Altec Lansing 4048A SIGNAL PROCESSING User manual

© 2003 Altec Lansing Professional y1000 W. Wilshire Blvd., Suite 362 yOklahoma City, Oklahoma 73116
Phone: [phone] yFax: 1.405.848.3217 yEmail: proin[email protected]
4048A Revision 01
4048A
4 Input / 8 Output Digital Processor
FEATURES – THE ALTEC LANSING DIFFERENCE
•8 Filters per Input, 6 Filters + LP/HP per Output
•Crossover, EQ, All-Pass Filter, Delay and Comp/Limiter
•Link Bus for Output Comp/Limiters
•Matrix-Sum Any Input to Any Output(s)
•Servo-Balanced Outputs
•No Front Panel Controls
•Contact Closure for Recall of 8 Presets
•Five Year Warranty
GENERAL PRODUCT DESCRIPTION
Altec Lansing’s 4048A digital processor is a professional matrix
solution for your permanent audio system install needs. The
4048A features four (4) balanced line-level inputs and eight (8)
balanced line-level outputs. Any input can be routed and
summed to any output or combination of outputs. Mute, gain
and EQ controls are found on all inputs and outputs. High/low
pass filters, delays, polarity invert and compressor/limiters are on
the outputs. Output compressor/limiters can be linked for
smooth concurrent operation.
There are no front panel controls to entice dedicated meddlers.
Set up and Programming the 4048A is only through the Altec
Lansing Maestro software (included). RS-232 serial ports are
located on the front and back to improve ease of field service.
Eight (8) of the eighteen (18) presets can be recalled using a
simple contact closure. All inputs are electronically balanced
and all outputs are active servo-balanced.
All inputs and outputs use a Euroblock connector located on the
back panel. System integrators and consultants will appreciate
these connectors as they allow bare wire to be easily connected
to the 4048A without expensive connectors and soldering.
APPLICATIONS
The Altec Lansing 4048A can be used to drive 4 two-way active
floor monitors from 4 monitor mixes. It can drive a three-way
mono main and 3 floor monitor mixes, or stereo two-way mains
and a mono sub with stereo delays. The 4048A can be a four-
room combining system with extra outputs for recording or media
sends. The versatility of this processor makes it a perfect choice
for audio systems in auditoriums, Houses of Worship, meeting
rooms, and rental applications.
GENERAL SPECIFICATIONS
INPUTS . . . Active Balanced, 18k ohms
Maximum Input Level: +20dBu
OUTPUTS . . . Active Servo Balanced, 112 ohms
Maximum Output Level: +20dBu
INPUT & OUTPUT GAIN: +12/-40dB, 0.1dB increments
FREQUENCY RESPONSE . . . 20Hz – 20kHz, +0.25dB
THD . . . <0.01% @ 1kHz, +20dBu
DYNAMIC RANGE . . . >110dB (20Hz – 20kHz) unweighted
OUTPUT NOISE . . . <-90dBu unweighted
EQ FILTERS: 8 per Input, 6 per Output
Parametric Bandwidth . . .1/64th Octave to 4 Octave
Range . . .+15/-30dB, 0.1dB increments
Resolution . . .1/96th Octave
Low-Shelf Slope . . .Selectable 6 or 12dB/Octave
Freq. Range . . .19.7Hz to 2kHz, 1/96th Octave
Range . . . +15dB, 0.1dB increments
High-Shelf Slope . . . Selectable 6 or 12dB/Octave
Freq. Range . . . 3.886kHz to 20.9kHz, 1/96th Octave
Range . . . +15dB, 0.1dB increments
All-Pass Frequency Range . . .19.7Hz to 21.9kHz, 2nd Order
CROSSOVER FILTERS:
High-Pass Type . . . Linkwitz-Riley, Bessel, Butterworth
Slope . . . 12, 18 and 24dB/Octave
Freq. Range . . . 19.7Hz to 21.9kHz and Off, 1/96th Oct.
