Neumann KH 420 G
The KH 420 is a three-way tri-amplified monitor with thermally protected Class AB amplifiers (330 W and two times 140 W). Just like the drivers, its Mathematically Modeled Dispersion™ (MMD™) waveguide is engineered for optimum precision. Sound distributed in a horizontally precise manner ensures flexibility in the listening position; the narrower vertical dispersion reduces the negative effects of nearby reflections, for example from a desk or mixing console. The dispersion of the KH 420 is deliberately designed to be narrower, to guarantee reference sound at longer working distances.
BEST WORKING ENVIRONMENT: CLOSE TO PROFESSIONAL EARS
The KH 420 is designed for midfield applications and as main monitor in project, music, broadcast and post-production studios for recording, mixing and mastering. And in a multi-channel system, it can also be freely combined with all other Neumann studio monitors.
PORTS AND HIGH DYNAMICS: NO LONGER A CONTRADICTION
With its tri-channel amplifiers the KH 420 also realizes sound pressures of up to 122.4 dB. And it thereby retains high-resolution and neutral representation across the entire frequency response. This also includes an exceptional bass response down to 26 Hz. Despite using ports, there is no “overhang” or audible resonance in the low frequency range and the transient response is precisely controlled at all times.
The computer modeled chassis is constructed of LRIM™ materials which eliminates standing wave resonances and suppresses intermodulation distortion, especially in the midrange.
For demanding treble, our own specially developed, powerful alloy fabric dome ensures distortion-free reproduction. The fabric dome captures the midrange with utmost precision. Its ultralight material and the powerful neodymium magnet enable a significantly better transient response with considerably less distortion than comparable midrange drivers.
DIGITAL INPUT AND DELAY OPTION
The Digital Input Module DIM 1 expands the loudspeaker electronics by a digital XLR input, a digital BNC input and a digital BNC output (192 kHz/24 Bit) for flexible digital signal links. With the delay function (adjustment range 0 - 400 ms) of the DIM 1, the audio signal can be delayed to ensure audio-visual synchronization (lip sync). In addition, the high resolution of the delays (0.1 ms) allows equalization of the propagation delays. The delay can be added to both inputs (digital and analog). The KH 420 can be retrofitted with a DIM 1.
| Free field frequency response ±6 dB |
25 Hz … 22 kHz |
| Free field frequency response ±3 dB |
26 Hz … 22 kHz |
| Free field frequency linearity deviation between 100 Hz and 10 kHz |
± 1.2 dB |
| Reproduction accuracy between 100 Hz and 10 kHz: 100%, 80%, 50% of loudspeakers produced |
±0.78; ±0.36; ±0.22 dB |
| Self-generated noise at 10 cm (with input gain set to 100 dB SPL for 0 dBu) |
<20 dB(A) SPL |
| Sine wave output with a THD < 0.5 % at 1 m in half space |
95 dB SPL (>100 Hz) |
| Max. SPL calc. in half space at 3% THD at 1m (averaged between 100 Hz and 6 kHz) |
122.4 dB SPL |
| Max. SPL in full space at 3% THD at 1m (averaged between 100 Hz and 6 kHz) |
116.4 dB SPL |
| Bass capability: Max. SPL in half space at 3% THD at 1m (averaged between 50 Hz and 100 Hz) |
109.9 dB SPL |
| Max. short term SPL with IEC-weighted noise (IEC 60268-5) 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 / full range) |
103 dB(C) SPL |
| Max. short term SPL with music material at 2.3 m, in typical listening conditions (pair with subwoofer) |
109 dB(C) SPL |
| Max. long term SPL with pink noise at 2.3 m, in typical listening conditions (single / pair full range) |
90 / 96 dB(C) SPL |
| Max. long term SPL with pink noise at 2.3 m, in typical listening conditions (single / pair with subwoofer) |
90 / 96 dB(C) SPL |
| Analog input(s) |
XLR: analog electronically balanced |
| Analog input impedance |
>14k Ohms |
| Max. input level |
+24 dBu (DIM 1: 18 dBu for analog delayed) |
| Common mode rejection ratio (CMRR) |
>56 dB @ 15kHz |
| Input gain control (sensitivity) |
0 dB ... -15 dB |
| Output level control (output level in 1 m based on 0 dBu input level) |
94; 100; 108; 114 dB SPL |
| Controller design |
Analog; active |
| Crossover frequency |
570 Hz and 2.0 kHz |
| Crossover slope |
24 dB/oct; 4th order |
| Equalization: Bass |
0; -2.5; -5; -7.5 dB |
| Equalization: Mid |
0; -1.5; -3; -4.5 dB |
| Equalization: Treble |
+1; 0; -1; -2 dB |
| Equalization: Parametric EQ: Gain |
'+4 ... -12 dB |
| Equalization: Parametric EQ: Frequency |
Bypass, 25 ... 80 Hz; 50 ... 160 Hz; 100 ... 320 Hz |
| Equalization: Parametric EQ: Q |
1 ... 8 |
| Protection circuitry |
Independent thermo limiters for woofer, midrange dome and tweeter. Woofer soft clip and excursion limiters. Amplifier overheat. |
| Infrasonic filter: frequency; slope |
9 Hz; 18 dB/oct. |
| Display: On; Normal Operation |
Neumann logo “White” |
| Display: Limit / Clip / Errors / Protection /Boot Mute / Shut Down Mute |
Neumann logo “Red” |
| Display Brightness |
White: 100%/60%/30%/off; Red: 100%/60%/30% |
| Output power woofer amplifier (THD+N with limiter deactivated: 10%) |
330 W |
| Output power midrange amplifier (THD+N with limiter deactivated: 10%) |
140 W |
| Output power tweeter amplifier (THD+N with limiter deactivated: 10%) |
140 W |
| Output power woofer amplifier (THD+N with limiter deactivated: 0.1%) |
295 W |
| Output power midrange amplifier (THD+N with limiter deactivated: 0.1%) |
130 W |
| Output power tweeter amplifier (THD+N with limiter deactivated: 0.1%) |
130 W |
| Mains Power Supply: input voltage; frequency |
100-240V; 50/60 Hz |
| Power consumption (230 V / 100 V): Idle |
60 W (+5W when DIM 1 fitted) |
| Power consumption (230 V / 100 V): Full output |
800 W |
| Cabinet material |
Wood cabinet, polyurethane waveguide, aluminum electronics panel |
| Cabinet surface finish; color (front / back) |
Painted; metallic anthracite (RAL 7021) / black (RAL 9005) |
| Operating conditions |
+10° C to +40° C (+50° F to +104° F); <90% RH, non-condensing |
| Transport/storage conditions |
-25° C to +70° C (-13° F to 158° F); <90% RH; non-condensing |
| Woofer |
265 mm (10") with magnetic shielding |
| Midrange |
75 mm (3") with magnetic shielding |
| Tweeter |
25 mm (1") with protecting black metal grille |
| Mounting points |
8 x M5 on rear panel |
| Product dimensions (height x width x depth) |
645 x 330 x 444 mm (25 3/8" x 13" x 17 1/2") |
| External net volume |
93 liters |
| Product weight |
35.0 kg (77 lbs 3 oz) (+ 100 g (3 oz) with DIM 1 fitted) |
| Cabinet weight when electronics remote located |
30.3 kg (66 lbs 13 oz) (+ 100 g (3 oz) with DIM 1 fitted) |
| Packed dimensions (height x width x depth), mm (inches) |
775 x 610 x 590 mm (30 1/2" x 15" x 14 1/8") |
| Packed weight |
41.0 kg (90 lbs 6 oz) |
| Packed cube |
0.279 m³ |
