$ 4,900.00

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.

Product Feature Benefit to the Customer
  Computer mechanically modeled three-way cabinet design using Low resonance Integral Molding™ (LRIM™) materials
No standing wave resonances inside cabinet
Reduced intermodulation distortion in midrange for a more transparent sound
Reduced cabinet resonances
  New in-house simulated magnetically shielded drivers
Latest modeling techniques used to minimize non-linear (intermodulation) distortion
For safe use near magnetic storage media
  Powerful alloy fabric dome tweeter with built-in grille
Low-distortion high-frequency reproduction
Robust against accidental physical damage
  Fabric dome, neodymium magnet, midrange driver
Dedicated driver reproduces important midrange frequencies, which is especially important for speech and vocals
Light weight dome has better transient response and less breakup modes than cone designs
High power magnet reduces harmonic and intermodulation distortion
  Long throw bass driver with Extremely Linear Force Factor™ (ELFF™) and flow optimized die cast basket
Linear pistonic motor gives a very low harmonic distortion even at high excursions
Reduced air noise and improved rocking modes
  High-capacity flow-optimized bass reflex ports with pipe damped
Reduced compression at high output levels
No coloration from organ pipe resonance
  Elliptical Mathematically Modeled Dispersion™ (MMD™) waveguide, with wide horizontal and narrow vertical dispersion
Smoother off-axis response
More forgiving of diverse acoustical environments
Freedom of movement across the mixing console
Reduces reflections off the mixing console
  Two-color dimmable Neumann logo
Displays operation status and activation of the extensive protection system
Dimmable for low lighting level conditions or behind the screen applications
  Electronics panel with generously dimensioned integrated Accelerated Heat Tunneling™ (AHT™) heat sink
Improved heat dissipation leading to increased electronics reliability
  Powerful analog class AB amplifiers with large headroom and overheat limiting
Improved transient response, reliability Assurance of safety
  Fast-acting independent thermo limiters for woofer, midrange dome and tweeter to protect the voice coils. Woofer soft clip and excursion limiters.
Allows extraction of the maximum performance from the system without reducing reliability
  Production consistency due to individual hand-alignment in final test
Any KH 420 is “pair-matched” to any other KH 420
  4-position bass, low-mid and treble acoustical controls and easy to use parametric equalizer
More control in diverse acoustical environments
Repeatable acoustical settings after moving loudspeakers
  Wide range input gain and output level controls
Easier interfacing with signal sources
  Ground lift
Reduced noise in electrically noisy environments and over-comes ground loops
  Optional (DIM 1) digital XLR/BNC inputs and buffered BNC output
For flexible and trouble-free digital interconnectivity(24 bit, 192 kHz, AES3 and S/P-DIF)
  Optional (DIM 1) lipsync delay 
(0 … 10/12 frames)
To align audio and video signals
  Optional (DIM 1) time-of-flight delay 
(0 … 400 ms)
To compensate for listening distance differences
  Universal dual (bass and mid/treble) switched-mode power supplies (100 … 240 V)
One version works in any country and robust to poor quality mains supply
Dual supply improves transient response
  Fully documented extensive mounting hardware options
More flexibility in mounting cabinets in more diverse locations and backwards compatibility with previous models
Mechanically compatible with O 410, KH 870 and O 870
Easy advanced planning for installations
  Optional robust metal grille
Can be used, if required, to protect the drivers
  Optional transportation accessories
Robust wooden flight case for transport and storage

−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)
Analog Input
Infrasonic filter: frequency/slope 9 Hz; 18 dB/oct
Input XLR, electronically balanced
Impedance, electrically balanced 14k Ohms
Input gain control (sensitivity) 0 dB to −15 dB
Output level control 94, 100, 108, 114 dB SPL
CMRR > 56 dB @ 100 - 16 kHz
Max. analog input level +24 dBu (18 dBu for analog delayed)
Digital Input (when optional DIM 1accessory is fitted)
Format BNC AES3, S/P-DIF
Impedance BNC, unbalanced 75 Ω (input/output)
Format XLR AES3
Impedance XLR, balanced 110 Ω (input)
Input switching Analog, Digital A, Digital B, Digital A+B (all available with and without delay)
Digital converter: resolution, design 16 … 24-bit DAC, Δ∑
Digital converter: sampling rate 22.05, 24, 32, 44.1, 48, 64, 88.2, 96, 176.4, 192 kHz
Digital sensitivity −18 dBFS = 100 dB SPL at 1 m
A-D-A, D-A dynamic range >116 dB(A), >123 dB(A)
THD+N: analog delayed, digital < -104 dB, < -106 dB
Maximum Audio-Video/lip sync and Time-of-Flight delay 409.5 ms/ 140.87 m (462' 2")
Audio-Video/lip sync max. frames 10.2 (40 ms) frames,
12.3 (33 ms) frames
Resolution: time/distance 0.1 ms / 3.4 cm (1 3/8”)
Latency D-A (A-D-A) 0.22 - 1.85 ms (0.54 ms)
Delay setting acknowledgement Neumann logo “Red” 1 flash
Delay setting acknowledgement Neumann logo “Red” continuous flashes
Mains Power Supply, voltage; frequency 100-240 V~; 50/60 Hz
Bass / Midrange / Treble Class AB amplifiers, cont. (peakoutput 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
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 1fitted)
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


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