Product Overview
The Neumann KH420 features in-house computer-optimized drivers, a waveguide featuring Mathematically Modeled Dispersion™ (MMD™), flexible acoustical controls, various input options, and an extensive mounting hardware range that allow it to be used in diverse acoustical conditions with any source equipment and in a wide variety of physical locations.
The KH420 is designed for use as a mid-field or main monitor. It is well-suited for use in music, broadcast, and post-production studios for tracking, mixing, and mastering. The KH420 can be used free-standing or flush mounted into a wall. In multi-channel systems it can be mixed freely with other loudspeakers in the range.
Includes
- (1) KH420 3-Way Active Midfield Studio Monitor
- (3) Power cables (Euro, UK, USA)
- (1) Operating manual
- (1) Getting Started Quickly Guide
Features
- Computer mechanically modeled 3-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
- 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
- Lightweight 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, mid range 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 KH420 is "pair-matched" to any other KH420
- 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, 192kHz, AES3 and S/P-DIF)
- Optional (DIM 1) lipsync delay (0 -10/12frames)
- To align audio and video signals
- Optional (DIM 1) time-of-flight delay (0 - 400ms)
- To compensate for listening distance differences
- Universal dual (bass and mid/treble) switched-mode power supplies (100 - 240V)
- 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 O410, KH870 and O870
- 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
Specifications
- Acoustics:
- -3dB free field frequency response: 26Hz - 22kHz, ±3dB
- Pass band free field frequency response: 28Hz - 20kHz, ±2dB
- Self-generated noise level @ 10cm: < 20dB(A)
- Total harmonic distortion < 0.5% @ 95dB SPL @ 1m: > 120Hz
- Max. SPL in full space/calc. in half space at 3% THD @ 1m: 116.4/122.4dB SPL (averaged between 100Hz and 6kHz)
- Bass capability: Max. SPL in half space at 3% THD @ 1m: 109.9dB SPL (averaged between 50Hz and 100Hz)
- Max. short term SPL with IEC-weighted noise (IEC60286-5) @ 1m, in typical listening conditions: 109dB(C) SPL
- Max. short term SPL with music material at 2.3m, in typical listening conditions (pair):
- 103dB(C) SPL (full range)
- 109dB(C) SPL (with subwoofer)
- Max. long term SPL with pink noise @ 2.3m, in typical listening conditions (single/pair):
- 90/96dB(C) SPL (full range)
- 90/96dB(C) SPL (with subwoofer)
- Analog Input:
- Infrasonic filter: frequency/slope: 9Hz; 18dB/oct
- Input: XLR, electronically balanced
- Impedance, electrically balanced: 14kΩ
- Input gain control (sensitivity): 0dB to -15dB
- Output level control: 94, 100, 108, 114dB SPL
- CMRR: > 56dB @ 100 - 16kHz
- Max. analog input level: +24dBu (18dBu for analog delayed)
- Digital Input (when optional DIM1 accessory is fitted):
- Format BNC: AES3, S/P-DIF
- Impedance BNC, unbalanced: 75Ω (input/output)
- Format XLR: AES3
- Impedance XLR, balanced: 110Ω (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, [Delta Sigma type]
- Digital converter: sampling rate: 22.05, 24, 32, 44.1, 48, 64, 88.2, 96, 176.4, 192kHz
- Digital sensitivity: -18dBFS = 100dB SPL @ 1m
- A-D-A, D-A dynamic range: >116dB(A), >123dB(A)
- THD+N: analog delayed, digital: < -104dB, < -106dB
- Maximum Audio-Video/lip sync and Time-of-Flight delay: 409.5ms/140.87m (462' 2")
- Audio-Video/lip sync max. frames: 10.2(40ms)frames, 12.3(33ms)frames
- Resolution: time/distance: 0.1ms/3.4cm (1 3/8”)
- Latency D-A (A-D-A): 0.22 - 1.85ms (0.54ms)
- Delay setting acknowledgement: Neumann logo "Red" 1 flash
- Delay setting acknowledgement: Neumann logo "Red" continuous flashes
- Mains Power Supply, voltage; frequency: 100-240V~; 50/60Hz
- Electronics:
- Bass / Midrange / Treble Class AB amplifiers, cont. (peak) output power*: 295W (330W)/130W(140W)/130W(140W)
- *THD+N < 0.1% with limiter deactivated
- Controller design: Analog, active
- Crossover - Frequencies: 570Hz/2kHz
- Crossover - Slope: 24dB/oct
- Equalization:
- Bass: 0; -2.5; -5; -7.5dB
- Mid: 0; -1.5; -3; -4.5dB
- High: 1; 0; -1; -2dB
- Parametric Equalizer: Bypassable
- Parametric Equalizer - Gain: +4 ... -12dB
- Parametric Equalizer - Frequency: Bypass, 25 ... 80Hz, 50 ... 160Hz, 100 ... 320Hz
- 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: 100-240V~, 50/60Hz
- Power consumption - idle: 60W (+5W when DIM1 fitted)
- Power consumption - full output: 800W
- Mechanics:
- Cabinet surface finish, color: 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: 10" (265mm)
- Midrange: 3" (76mm)
- Tweeter: 1" (25mm)
- Cabinet design: Vented, dual ports on front panel
- Mounting points: 8x M5 on rear
- Dimensions: 25-3/8" H x 13" W x 17-1/2" D (645 x 330 x 444mm)
- External volume: 93liters
- Weight: 77lbs, 3oz. (35kg), + 3oz. (100g) when DIM1 is fitted
- Packed Dimensions: 23-1/4" H x 15" W x 14-1/8" D (775 x 610 x 590mm)
- Packed Weight and cube: 90lbs, 6oz. (41kg), 0.279m³
