© 2003 Altec Lansing Professional y1000 W. Wilshire Blvd., Suite 362 yOklahoma City, Oklahoma 73116
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
