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SPECIFICATIONS
Type:
Scan
Frequency Response:
ower Output:
Distortion:
Noise Level:
Source Impedance:
Load Impedance:
Maximum Compression:
Atteck Time:
Release Time:
OR
OR
OR
Threshold:
Compression ratio:
Controls:
Power Syoply:
Dimensions:
Color:
Weight:
| ALTEL
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OPERATING
INSTRUCTIONS
abot
to 47
Figure 1. 9473A Limiter Amplifier
Limiter Amplifier
50 dB
=1 dB 20~ 20,000 Hz
+24 dBm maximum output level
Less than
1% at 20 dB compression
32 Hz to 20 KHz (Typical 0.5%)
74 dB below rated oviput
150 ©: 600 ohms
150 or 690 ohms
40 dB
10 ps
C.4 sec. above
250 Hz, 3.6sec.
below 250 Hz
C.4 sec. Single Band
3.6 sec. Single Band
Dia. Releose as 9 function of con-
trolling freauency
+15 dbmwith output level contro! ot
maximum
Selectable 4:3, 12:1, or 20:1
INPUT Level
Corirol, 20 step at-
tenvater 2 dB/step
OUTPUT Level Controf, 20 steo at-
terivator 2 d8/ step
Dual Band Dual Release
Single Band Dual Release
Single Band 0.4 sec. Release
Single Bond 3.6 sec. Release
Compression Ratio interlocked 20:1,
12:1, 4:1
POWER
SWITCH
120/240V o- 50/60 Hz at 15 watts
5-1/4" Hx 19" Wx 7-3/16" D
ALTEC Greer.
14 pounds
1515 S. Manchester Ave., Anaheim, Calif. $2803
DESCRIPTION
The ALTEC 9473A Limiter Amplitier, designed primarily for re-
cording studios, cherocterizes the concapt of spectral sepera-
tion, through the technique of a> Internal crossover network.
The classical problems of envelope distortion cavied by 120
short a release timeand lossaf program followings nign energy
peak when release t'me is too long ore eliminated.
A soiid-
state,
100% silicon transistor amplifier, the ALTEC 9473A,
separates the incoming progrom materia! into two bands, eect
band controlled by o separcie limite: circuit.
The distortior
floure, allowable ot the lowest frequency of the' bend deter
mines the release time, from 250 Hz up at 0.4 seconds, are
below 250 Hz at 3.6 seconds.
The ALTEC 94724 Limiter Am-=
plifier utilizes 'wo 'ront panel meters to indicate dB of com-
pression within the respective frequency spectrum,
The usa of
an insulated gare Field Effect Transistor, provides instantaneous
attack with no thump or oversmoot.
The Qual Band Dual Release
position operates on each tana
separateiy, compression in one band no: aifecting the other.
The Single Band Dual Release position contral volteges ore
sleved
together,
with the largest signa! cantroiling both sides.
In this mode, the ALTEC 94734 is a standard wideband com-
pressor with the added advantage of allowing the release time
to vary fron: 0.4 seconds to 3.6 seconds, as a function of the
frequency of the largest signal presen}.
Forexample,
high
frequency passages may be severely compressed by peaks with
a rapid release thus eliminating prolonged toss of audio, wile
low Frequency passages are released slowly te eliminate envelope
distortion.
Specifications
and
componente
subject
to change
without
notice. Overal! yerfearmance will be maintained er improved.
42-02-04 1697~02 Price 56.21
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