Altec 1905a manual
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Page 1
ALTEC
1 905A
Variable Bandwidth
5 Band Parametric Equalizer
KEY FEATURES
*7 Five bands of equalization with
variable frequency range
* Variable bandwidth
* Variable low-pass and
high-pass filters
(20 Hz - 20 kHz, unweighted):
KEY SYSTEM SPECIFICATIONS
Frequency Ranges:
Coarse: 17 Hz - 130 Hz
170 Hz - 1.3 kHz
1.7 kHz - 13 kHz
Fine: 16.5 Hz - 205 Hz
165 Hz - 2.05 th
1.65 kHz - 20.56 kHz
Maximum Boost/Cut: +15/-25 dB
Bandwidth: Variable from
1/12 - 2 octaves
2.5 kHz - 30 kHz,
12 dB/octave
Low-Pass Filter:
High-Pass Filter: 15 Hz - 300 Hz,
12 dB/octave
Frequency Response: 20 Hz - 20 kHz, 11.5 dB
Distortion (@ +4 dBm): < 0.01 96 @ 1 kHz
Equivalent Input Noise
< -90 dBm
DESCRIPTION
The Altec Lansing 1905A is a boost and cut five
band Parametric Equalizerwhose primary use is for
tuning the overall frequency response of a sound
reinforcement system, both to increase gain-before-
feedback and to compensate for the deficiencies in
the acoustic environment and the sound system.
The ability to control both the bandwidth and
center frequency of a bank of filters as well as the
degree of boost or cut opens up a new dimension
in equalization allowing filter correction and cre-
ative filtenng capabilities of unparalleled accuracy
and precision.
Each of the five parametric filters allows a
range from +15 dB of boost to -25 dB of cut at vari-
able frequencies per band.
A high-pass filter control, with a variable comer
frequency range of 15 Hz - 300 Hz and 12 dB per
octave slope, is located on the front panel along
with a low-pass filter control, with a variable comer
frequency range of 2.5 kHz - 30 kHz and 12 dB per
octave slope. A master level control allows the
signal to be boosted up to 6 dB or cut to -oo. A
master EQ-lN switch allows the user to remove the
equalizer from the signal path.
The 1905A can be used as a stand alone
parametric equalizer, or can be utilized in con-
junction vvith the TEF 20 and AcoustaEQ software.
This allows a higher degree of accuracy in the
equalization process.