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Neumann KH 420 - Active Studio Monitor Pair  From Neumann

Designed for use as a mid-field or main monitor, the KH 420 is an excellent choice for use in music, broadcast, and post production studios. 

Neumann USA


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Manufacturer's Description from Neumann

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.
  •  Computer mechanically modeled three-way cabinet design using Low resonance Integral Molding™ (LRIM™) materials
  •  New in-house simulated magnetically shielded drivers
  •  Powerful alloy fabric dome tweeter with built-in grille
  •  Fabric dome, neodymium magnet, midrange driver
  •  Long throw bass driver with Extremely Linear Force Factor™ (ELFF™) and flow optimized die cast basket
  •  High-capacity flow-optimized bass reflex ports with pipe damped
  •  Elliptical Mathematically Modeled Dispersion™ (MMD™) waveguide, with wide horizontal and narrow vertical dispersion
  •  Two-color dimmable Neumann logo
  •  Electronics panel with generously dimensioned integrated Accelerated Heat Tunneling™ (AHT™) heat sink
  •  Fast-acting independent thermo limiters for woofer, midrange dome and tweeter to protect the voice coils. Woofer soft clip and excursion limiters.
  •  Production consistency due to individual hand-alignment in final test
  •  4-position bass, low-mid and treble acoustical controls and easy to use parametric equalizer
  •  Wide range input gain and output level controls
  •  Ground lift
  •  Optional (DIM 1) digital XLR/BNC inputs and buffered BNC output
  •  Optional (DIM 1) lipsync delay 
  •  Optional (DIM 1) time-of-flight delay 
  •  Universal dual (bass and mid/treble) switched-mode power supplies (100 … 240 V)
  •  Fully documented extensive mounting hardware options
  •  Optional robust metal grille
  •  Optional transportation accessories
Neumann USA

About Manufacturer

Specializing in some of the finest microphones in the world, Neumann has develpoed a top name in the industry for consistency, reliability, and sonic excellence. With microphones suited for the entire range of studio recording (and more recently live application), Neumann microphones are often a first choice for uncompromised acoustic reproduction.


−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 1m116.4 / 122.4 dB SPL
(averaged between 100 Hz and 6 kHz)
Bass capability: Max. SPL in half space 
at 3% THD at 1m109.9 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 conditions109 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/slope9 Hz; 18 dB/oct
InputXLR, electronically balanced
Impedance, electrically balanced14k Ohms
Input gain control (sensitivity)0 dB to −15 dB
Output level control94, 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 1 accessory is fitted)
Impedance BNC, unbalanced75 Ω (input/output)
Format XLRAES3
Impedance XLR, balanced110 Ω (input)
Input switchingAnalog, Digital A, Digital B, Digital A+B (all available with and without delay)
Digital converter: resolution, design16 … 24-bit DAC, Δ∑
Digital converter: sampling rate22.05, 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 delay409.5 ms/ 140.87 m (462' 2")
Audio-Video/lip sync max. frames10.2 (40 ms) frames,
12.3 (33 ms) frames
Resolution: time/distance0.1 ms / 3.4 cm (1 3/8”)
Latency D-A (A-D-A)0.22 - 1.85 ms (0.54 ms)
Delay setting acknowledgementNeumann logo “Red” 1 flash
Delay setting acknowledgementNeumann logo “Red” continuous flashes
Mains Power Supply, voltage; frequency100-240 V~; 50/60 Hz
Bass / Midrange / Treble Class AB amplifiers, cont. (peak) output power*295 W (330 W) / 130 W (140 W) / 130 W (140 W)
Controller designAnalog, active
Crossover - Frequencies570 Hz / 2 kHz
Crossover - Slope24 dB/oct
Equalization - Bass0; -2.5; -5; -7.5 dB
Equalization - Mid0; -1.5; -3; -4.5 dB
Equalization - High1; 0; -1; -2 dB
Parametric EqualizerBypassable
Parametric Equalizer - Gain+4 ... -12 dB
Parametric Equalizer - FrequencyBypass, 25 ... 80 Hz, 50 ... 160 Hz, 
100 ... 320 Hz
Parametric Equalizer - Q1 ... 8
Protection circuitryExcursion limiter: Low
Peak limiter: Low
Thermo limiters: Low, Mid and High
Overheat: Amplifiers
Displays, indicators - power onNeumann logo “White”
Displays, indicators - limit / clipNeumann logo “Red”
Mains Power Supply, voltage; frequency100-240 V~, 50/60 Hz
Power consumption - idle60 W (+5 W when DIM 1 fitted)
Power consumption - full output800 W
Cabinet surface finish, colourPainted 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
DriversMagnetically shielded
Woofer265 mm (10")
Midrange76 mm (3")
Tweeter25 mm (1")
Cabinet designVented, dual ports on front panel
Mounting points8 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 volume93 liters
Product Weight35 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 cube41.0 kg (90 lbs 6 oz), 0.279 m³
Delivery includes1x KH 420
3x Power cables (Euro, UK, USA)
1x Operating manual
1x Getting Started Quickly Guide
Mounting on a floor stand(e.g. K&M 26750, 26735)
KH 420 + LH 41 + LH 28 + stand
KH 420 + LH 41 + LH 36 + LH 28 + stand
Mounting on a lighting stand
KH 420 + LH 41 + LH 29 + stand
KH 420 + LH 41 + LH 36 + LH 29 + stand
Mounting on subwoofer
KH 420 + LH 41 + LH 28 + pole + KH 870
KH 420 + LH 41 + LH 36 + LH 28 + pole + KH 870
KH 420 + LH 41 + LH 36 + LH 37 + KH 870
KH 420 + LH 41 + LH 37  + KH 870
Mounting on a wall
KH 420 + LH 42 + LH 45 + wall
Mounting off a ceiling
KH 420 + LH 42 + LH 43 + ceiling
KH 420 + LH 42 + LH 46 + ceiling
Mounting off a lighting or truss bar
KH 420 + LH 42 + LH 29 + G-clamp + bar
Other accessories
DIM 1, FKH 420, GKH 420 B, REK 4, CP 2, CP 5, CP 10, CP 15, CP 20, CP 25, CP 30





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