary and balanced arrangement for extraordinary open loop linearity. Evolution circuit topology breaks through bandwidth limitations of conventional designs resulting in near perfect performance in the audible range. A complete Evolution (source, preamplifier, amplifier) system, connected in CAST, reduces the number of voltage gain stages to the minimum, one. The resulting noise floor is approaching the theoretical limit of technology. All Evolution amplifiers feature massive power supplies and make use of extensive electrical and magnetic shielding to keep radiated interference out of critical amplifier circuits. Internal high current line conditioning circuitry filters RF noise on the AC mains, as well as compensating for asymmetric power waveforms and DC on the mains. The rails powering the amplifiers' low level and gain stages are regulated twice for total immunity from fluctuations in the AC mains and virtually noise-free output. Advanced microprocessor control monitors critical operational parameters. Bias, load impedance, regulator output voltages and operating temperatures are continuously monitored. Krell 402e Specifications: 400 W, 800 W (8, 4 Ohms); 2 x 2200VA Transformer; Krell Current Mode; Evolution "CAST" Input; 188,000 Microfarads of Filter Capacitance; 12 VDC Triggers.