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| 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 |
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| 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 Mounting on a lighting stand Mounting on subwoofer Mounting on a wall Mounting off a ceiling KH 420 + LH 42 + LH 46 + ceiling Mounting off a lighting or truss bar Other accessories |
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