Altec 8553b manual

Page 1

ALTEC LANSINGa

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IT L-CONTRO

85538 DUAL ONE-THIRD
OCTAVE PROGRAMMABLE
MICROAUDIO EQUALIZER

DESCRIPTION

The ALTEC LANSING model 85533 is a dual chan-
nel programmable onethird octave equalizer. Since
the two channels are fully and independently pro-
grammable, there are no front panel controls to
adjust. This makes the unit completely tamperproof
and compact enough to fit into a single rack-space
package.

Each channel has 28 programmable one-third octave
frequency bands, programmable high and low pass
filters, programmable master gain, and nine non-vol-
atile memories providing one default and eight user
preset memories. The gain of each frequency band
and the master gain are programmable in precise 1
dB steps from -12 dB to +12 dB but can be easily
modified by the user to provide :6 dB of boost and
cut in 0.5 dB steps. High filter Qs provide improved
selectivity resulting in less interaction between
adjacent bands. The unit has electronically-balanced
inpuB and outputs with room inside to mount
optional input and output isolation transformers.

The unit also features System422TM Digital Control
via the PA-422 communications interface, a new
serial interface definition for the control of
professional audio products. This makes the 85533

' completely compatible with all other programmable

products using the interface.

The PA-422 interface permits high speed com~
munications between the programmer and each

8553B equalizer, and up to 250 equalizers can be
series-connected to any single PA»422 output port.

The equalizer is fully programmable from most IBM
PC-compatible desktop and laptop computers using
Acousta»Graphics Release 2.0 System Management
SoftwareTM and the 8062A PA-422 Dual Output
Driver Card or the 8060A RS-232-to-PA-422 con-
verter. The 8062A is an IBM PC XT/AT-compatible
plug-in accessory card with two PA~422 outputs. The
two ports permit independent control of up to 500
programmable devices. The 8060A is an R5-
232-to-PA-422 serial output converter. Although
usable with any PC-type computer, it is especially
useful with laptops which may not physically
accommodate the 8062A accessory card. With
System422m, the equalizer can also be programmed
using user-written custom software developed for
specific installations. This permits increased flexibility
in system designs where special needs are in order.

With its standard uA-bus port, the 85533 is also
programmable from the 8061A PC Control Adapter,
8051A Autoprogrammer, or the 80558 handheld
programmer to the degree of the controllers

capability.

The ALTEC LANSING 8553B Dual Channel Program-
mable MicroAudio Equalizer provides unmatched
power, performance, and flexibility to accommodate
present and future system needs.

Page 2

SPEClFICATIONS FOR THE 8553B DUAL CHANNEL PROGRAMMABLE MICROAUDIO EQUALIZER

Channels:

Filter Type:

Number of Bands:

Two, completely inde-
pendent

Active analog 2nd-order
bandpass filter set

28 one-third octave
bandpass filters on ISO
center frequencies from
31.5 Hz to 16kHz.

[LA-bus Programmability:
(using 8061A, 8051A, or 80558 programmers)
B/C of each frequency

band:

Master gain:

Channel selection:

uA-bus Interface Port:

Type:
Max. Cable Length:

:12 dB in 1 dB steps
(standard configuration)

: 6 dB in 1/2 dB steps
(with user hardware modi-
fication)

:12 dB in 1 dB steps
(standard configuration)

5 6 dB in /2 dB steps
(with user hardware mod-
ification)

rear panel toggle switch

Non-standard TH
15 m (50 ft.)

System422m Programmability:
(using 8060A or 8062A PA-422 drivers and
Acousta~Graphics Release 2.0 System Management

Software)

B/C of each frequency

band:

Master gain:

Low pass filter

corner frequency:

High pass filter
corner frequency:

Memories:

:12 dB in 1 dB steps
(standard configuration)

1 6 dB in 1/2 dB steps
(with user hardware mod-
ification)

:12 dB in 1 dB steps
(standard configuration)

: 6 dB in 1/2 dB steps
(with user hardware mod-
ification)

5 kHz, 6.3 kHz, 8 kHz,
10 kHz, 12.5 kHz, 16
kHz, & OFF (>50 kHz)

OFF (<10 Hz), 40 Hz, 50
Hz, 63 Hz, 80 Hz, 100
Hz, 125 Hz, 8: 160 Hz
Default (DEF), 1, 2, 3, 4,
5, 6, 7, & a

Memory pointer:

Channel selection:
Device Address:

PA-422 Interface Port:
Type:
Baud rate:
Max. cable length:
Linking:
Character frame
bits:

Handshaking:

Input Circuitry:
Type:

impedance:

Nominal Level:
Maximum Level:

Output Circuitry:
Type:

Source impedance:

Load Impedance:
Nomimal Level:
Maximum Level:

High Pass Filter:

Low Pass Filter:

Frequency Response:

Total Harmonic
Distortion:

IMD (SMPTE 4:1):

Noise Floor:

OFF, 1, 2, 3, 4, 5, 6, 7,
& 8
1, 2
via 8-position DIP switch

Electronically»balanced,
meets EIA-422~A

19.2 kilobaud

1.2 kilometers (4,000 ft.)
Serial

1 - start bit

8 - data bits

1 - even parity bit
2 ~ stop bits
DSR/DTR

Electronically-balanced,
transformer option

20 kn balanced

15 kn unbalanced

0 dBu (0.775 V rms)
+18 dBu

Electronically-balanced,
transformer option

20 n balanced

10 fl unbalanced

600 0's minimum

0 dBu (0.775 V rms)

18 dBm

+24 dBu into 2 K0 mini-
mum load impedance

3-pole (18 dB/octave),
programmable frequency

3pole (18 dB/octave),
programmable frequency

20 HZ - 20 kHz, 11/2 dB
(with high and low pass
filters OFF)

<0.015% (at unity gain
from 20 Hz - 20 kHz)
<0.015% (at unity gain)
<-85 dBm (A-weighted,

at unity gain, high and
low pass filters OFF)