AD-256 Mezclador Estéreo 6 y 8 Entradas 2 Salidas y 2 Auxiliares

AD-256 es otro desarrollo de Audio Developments Ltd en el rango mezcladores portátiles, con un diseño ergonómico y fácil contenido dentro de una carcasa de aluminio resistente. Las características y especificaciones se basan en el mezclador AD255. Limitador de entrada del canal, HPF continuamente variable y conmutador de mute son las principales novedades.

Las instalaciones profesionales de sonido requieren instalaciones multi-pista de grabación, y las salidas de canal directo deben proporcionar las características necesarias. Mediante el uso de un interruptor adicional estas salidas se pueden obtener de otras señales, si la señal directa no es requerida, (salida principal y auxiliares). Esto sin comprometer la simplicidad de funcionamiento y fiabilidad, con su homólogo el AD255.

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  • Low noise microphone amplifier developed for AD140 series of mixers. Power is provided for 48V Phantom and 12V Tonader microphones
  • A simple but effective three band equaliser, proved and approved under field conditions, in use throughout the AD140 series of mixers
  • Inputs are transformer balanced and protected against radio-frequency interference. A high-pass filter protects against low-frequency saturation.
  • The main stereo output is transformer balanced and has separate left and right faders.
  • Two auxiliary outputs are transformer balanced and have separate master rotary controls. Auxiliary 1 & 2 are routed from each input using a 3 position switch (off, pre and post fader). Auxiliary 2 has a rotary level control
  • Limiters, which may be linked for stereo operation, are incorporated in the main output. Limiting is indicated by a pair of LEDs.
  • Direct outputs are unbalanced and driven from a very low impedance source with high drive capability.
  • Two LCD meters display - either PPM or VU - monitor the main output, auxiliary output and PFL of each input. Useful for monitoring level at a direct output. Battery level and monitor status (Direct or Return) are also indicated. Meters can be illuminated.
  • The frequency of the internal oscillator can be selected between 1KHz and 10KHz, it's output replacing the signal on the main output.
  • Via an internal microphone, the mixer operator is able to communicate with the main output (SLATE) and with an outstation (EXT) . The outstation normally receives a mono of the mixers main output.
  • The headphone monitor may be switched between main output, auxiliary outputs and return. All have PFL override. Monitor selectors allow left , right, left + right, auxiliary 1, auxiliary 2 and auxiliary 1 + 2 to be routed to the headphone socket. An M-S matrix amplifier may be inserted in order to decode main or auxiliary outputs in the M-S domain.
  • An electronically balanced stereo tape return appears on a pair of stereo jack sockets. An input calibration potentiometer is adjacent to the jack sockets on the connector panel.
  • All input and output connectors are presented on one surface of the case and in line with their corresponding modules.
  • The mixer receives power from 8 x C cells fitted internally or from an external 12V - 15V DC source.
  • REFERENCE 0dB=775mV at 1kHz unless otherwise stated.
  • MAX GAIN: MIC 80dB / LINE 50dB
  • MAX INPUT LEVEL: MIC @ MAX GAIN -44dB @ MIN GAIN + 0dB / LINE @ MAX GAIN -14dB @ MIN GAIN+20dB / STEREO-RETURN +18dB / TB RETURN +18dB
  • INPUT IMPEDANCE: MIC >2k5R / LINE >6k5R / STEREO-RETURN >100kR / TB RETURN >20kR
  • MIC POWERING 48V PHANTOM & 12V TONADER
  • MAX OUTPUT +23dBm L-R, AUX & MONO (600R LOAD) TRANSFORMER BAL / +18dBm DIRECT OUT, H'PHONE & EXT 1 (600R LOAD) UNBALANCED
  • OUTPUT IMPEDANCE <60R L-R, AUX & MONO / <20R DIRECT OUT, MONITOR & EXT 1
  • FREQUENCY 0: -1dB L-R, AUX & MONO & DIRECT OUT
  • RESPONSE 0: -1.5dB MONITOR PATHS
  • HARMONIC <0.05% @ 1kHz @ 0dBm OUTPUT
  • DISTORTION <0.15% @ 40Hz to 15kHz @ +15dBm OUTPUT
  • OVERLOAD ILLUMINATES @ +15dBu at the PRE-FADER INDICATOR
  • CROSSTALK <-70dB 40Hz to 15kHz
  • INTERGROUP & INTERCHANNEL
  • NOISE: MIC <-126dB EIN 20Hz to 20kHz; 200R SOURCE / LINE <77dB SNR 20Hz to 20kHz 0dBu IN & OUT
  • EQUALISATION HF: ±10dB @ 10kHz / LF: ±10dB @ 100Hz / MF: ±15dB
  • CENTRE FREQUENCY 2k5Hz Q=1.2
  • HPF: PRE-TRANSFORMER 12dB/OCTAVE -3dB @ 150Hz -3dB @ 90Hz
  • OUTPUT LIMITER THRESHOLD +8dB
  • RATIO 7:1
  • ATTACK 2 SETTINGS
  • INTERNALLY SWITCHABLE 1: 4mS / 2: 0.8mS
  • RELEASE 2 SETTINGS
  • INTERNALLY SWITCHABLE 1: 250mS / 2: 80mS
  • FACTORY SETTING: SLOW
  • CURRENT 240mA (6 INPUT)
  • CONSUMPTION 12V DC SUPPLY