Neumann KH 420 Active Studio Monitor

• 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

• Powerful analog class AB amplifiers with large headroom and overheat limiting

• 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 (0 … 10/12 frames)

• Optional (DIM 1) time-of-flight delay (0 … 400 ms)

• 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

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 full space / calc. 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:  109 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/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, Δ∑

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: 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: 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

• 1x KH 420

• 3x Power cables (Euro, UK, USA)

• 1x Operating manual

• 1x Getting Started Quickly Guide