DACS MicAmp2 User Manual

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TWO CHANNEL MICROPHONE PREAMPLIFER

icAmp2

USER GUIDE

icAmp2

Instructions for use and installation

Welcome

At DACS we are very pleased that you have chosen to purchase one of our products. We take pride in our work and are sure that this MicAmp2 will give you years of exemplary service. If you have any suggestions or comments about this product please call, fax, write or e-mail us with your thoughts. Thank you.

Introduction

The MicAmp2 is an ultra low noise microphone amplifier. It uses three super matched pairs of transistors for the main gain stage, giving low noise performance and very fine detail, even at very low input levels. The frequency response is flat down to below 1Hz at the bottom (DC for non phantom powered microphones) and does not start its tailored high frequency roll-off until above 45kHz. The CMRR is hand trimmed at mid and high frequencies to very high tolerances.

Each channel has an eight position self cleaning rotary switch to set gain in 6dB steps from 20dB to 62dBd. There is then a gain trim from 0dB to +10dB, and a three position bass roll off filter, giving a flat response and two cut-off points at a nominal 80Hz and 30Hz. The cut-off point and slope of the filters have been chosen to give a smooth response, while removing very low rumble (30Hz) and more mains type noise (80Hz). In addition they have no effect above their cut-off frequency. The balanced output is a fully floating servo type output, with hand trimmed balance set to +/-1% accuracy, delivering up to +22dB into 600R.

Working with the MicAmp2 is straightforward. Settings are easily repeatable due to the stepped gain and detailed scaling on the trim control. There is ultra fast protection on the input so that any fault condition immediately triggers the protection circuitry, preventing damage to the amplifier circuitry.

DACS LTD, Stoneh ills, S hields Road, P ELAW, Gateshe ad, Tyne and Wea r NE10 0HW Tel: +44 (0) 191 4382500 | Fax: +44 (0) 191 4382511 | www.dacs-audio.com | sales@dacs-audio.com

3. (Non Phantom) Input

for Microphones that do

not require power, eg.

valve mics, dynamic mics

4. (Phantom) Input with

48V phantom power on

pins 2 and 3

2. Electronically balanced

output for unbalanced

operation connect either

pin 2 or 3 to 0V

from mains earth

6. Stepped gain in 6dB steps from 20dB to

62dB

7. Gain Trim allowing extra gain of 10dB scale

to the hour and half hour for easy repeatability

(6 o’clock = 0dB. 3 o’clock= +10dB)

8.Bass roll off filter - flat and 30Hz or 80Hz the

filter curve has been selected to minimise the

effect of frequencies above cut off point

9. Unique tri segment LED meter - PPM ballistics variable

intensity LED illumination - Green illuminates at -15dBM,

Yellow at +5dBm and Red at +13 dBm

10. Ultra bright overload light illuminates when clipping

occurs (overload ca +22dBm) and remains on for a few

seconds

11. Phase reverse switch, Up for in phase, down to reverse

5. Audio 0V, isolated

12. Power Switch

6 7 8

1. IEC inlet factory set to 240V. For

110V supply, remove fuse holder

and rotate so that 110V legend is

on top/correct way up

DACS LTD, Stoneh ills, S hields Road, P ELAW, Gateshe ad, Tyne and Wea r NE10 0HW Tel: +44 (0) 191 4382500 | Fax: +44 (0) 191 4382511 | www.dacs-audio.com | sales@dacs-audio.com

+ 5 hidden pages

DACS MicAmp2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual