The KH 420 represents the result of using the latest techniques in acoustical, electronic and mechanical design to bring a new benchmark in audio reproduction quality. In-house computer optimized drivers, a waveguide featuring Mathematically Modeled Dispersion™ (MMD™), flexible acoustical controls, various input options, and an extensive mounting hardware range allow the KH 420 to be used in diverse acoustical conditions, with any source equipment, and in a wide variety of physical locations.
The KH 420 has been designed for use as a mid-field or main monitor. It is particularly well-suited for use in music, broadcast, and post production studios for tracking, mixing, and mastering. The KH 420 can be used free-standing or flush mounted into a wall, and, in multichannel systems, can be mixed freely with other loudspeakers in the range.

Technical Data

Acoustics -3 dB free field frequency response 26 Hz - 22 kHz, ± 3 dB Pass band free field frequency response 28 Hz - 20 kHz, ± 2 dB Self generated noise level at 10 cm < 20 dB(A) Total harmonic distortion < 0.5 % at 95 dB SPL at 1 m > 120 Hz Max. SPL in full space / calc. in half space at 3% THD at 1m 116.4 / 122.4 dB SPL (averaged between 100 Hz and 6 kHz) Bass capability: Max. SPL in half space at 3% THD at 1m 109.9 dB SPL (averaged between 50 Hz and 100 Hz) Max. short term SPL with IEC-weighted noise (IEC 60286-5) at 1 m, in typical listening conditions 109 dB(C) SPL Max. short term SPL with music material at 2.3 m, in typical listening conditions (pair) 103 dB(C) SPL (full range) 109 dB(C) SPL (with subwoofer) Max. long term SPL with pink noise at 2.3 m, in typical listening conditions (single/pair) 90 / 96 dB(C) SPL (full range) 90 / 96 dB(C) SPL (with subwoofer) Electronics Bass / Midrange / Treble Class AB amplifiers, cont. (peak) output power* 295 W (330 W) / 130 W (140 W) / 130 W (140 W) Controller design Analog, active Crossover - Frequencies 570 Hz / 2 kHz Crossover - Slope 24 dB/oct Equalization - Bass 0; -2.5; -5; -7.5 dB Equalization - Mid 0; -1.5; -3; -4.5 dB Equalization - High 1; 0; -1; -2 dB Parametric Equalizer Bypassable Parametric Equalizer - Gain +4 ... -12 dB Parametric Equalizer - Frequency Bypass, 25 ... 80 Hz, 50 ... 160 Hz, 100 ... 320 Hz Parametric Equalizer - Q 1 ... 8 Protection circuitry Excursion limiter: Low Peak limiter: Low Thermo limiters: Low, Mid and High Overheat: Amplifiers Displays, indicators - power on Neumann logo “White” Displays, indicators - limit / clip Neumann logo “Red” Mains Power Supply, voltage; frequency 100-240 V~, 50/60 Hz Power consumption - idle 60 W (+5 W when DIM 1 fitted) Power consumption - full output 800 W Mechanics Cabinet surface finish, colour Painted wood and polyurethane,  metallic anthracite. Aluminum electronics panel, Black. Baffle cover Optional removable metal grille Operating conditions +10° C to +40° C (+50° F to +104° F), <90% RH, non-condensing Transport/storage condition -25° C to +70° C (-13° F to 158° F), <90% RH, non-condensing Drivers Magnetically shielded Woofer 265 mm (10") Midrange 76 mm (3") Tweeter 25 mm (1") Cabinet design Vented, dual ports on front panel Mounting points 8 x M5 on rear Product dimensions (height x width x depth), mm (inches) 645 x 330 x 444 mm (25 3/8" x 13" x 17 1/2") External volume 93 liters Product Weight 35 kg (77 lbs 3 oz) (+ 100 g (3 oz) when DIM 1 fitted) Packed dimensions (height x width x depth), mm (inches) 775 x 610 x 590 mm (23 1/4" x 15" x 14 1/8") Packed weight and cube 41.0 kg (90 lbs 6 oz), 0.279 m³ Delivery includes 1x KH 420 3x Power cables (Euro, UK, USA) 1x Operating manual 1x Getting Started Quickly Guide