Low-Pass Type . . . Linkwitz-Riley, Bessel, Butterworth
Slope . . . 12, 18 and 24dB/Octave
Freq. Range . . . 19.7Hz to 21.9kHz and Off, 1/96th Oct.
OUTPUT DELAY: 682.5ms maximum, 20µs steps
OUTPUT POLARITY: 0 or 180 degrees
COMPRESSOR/LIMITER:
Threshold . . . -20dBu to +20dBu, 1.0dB increments
Ratio . . . 1.2:1, 1.5:1, 2:1, 3:1, 4:1, 6:1,
10:1, 20:1, Infinite:1
Attack . . . 0.5ms to 50ms per dB
Release . . . 10ms to 1 sec per dB
PROCESSOR:
Input A/D and Output A/D . . . 24 bit
Processor . . . 24 bit, 56 bit accumulator
Sample Rate . . . 48kHz
Propagation Delay . . . 1.46ms

© 2003 Altec Lansing Professional y1000 W. Wilshire Blvd., Suite 362 yOklahoma City, Oklahoma 73116
Phone: [phone] yFax: 1.405.848.3217 yEmail: proin[email protected]
4048A Revision 01
OTHER:
Input LED Indicators
Sig . . . green (-20dB), amber (0dB), red (+20dB clip)
Mute . . . red
Output LED Indicators
S/L . . . green (-20dB),
amber (limiter threshold),
red (+20dB clip)
Mute . . . red
RS-232 Cable Distance . . . max. 1300 feet (396m)
Power Requirements . . . 80 – 260VAC, 30W max.
Net Weight . . . 6 lbs (2.7 kg)
Shipping Weight . . . 8.0 lbs (3.6 kg)
Dimensions . . . 19.0”W x 1.75”H x 6.0”D
(48.3cm x 4.4cm x 15.2cm)
Environmental . . . 40 – 120 deg. F, Non-Condensing
(4 – 49C)
* 0dBu = 0.775V rms
As we are continually striving to improve Altec Lansing products,
specifications are subject to change without notice.
Rear Panel View
ARCHITECT’S AND ENGINEER’S SPECIFICATIONS
The digital processor shall have four inputs that can be routed to any
or all eight outputs. Each input shall include mute on/off, gain
adjustment from +12dB to -40dB and 8 filter stages selectable for
high/low shelving, parametric or all-pass type filters. All inputs shall
be electronically balanced with Euroblock connectors. Maximum
input level shall be +20dBu. Input LED indicators on the front panel
shall show signal present, 0dB level, +20dB clip and mute.
Any input or combination of inputs shall be assignable to any output
or combination of outputs.
Each output shall include high/low pass crossover, 6 filter stages
selectable for high/low shelving, parametric or all-pass type filters, a
delay stage (682ms max), gain adjustment from +12dB to -40dB with
ability to phase invert, a full-function compressor/limiter and mute.
All outputs shall be active servo balanced with Euroblock connectors
and maximum output level shall be +20dBu. Output LED indicators
on the front panel shall show signal present, limiter threshold, +20dB
clip and mute.
Frequency response of the 4048A shall be 20Hz to 20kHz, +0.25dB
with dynamic range greater than 110dB (20Hz – 20kHz, unweighted)
and SMPTE IM or THD shall be less than 0.01% at 1kHz, +20dBu.
Complete programming of the 4048A shall be from the front or back
panel accessible RS-232 serial port using Altec Lansing’s Maestro
software. There shall be 18 internal presets that can be overwritten
by the user and stored and presets 1 – 8 shall be capable of external
recall via momentary or latched switch contact.
The digital processor shall be 1 rack space and must be fully
covered with a five year warranty. The dimensions shall be 19
inches (48.3cm) wide by 1.75 inches (4.4cm) high by 6.0 inches
(15.2cm) deep. The unit shall weigh 6.0 pounds (2.7 kg). The digital
processor shall be the Altec Lansing Professional model 4048A.
VISIT WWW.ALTECPRO.COM
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