KH 120 A KH 120 D Active Near-field Loudspeaker Operating Manual georg neumann gmbh · Ollenhauerstr. 98 · 13403 berlin · germany tel +49 (0)30 / 41 77 24-0 · fax -50 · headoffice@neumann.com · www.neumann.
Contents Important safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 The KH 120 studio monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Delivery includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Important safety instructions 1. Read these instructions. 2. Keep these instructions. Always include these instructions when passing the product on to third parties. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Only clean the product when it is not connected to the mains power supply. Clean only with a dry cloth. 7. Always ensure a free air flow around the cooling fins on the rear of the product. Do not block any ventilation openings.
Danger due to high sound pressure levels WARNING Danger of hearing damage due to sudden high sound pressure levels! Audio signals that are present at switch-on of the product or that can be present during operation, can create sudden, very high sound pressure levels which can damage your hearing. XX Always lower the output level of the audio source before connecting it to the loudspeaker or starting it (pressing “play”). This loudspeaker can be used for commercial purposes.
The KH 120 studio monitor Thank you for purchasing a Neumann studio monitor. The KH 120 features a Mathematically Modeled Dispersion™ Waveguide (MMD™), flexible acoustical controls, various input options and an extensive range of mounting hardware. This allows the loudspeaker to be used in diverse acoustical conditions, with any source equipment and in a wide variety of physical locations.
Product overview Front panel 1 2 2 1 Neumann logo • lights up white: loudspeaker is switched on and ready for operation • flashes red: loudspeaker’s protection system is active or A digital signal is selected via the SIGNAL SELECT rotary switch D but there is no valid digital signal connected 2 Bass reflex ports 5 3 On/off switch 4 IEC mains socket with protective ground contact 4 3 6 Bottom KH 120 A 5 DIP switches [1]–[4] [1] Switches the Neumann logo on/off [2] Dims the Neumann logo [3] No functi
7 8 9 7 8 9 Back panel KH 120 A 0 0 A A 7 ACOUSTICAL CONTROLS switches 8 OUTPUT LEVEL switch 9 INPUT GAIN control 0 Cooling fins A Threaded inserts for Neumann mounting hardware Back panel KH 120 D 7 8 9 7 8 9 7 ACOUSTICAL CONTROLS switches 8 OUTPUT LEVEL switch 9 INPUT GAIN control 0 0 A A 0 Cooling fins A Threaded inserts for Neumann mounting hardware B AES3 OUTPUT socket (BNC) C AES3 INPUT socket (BNC) D SIGNAL SELECT rotary switch E DELAY rotary switches EN 6 | KH 120 E D C B E
Installing and connecting the KH 120 CAUTION Danger of injury and material damage due to tipping/dropping of the product! If improperly mounted, the product and/or the mounting hardware (e.g. rack) can tip over or drop down. XX Always have the product mounted by a qualified specialist according to local, national and international regulations and standards.
Positioning the loudspeakers Distances X Carry out the following steps very accurately, since the more accurate the physical arrangement of the loudspeakers in the room, the more accurate the reproduction will be at the listening position . X Observe the recommended distances between the loudspeakers and your listening position (imperial dimensions are approximate): • Minimum: 0 .75 m (2 .5') • Recommended: 1 .0–2 .0 m (3'–6') • Maximum: 4 .
Connecting audio signals X Always use good quality cables with the correct impedance and appropriate termination to avoid signal drop outs and to achieve the maximum cable lengths shown below: Signal (connector) Impedance Cable length Connection Analog (RCA) low up to 10 m (30') via an adapter (RCA-XLR) to the ANALOG INPUT socket (XLR) 6 (see below) Analog (XLR) low up to 100 m (300’) directly to the ANALOG INPUT socket (XLR) 6 (see below) AES3 (BNC) 75 Ω up to 100 m (300') directly to the A
Connecting digital signals to the KH 120 D Connecting AES cables X KH 120 D Connect the digital AES3 or S/P-DIF-output signal of your audio source to the AES3 INPUT socket C of the respective KH 120 D . See picture below . The KH 120 D loudspeaker only supports non-encoded AES3 and S/P-DIF signals . Encoded signals such as MP3, DTS or Dolby Digital are not supported . X Make an appropriate setting (“DIGITAL A” or “DIGITAL B”) on the SIGNAL SELECT rotary switch D .
