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.Main Features:Computer mechanically modeled three-way cabinet design using Low resonance Integral Molding (LRIM) materials – No standing wave resonances inside cabinetReduced intermodulation distortion in midrange for a more transparent sound – Reduced cabinet resonancesNew in-house simulated magnetically shielded drivers – Latest modeling techniques used to minimize non-linear (intermodulation) distortionFor safe use near magnetic storage mediaPowerful alloy fabric dome tweeter with built-in grille – Low-distortion high-frequency reproductionRobust against accidental physical damage – Fabric dome, neodymium magnet, midrange driverDedicated driver reproduces important midrange frequencies, which is especially important for speech and vocalsLight weight dome has better transient response and less breakup modes than cone designsHigh power magnet reduces harmonic and intermodulation distortionLong throw bass driver with Extremely Linear Force Factor (ELFF) and flow optimized die cast basketLinear pistonic motor gives a very low harmonic distortion even at high excursionsReduced air noise and improved rocking modesHigh-capacity flow-optimized bass reflex ports with pipe dampedReduced compression at high output levelsNo coloration from organ pipe resonanceElliptical Mathematically Modeled Dispersion (MMD) waveguide, with wide horizontal and narrow vertical dispersionSmoother off-axis responseMore forgiving of diverse acoustical environmentsFreedom of movement across the mixing consoleReduces reflections off the mixing consoleTwo-color dimmable Neumann logoDisplays operation status and activation of the extensive protection systemDimmable for low lighting level conditions or behind the screen applicationsElectronics panel with generously dimensioned integrated Accelerated Heat Tunneling (AHT) heat sinkImproved heat dissipation leading to increased electronics reliabilityPowerful analog class AB amplifiers with large headroom and overheat limitingImproved transient response, reliability Assurance of safetyFast-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 reliabilityProduction consistency due to individual hand-alignment in final testAny KH 420 is pair-matched to any other KH 4204-position bass, low-mid and treble acoustical controls and easy to use parametric equalizerMore control in diverse acoustical environmentsRepeatable acoustical settings after moving loudspeakersWide range input gain and output level controlsEasier interfacing with signal sources Ground liftReduced noise in electrically noisy environments and over-comes ground loopsOptional (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 signalsOptional (DIM 1) time-of-flight delay (0 400 ms) To compensate for listening distance differencesUniversal dual (bass and mid/treble) switched-mode power supplies (100 240 V) One version works in any country and robust to poor quality mains supplyDual supply improves transient responseFully documented extensive mounting hardware optionsMore flexibility in mounting cabinets in more diverse locations and backwards compatibility with previous modelsMechanically compatible with O 410, KH 870 and O 870Easy advanced planning for installationsOptional robust metal grille – Can be used, if required, to protect the driversOptional transportation accessories – Robust wooden flight case for transport and storage