Altec 8751a manual

Page 1

ALTEC

8751A

Programmable Microaudio

14 Band Equalizer Module

KEY FEATURES

* Convenient Plug-in Module
* Wide Dynamic Range

* Unique Filter Arrangement
* Selectable Boost/Cut Steps

PRIMARY SPECIFICATIONS

Type:
Number of Bands:

Programmable Features:
Boost/Cut of each band:

Input circuitry,

Type:

Impedance:

Nominal Level:

Maximum Level:
Output circuitry:

Type:

Source Impedance:

Nominal Level:

Maximum Level:

Frequency Response:

Dynamic Range:

DESCRIPTION

The 8751A is a fourteen band programmable
MicroAudio equalizer module. The module plugs
directly into a main-frame l/O port of an Altec Lansing
1700C mixer/preamp; 1707C mixer/power amplifier
or 1715C mixer/power amplifier. Two male RCA
terminated leads extending from the rear connector
panel allow the equalizer to be connected in the
audio path between the pre-amp output and input of
the power amplifier being used. The equalizer
control is accessed only through a data port This
makes the equalizer tamper~proof. For more selectiv-
ity in equalization control, the 8751A utilizes a vari-
able, high Q filter circuit in each of the I4 bands.

Active analog filter set

14 bands located on ISO
center frequencies from 80
Hz to 6.3 kHz.

112 dB in 1 dB steps
:6 dB in '/2 dB steps

Unbalanced

15 kit

0 dBu (0.775 V rms)
+18 dBu

Unbalanced

100.

O dBu (0.775 V rms)

+18 dBm (+24 dBu into 2
k0 or greater load)

20 Hz - 20 kHz,

+0 dB,

> 105 dB (peak signal to
A-weighted background
noise)

The internal microprocessor controls the amount
of boost or cut for the 14 bands in 1 dB steps over a

t 12 dB range. The equalizer module has a unique
filter band arrangement. One-third octave filters are
used for tuning of mid-band frequencies. The low
frequencies and high frequencies are adjusted using
one octave filters. The unique variable Q filter design
arrangement and tamper-proof control provide an
equalization function that enhances a I700 series
design vvithoul taking valuable rack space.

SYSTEM REQUIREMENTS

AnyAltec [arising 1700C series mainframes will accommodate
the 8751A. To program the 8751A one of the various Altec
Lansing programmers is needed. The programmers are the
Altec [arising 8055B Hand-Held Programmer, the 8061A PC
Controller Card, and the 8063A RS-232 Converter, each

available iron Altec Lansing. The model I700C Mixer/Pre-Amp
does not have a power amp section. If the equalizer module
is used in this model, the equalizer will be used as an output
to drive another power amplifier unit only.