Audio Developments AD 256 2021

30 days of use-without a scratch. S.N. : 023119

Features:

-Low noise microphone amplifier with powering for 48V Phantom and 12V Tonader (TA) powering.

-6 to 12 input frame, mic or line selection.

-A simple, but effective, three band equaliser, 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.

-The 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 a 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 the 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 microphone 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 of the case. The inputs, main output and direct outputs are on XLRs. Auxiliary outputs, returns and headphone output are on ¼ inch 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).