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KH 420 - Active Studio Monitor
General Description

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

Block Diagram (Download)




 KH 420 Front View 
White Background


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