KH 120 D Wiring Source (XLR-F) 110 cable 56.2 1.2 mW 110 57 mW 54.9 112 mW Pin Signal 1 Shield 2 Signal + 3 Signal - Loudspeaker 75 cable (BNC) 187 26 mW Use E96 1% resistors AES3 on XLR to AES3 on BNC Connections This method brings impedance matching and level matching, but no source-receiver isolation . Use a resistor network to passively attenuate the XLR signal from 3 .1 V down to 0 .42 V and change the impedance from 110 Ω to 75 Ω .
Connecting/disconnecting the KH 120 to/from the mains power supply To connect the KH 120 to the mains power supply: XX Make sure that the on/off switch 3 is set to “OFF”. XX Connect the IEC connector of the supplied mains cable to the mains socket 4. 4 3 Power Source XX Connect the mains plug of the mains cable to a suitable wall socket. To disconnect the KH 120 from the mains power supply: XX Set the on/off switch 3 to “OFF”. XX Pull the mains plug out of the wall socket.
XX Use the ACOUSTICAL CONTROLS switches 7 to adjust the frequency response. Recommended frequency responses: • Studio applications: flat • Film applications: X-curve shape (see ANSI/SMPTE 202M) • Home applications: subjective evaluation ACOUSTICAL CONTROLS switches 7 Function Possible settings Bass Compensates for acoustical loading in the low frequency range due to nearby large solid boundaries (e.g. walls). 0, -2.5, -5, -7.
Recommended sound pressure levels: Application Sound pressure level Film 85 dB(C) Broadcast 79 to 83 dB(C) Music No defined reference levels If the Neumann logo flashes red, the loudspeaker’s protection system has been activated . To avoid this and achieve the desired output level, use larger loudspeakers or add a bass managed subwoofer to the system .
KH 120 D If a video delay compensation has already been made, add the time-of-flight difference (here: 0 .4 ms) to the setting already made . Example Video delay compensation on loudspeaker A: 2 x 40 ms/frame Desired time-of flight compensation for loudspeaker A: 0 .4 ms Time-of-flight compensation: 80 .4 ms This delay value can be made with these switch settings: 3 x 25 .6 ms, 2 x 1 .6 ms, 4 x 0 .1 ms .
Adjusting the brightness of the Neumann logo WARNING Danger of hearing damage due to unexpected high sound pressure levels! If the Neumann logo is switched off, it is not obvious whether the product is switched on or off. In this case, unexpected high sound pressure levels can cause hearing damage. XX Always set the audio sources connected to the loudspeaker to a low output level before they deliver an audio signal.
Problem Cause Solution There is hum or buzz coming from the KH 120 when the audio cable is connected. Bad cabling or ground loop in the installation. Check all cabling to eliminate the cause of the problem, change from unbalanced to balanced cabling, or use the ground lift switch (see page 15). For further information, please refer to the “Questions & Answers” section on the product page at www.neumann.com.
CMRR > 56 dB, 100 Hz to 10 kHz (ANALOG mode) > 56 dB, 100 Hz to 12 kHz (ANALOG DELAYED mode) Maximum input level 24 dBu (ANALOG mode) 18 dBu (ANALOG DELAYED mode) Digital input/output (KH 120 D only) Signal format BNC AES3, S/P-DIF Impedance BNC, unbalanced 75 Ω (input and output) Input switching Analog/Digital A/Digital B/Digital A+B Digital converter: resolution 16 … 24-bit Digital converter: sampling rates [kHz]* 22.05, 24, 32, 44.1, 48, 64, 88.2, 96, 176.
Operating conditions Ambient temperature +10 °C to +40 °C (+50 °F to +104 °F) Relative humidity max. 90 % (non-condensing) Power supply 100 to 240 V~, 50/60 Hz Transport/storage conditions Ambient temperature –25 °C to +70 °C (–13 °F to +158 °F) Relative humidity max.
Manufacturer Declarations Guarantee For the current terms and conditions of the product guarantee, please visit www.neumann.com. In compliance with the following requirements • WEEE Directive (2002/96/EC) Please dispose of the product at the end of its operational lifetime by taking it to your local collection point or recycling center for such equipment.
