KH 420 – Active Studio Monitor

KH 420 – Active Studio Monitor

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

 

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 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 103 dB(C) SPL (full range)
109 dB(C) SPL (with subwoofer)
Max. short term SPL with music material at 2.3 m, in typical listening conditions (pair) 40 and 90 Hz
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 1 accessory 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, ΔΣ
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
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 +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

Accessories

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