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Audio Developments AD256

6 to 12 Input Frame Handmade Portable Mixer 

AD256 is another addition to the Audio Developments Ltd range of portable mixers, having comprehensive facilities set out in an ergonomically friendly design and all contained within a robust and rugged aluminium case with a relatively small footprint. 

The features and specification are based on the well established AD255 Mixer. Input channel limiter, continuously variable HPF and mute switch are the main additions. As with the other models within the range, professional components are used throughout - including Penny and Giles 100mm, long-stroke, conductive plastics faders. 

Location sound professionals now require multi-track record facilities; the channel direct outputs provide the necessary features. By use of an additional switch these outputs can source other signals if the direct signal is not required, (Main Output and Auxiliaries). This without compromising the simplicity of operation and reliability as with its counterpart the AD255. 

Features

  • Low Noise Mic Amplifier with powering for 48V Phantom and 12V Tonader (TA) powering
  • 6 to 12 Input Frame, mic or line selection
  • A simple, but effective, 3 Band EQ, proved and approved under field conditions, in use throughout the AD140 Series of mixers
  • Inputs are balanced and protected against radio-frequency interference. A continuously variable high-pass-filter protects against low-frequency saturation
  • Main Stereo Output is Transformer Balanced and has separate left and right fader control
  • Two Auxiliary Outputs are Transformer Balanced and have separate master rotary controls. Auxiliary 1 & 2 are routed from each input using 3 position switch (off, pre & post fader). Auxiliary 2 has a rotary level control on each input
  • A Mono Output of the left and right signals is also Transformer Balanced
  • Direct Outputs from each input channel are Unbalanced using a very low output impedance drive amplifier enabling high drive capability and minimising line interference
  • Limiters are incorporated on both Inputs and Outputs. The main output limiter can be linked for stereo operation. LEDs indicate limiting action
  • Two LCD meters display - either PPM or VU - main output, auxiliary output and PFL levels of each input. Useful for monitoring level at a direct output. Battery level and monitor status (Direct or Return) are also indicated. Back-light illumination is also included. 
  • Internal oscillator at either 1kHz or 10kHz frequency. The oscillator signal replaces the signal on the output when selected. 
  • An Internal Mic enables the mixer operator to communicate with the main output (SLATE), with each auxiliary and an external outstation (EXT). The outstation (Private Line) receives a monitor signal, selected using a series of push-button switches. 
  • The Headphone Monitor may be switched between main output, auxiliary outputs and returns. PFL overrides the selected monitor signal. Monitor selection allows left, right, left/right, auxiliary 1, auxiliary 2, auxiliary 1 + 2 and returns to be routed to the headphone output. An M-S matrix amplifier can be inserted to main or auxiliary outputs in the M-S domain. 
  • An Electronically Balanced Stereo Tape Return appears on a pair of jack sockets on the connector panel 
  • All Inputs and Outputs are presented on one surface on the case. The inputs, main output and direct outputs are on XLRs. Auxiliary outputs, returns and headphone output are on 1/4″ jack sockets.
  • The mixer can be powered from an internally fitted battery box (8 x C cells) or an external DC source (12V to 15V DC)

TECHNICAL SPECIFICATIONS

  • Reference: 0dB = 775mV @ 1kHz unless otherwise stated 
  • Max Gain Mic: 80dB 
  • Max Gain Line: 50dB 
  • Max Input Level 
    • Mic
      • Max Gain: 44dB 
      • Min Gain: +6dB
    • 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 Transformer Bal. Mono Transformer Bal. (600R load) 
  • +18dBm 
    • Direct out: Unbalanced 
    • Headphone: Unbalanced (600R load) 
    • TB Send: Unbalanced (600R load) 
  • Output Impedance
    • <60R at L-R & Mono 
    • <20R at Direct Out & Monitor 
    • <20R at TB Send 
  • Frequency Response
    • 0: -1dB L-R Mono 
    • 0: -1.5dB Monitor Paths 
  • Harmonic Distortion
    • <0.05% @ 1kHz @ 0dBm Output
    • <0.15% @ 40Hz to 15kHz @ +15dBm Output 
  • Overload Indicator Illuminates @ +15dBu at the Pre-Fader Point
  • 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: 20-200Hz Variable 12db/Octave 
  • Output Limiter 
    • Threshold: +8dB 
    • Ratio: 7 : 1 
  • Attack 2 Settings Internally Switchable 
    • 1: 4mS 
    • 2: 0.8mS
  • Release Settings Internally Switchable 
    • 1: 250mS 
    • 2: 80mS 
  • Factory Setting: Slow 
  • Current Consumption
    • 220mA (6 Input) 
    • 12V DC Supply 
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