Design and Manufacturers of Professional Sound Mixers

This mixer from Audio Developments has been designed for a variety of applications. However, its small size (13.5x9.5x4.0cm) and low weight (400gm), lends itself to being mounted on a camera or attached to a belt. It has 3 inputs and two outputs with limiters

on microphone inputs and the main outputs. There are two configurations; a one microphone plus two line inputs or

three microphone inputs. It is capable of being set and

left to process the audio.

MIC INPUTS – One or three electronically balanced type with XLR connector, 48V phantom power, high-pass filter, gain control and mic or line input selection.

LINE INPUT – Instrumentation grade electronically balanced with gain/level control.

ROUTING – Each input is routed to left, right or left and right by two toggle switches.

OUTPUTS – Electronically balanced with XLR type connectors and stereo rotary level control.

Can be unbalanced without loss of level or degradation of quality. A push-button switch selects line or microphone output levels to the XLR connectors. A 3.5mm jack socket carries output signals at microphone level.

LIMITERS – Incorporated in the microphone inputs and the two main outputs. The microphone input limiter is permanently in circuit. A push-button switch introduces the output limiters into circuit and two LEDs indicate the onset of limiting.

LINE-UP OSCILLATOR – 1kHz tone injected into outputs.

MONITORING – Headphone output on 3.5mm jack socket with a push-button switch selecting the direct or return signals. The return signals are brought in on a 3.5mm stereo jack.

METERING – Two LED ladders indicate output level

POWERING – Either external power, via a

4 pin Hirose connector, or a separate PP3

9V battery pack can be used to power the

mixer. An LED indicates power present

and flashes when the voltage is too low.

MAX GAIN

Mic 68dB

Line 10dB

MAX INPUT LEVEL

Mic at Max Gain -40dBu @ Min Gain +3dBu

Line at Max Gain +15dBu @ Min Gain +20dBu

Stereo-Return +8dBu

INPUT IMPEDANCE

Mic >2kR

Line >100kR

Stereo-Return >10KR

MIC POWER 48V Phantom

OUTPUTS

XLR - Line Level 0dBu Ref, Mic -40dBu Ref

3.5mm Jack -30dBu Ref

MAX OUTPUT

+17dBm (600R Load) L-R Balanced

+17dBm (600R Load) Headphone Mon. Unbal

OUTPUT IMPEDANCE

<100R L-R

<20R Monitor

FREQUENCY RESPONSE

-1.5dB Main Outputs (20Hz - 20kHz)

0 -1.5dB Mon. (20Hz - 20kHz)

TOTAL HARMONIC DISTORTION

<0.05% @ 1kHz @ 0dBu Output

<0.2% 40Hz-15kHz @ +15dBm Output

CROSSTALK

<-70dB 40Hz to 15kHz Inter-Channel & Inter-Group

NOISE

Mic <-125dB EIN 20Hz-20kHz: 200R Source

Line <80dB SNR 20Hz-20kHz: 0dBu In & Out

HPF (Mic/Line Module Only)

-3dB @ 110Hz, 12dB/Octave

OUTPUT LIMITER

Threshold +8dB

Ratio 15:1

Attack 4mS Release 40mS

TONE 1kHz, 0dB Output

METER

2 x 6 Segment Displays, 4dB/Segment

POWERING

External:- 9 -15V on 4 pin Connector

Internal:- PP3 Battery

CURRENT CONSUMPTION

120mA

DIMENSIONS

135mm x 95mm x 44mm

WEIGHT

400g

The mixer is designed to fix a Giottos MH 621 or 631 camera mount enabling the camera to be easily removed from the mixer.

A light weight aluminium plat fixed to the under side of the mixer has a standard ¼ thread for mounting on a tripod