System Block Diagram/System-Blockdiagramm/Synoptique Système/ Diagrama de Bloques del Sistema 25.6 ms 1.6 ms 0.
Free-Field Response | Freifeld-Frequenzgang | Réponse en champ libre | Respuesta en frecuencia en campo libre II | KH 210 Group Delay | Gruppenlaufzeit | Temps de propagation de groupe | Retardo de grupo
Harmonic Distortion at 90 dB SPL | Klirrfaktor bei 90 dB SPL Distorsion harmonique à 90 dB SPL | Distorsión armónica total a 90 dB SPL Maximum SPL at 1 m (1% and 3%) | Maximaler SPL bei 1 m (1 % und 3 %) | Niveau SPL maximal, à 1 m (1% et 3%) | SPL máximo a 1 m (1 % y 3 %) KH 210 | III
Acoustical Controls | Akustikregler | Effet des correcteurs de compensation acoustiques | Regulador acústico IV | KH 210
Cumulative Spectral Decay | Zerfallsspektrum | Décroissance spectrale cumulée | Caída espectral acumulada Frequency (Hz) time (ms) KH 210 | V
Horizontal Directivity Plot | Horizontales Abstrahlverhalten Directivité horizontale | Directividad horizontal -24,0--21,0 -21,0--18,0 -18,0--15,0 -15,0--12,0 -12,0--9,0 -9,0--6,0 -6,0--3,0 -3,0-0,0 0,0-3,0 3,0-6,0 90 60 30 0 Angle (°) -30 -60 Frequency (Hz) VI | KH 210 16 00 0 20 00 0 80 00 10 00 0 12 50 0 50 00 63 00 40 00 25 00 31 50 20 00 12 50 16 00 10 00 80 0 63 0 50 0 40 0 31 5 25 0 20 0 16 0 12 5 -90
Vertical Directivity Plot | Vertikales Abstrahlverhalten Directivité verticale | Directividad vertical -24,0--21,0 -21,0--18,0 -18,0--15,0 -15,0--12,0 -12,0--9,0 -9,0--6,0 -6,0--3,0 -3,0-0,0 0,0-3,0 3,0-6,0 90 60 30 0 Angle (°) -30 -60 16 00 0 20 00 0 80 00 10 00 0 12 50 0 50 00 63 00 40 00 25 00 31 50 20 00 12 50 16 00 10 00 80 0 63 0 50 0 40 0 31 5 25 0 20 0 16 0 12 5 -90 Frequency (Hz) KH 210 | VII
Installation angles/Aufstellwinkel/Angles d‘installation/Ángulos de colocación 30° 22.5° 30° 60° 60° 90° 90° 1 00° 1 00° 1 1 0° 1 1 0° 1 2 0° 1 2 0° 1 50° VIII | KH 210 22.
Delay Lookup Table/Wertetabelle Delay/Tableaux de valeurs Delay/Tabla de valores Delay Switch 1 (25.6 ms) Position Time [ms] Switch 2 (1.6 ms) Distance [m] Distance [Imperial] [feet] Frames [inches] 50 Hz Time [ms] Distance [m] 60 Hz Distance [Imperial] [feet] Frames [inches] 50 Hz 60 Hz 0 0.0 0.000 0 0 0.0 0.0 0.0 0.000 0 0 0.0 0.0 1 25.6 8.806 28 11 0.6 0.8 1.6 0.550 1 10 0.0 0.0 2 51.2 17.613 57 9 1.3 1.5 3.2 1.101 3 7 0.1 0.1 3 76.8 26.
Delay Lookup Table/Wertetabelle Delay/Tableaux de valeurs Delay/Tabla de valores Delay Switch 3 (0.1 ms) Position Time [ms] Distance [m] Distance [Imperial] [feet] Frames [inches] 50 Hz 60 Hz 0 0.0 0.000 0 0 0.0 0.0 1 0.1 0.034 0 1 0.0 0.0 2 0.2 0.069 0 3 0.0 0.0 3 0.3 0.103 0 4 0.0 0.0 4 0.4 0.138 0 5 0.0 0.0 5 0.5 0.172 0 7 0.0 0.0 6 0.6 0.206 0 8 0.0 0.0 7 0.7 0.241 0 9 0.0 0.0 8 0.8 0.275 0 11 0.0 0.0 9 0.9 0.310 1 0 0.0 0.
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