- AD245 - the new PICO - retains all the facilities, simplicity of operation and reliability of its predecessor (AD145), and has been designed for discerning sound engineers requiring Audio Developments' build and transparent sound quality.

- The ultra-low-noise microphone amplifier developed for the AD140 series of mixers has now been hybridized for use in AD245. Powering is provided for 48V Phantom and 12V Tonader microphones.

- Above all others, the most appreciated feature of the original PICO was its simple but effective equalizer. This has been retained in the AD245 - as it has throughout the 140 series of mixers.

- Inputs are protected against radio-frequency interference, and transformer balanced. A high-pass filter protects the transformer against low-frequency saturation. The main, stereo output is transformer balanced and has separate left and right faders. A transformer-balanced, mono mix down of the main output is also available. An electronically-balanced, stereo tape-return appears on a pair of type-A jacks. An input calibration potentiometer is adjacent to the jacks on the connector panel.

- Limiters - which may be linked for stereo operation - have been incorporated in the main output. Taking advantage of the low noise-floor of modern digital recorders, the limiter slope ratio is a gentle 7:1 ; thereby reducing distortion and making artifacts normally associated with limiters much less noticeable or objectionable. Limiting is indicated by a pair of LEDs.

- A pair of meters - either PPMs or VUs - may be switched to monitor either the main output or the monitor/PFL output, and battery voltage. The meters can be illuminated.

- The frequency of the internal oscillator is selectable between 1kHz and 10kHz, its output replacing the signal on the main output (TONE).

- The headphone monitor may be switched between main output and tape-return - both with PFL override. The left, right and left + right signal paths may be routed to both contacts of the monitor-output jack.

- Via an internal microphone the operator is able to communicate with the main output (SLATE) and with an outstation (EXT) - from which talkback is available, under logic control. The outstation normally receives the mixer's mono output.

- All input and output connectors are presented on one surface of the case and in line with their corresponding modules. The connector panel is labeled in order that it may be read from the front of the mixer. The integral carrying handle is also used to support the mixer at a comfortable working angle.

- The mixer receives its power from 8 x C cells fitted internally - the battery housing adding great strength to the casework. Alternatively, power may be supplied from an external 12-15V source. Audio Developments' AD100-09 power supply unit is designed to drive the mixer and, at the same time, charge a set of nickel cadmium batteries - when fitted. The mixer is available in three frame sizes with 6 & 8 inputs.

REFERENCE 0dB=775mV at 1kHz unless otherwise stated.

MAX GAIN MIC 80dB

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

(600R LOAD) MONO TRANSFORMER BAL

+18dBm H'PHONE MONITOR UNBAL

TB SEND UNBAL

OUTPUT IMPEDANCE <60R L-R & MONO

<20R MONITOR

<20R TB SEND

FREQUENCY 0: -1dB L-R & MONO

RESPONSE 0: -1.5dB MONITOR PATHS

HARMONIC <0.05% @ 1kHz @ 0dBm OUTPUT

DISTORTION <0.15% @ 40Hz to 15kHz @ +15dBm OUTPUT

OVERLOAD ILLUMINATES @ +15dBu @ PRE-FADER POINT

INDICATOR

CROSSTALK <-70dB 40Hz to15kHz

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 180mA (6 INPUT)

CONSUMPTION 12V DC SUPPLY

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