AKG Acoustics AS 4+3 User Manual

AS 4+3

Automixer

Description

The AS 4+3 is an easy to use and affordable gating
automixer that can easily be integrated into any sound
reinforcement, teleconferencing or recording application. The
AS 4+3 has four balanced mic inputs and three unbalanced
line inputs, as well as, one balanced line output and one
unbalanced record/line output.

Each of the four mic inputs have integrated and adjustable
compressor/levelers making the AS 4+3 an automatic level
control system. The compressor/levelers can help maintain
consistent audio level despite various signal strengths that
may be present at the microphone inputs. NOM attenuation
decreases by 3dB every time the number of in-use mics
doubles. A switcheable ducking function will attenuate all
other inputs by 12dB when signal is present at mic input #1.
Dipswitches on the rear panel allow for the line inputs to be
exempted from the automix and/or ducking functions in the
mixer.

The AS 4+3 was designed to operate with various types of
microphones. Dip switches on the rear panel allow for
24 volt phantom powering of condenser microphones. The
preamp gain range for the mic input signal are switcheable
on the rear panel while front panel controls provide fine
adjustment of input and output signals for an exact match
into whatever component follows the AS 4+3.

More than one AS 4+3 may be daisy chained via
expansion port connection incorporating the automix
functions so that all will work together as one unit.

Features

• Four automatic microphone inputs,
three line inputs

• Integrated compressor/leveler for
consistent levels

• Ducking/priority function

• Expansion ports for larger systems

• Low and high frequency shelving
controls on master line output

• Balanced line output and
unbalanced record output

Microphones · Headphones · Wireless Microphones · Wireless Headphones · Headsets · Electroacoustical Components

Limited Warranty

Valid only in the United States. AKG Acoustics warrants AKG products against defects in material
or workmanship for a period of two years from the date of original purchase for use, and agrees to
repair or, at our option, replace any defective unit without charge for either parts or labor. Important:
This warranty does not cover damage resulting from accident, misuse or abuse, lack of reasonable
care, the affixing of any attachment not provided with the product, loss of parts or connecting the
product to any but the specified receptacles. This warranty is void unless service or repairs are
performed by an authorized service center. No responsibility is assumed for any special, incidental

or consequential damages. However, the limitation of any right or remedy shall not be effective
where such is prohibited or restricted by law. Simply take or ship your AKG product prepaid to our
service department. Be sure to include your sales slip as proof of purchase date. (We will not repair
transit damage under the no-charge terms of this warranty.) Note: No other warranty, written or oral
is authorized by AKG Acoustics, Inc. This warranty gives you specific legal rights, and you may also
have other rights which vary from state to state. Some states do not allow the exclusion or
limitation of incidental or consequential damages or limitation on how long an implied warranty
lasts, so the above exclusions and limitation may not apply to you.

Specifications subject to change without notice.

AKG Acoustics GmbH

Lemböckgasse 21–25, P.O.B. 158, A-1230
Vienna/AUSTRIA
Tel: [phone]*, Fax: [phone]
Internet: http://www.akg.com

AKG Acoustics; A Division of Harman Pro Germany
Bodenseestraße 228, D-81243 München/GERMANY
Tel: [phone], Fax: [phone]

Arbiter Pro Audio

Wilberforce Road, London NW9 6AX/ENGLAND
Tel: [phone], Fax: [phone]

AKG ACOUSTICS, U.S.

914 Airpark Center Drive
Nashville, TN 37217, U.S.A.
Tel: [phone], Fax: [phone]

Studer Japan Ltd.

2-43-7, Uehara, Shibuya-ku, Tokyo 151-0064/JAPAN
Tel: [phone], Fax: [phone]

Erikson Pro Audio

620 McCaffrey, St-Laurent, Quebec, H4T 1N1, CANADA
Tel: [phone], Fax: [phone]
Internet: www.jam-ind.com/eriksonpro

DS-AS 4+3

The mixer shall be an automatic mixer capable of being daisy­chained, with four gated microphone inputs and three line inputs.
The microphone inputs shall provide 24-V phantom power and a
compressor limiter separately adjustable for each channel. The
device shall be fitted with microphone inputs and a line output on
3-pin XLR connectors and line inputs and recording outputs on

RCA jacks. A switchable ducking function shall cause all other
channels to be attenuated while there is activity in the MIC 1
channel. The mixer shall be fitted with a two-band equalizer (bass
and treble) affecting only the main output signal. The automatic
mixer shall be the AKG Acoustics Model AS 4+3.

Architects and Engineers Specifications

Specifications

Microphone Inputs

Type: balanced and RF filtered

Impedance: approx. 2.4 kΩ at any level

Nominal level: -50 to -10 dBu adjustable

in two sub-ranges

S/N ratio: 75 dB (20 Hz to 22 kHz, rms)

Max. input level: +5 dBu

Turn-on threshold: -32 to 0 dB re nominal input level

Hold time: 1/4/8/12 secs. ±20%

Gate attenuation: 14 to 26 dB, adjustable

Compression ratio: linear to 2:1, adjustable

Audio bandwidth: 20 Hz to 35 kHz

NOM attenuation: 1 microphone: 0 dB

2 microphones: -2.1 dB
3 microphones: -4 dB
4 microphones: -5.5 dB
5 microphones: -7.2 dB
6 microphones: -8.6 dB
7 microphones: -9.9 dB
8 microphones: -11 dB

Phantom power: 24 V, switchable on each channel

(Ri = 2 x 1.2 kΩ)

Line Inputs

Type: unbalanced and RF filtered

Impedance: >35 kΩ

Nominal level: -10 dBu

S/N ratio: 75 dB (20 Hz to 22 kHz, rms)

Audio bandwidth: 20 Hz to 45 kHz

Max. input level: +5 dBu

System:

Max. gain: 55 dB (input to main output)

Ducking attenuation: 9 dB to 20 dB, adjustable

THD: <0.1%; at any level setting

IM distortion: <0.1%; at any level setting

Power requirement: 5 W max. at 12 V AC

Weight: 5.5 lbs. (2.5 kg )

Size: 19 x 1.7 x 7 in. (483 x 44 x 180 mm)