Altec Lansing 4948A, digital signal processor Specifications, Shelving Filter Boost/Cut Range

Operating Manual-4048A digital signal processor

2.) Use a valid PC serial port. You must use a serial port that is not opened to any other application, such as a mouse, modem, or another program. To verify that the port exists look in: Control Panel - System - Device Manager

-Ports. While you're there, make sure that the port has no warnings or conflicts. There is no need to change the port settings because Maestro Software will do this automatically. Finally, you must select the valid port in software. This is done under the Communications heading - Com Port Assignment.

10. SPECIFICATIONS

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . Active Balanced, 18K

Max. Input Level . . . . . . . . . . . . . . . . . . +20dBu

Input Gain Range . . . . . . . . . . . . . . . . . . -40dB to +12dB

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . Active Balanced, 112Ω

Max. Output Level . . . . . . . . . . . . . . . . . +20dBu

Output Gain Range . . . . . . . . . . . . . . . . -40dB to +12dB

EQ
EQ Filter Types	. . 1st or 2nd Order High or Low Shelf, Parametric, All-pass
Shelving Filter Boost/Cut Range . . .	. . ±15dB
Shelving Filter Frequency Range . . . . Low Shelf 19.7Hz to 2kHz, High Shelf 3.8kHz to 21.9kHz
Parametric Filter Boost/Cut Range	. . +15dB/-30dB
Parametric Filter Frequency Range	. . 19.7Hz to 21.9kHz, 1/96 Octave Steps
Parametric Filter Bandwidth	. . Four Octaves to 1/64 Octave
All-pass phase shift	. . 0 deg at low freq, -180 deg at selected freq, -360 deg at high freq.
Delay
Output Delay	. . 0-682 milliseconds

Crossover

HPF and LPF Frequency Range . . . . . 19.7Hz to 21.9kHz, Off

Available Filter Types . . . . . . . . . . . . . . 12dB/Oct Butterworth, 12dB/Oct Bessel, 12dB/Oct Linkwitz-Riley 18dB/Oct Bessel, 18dB/Oct Linkwitz-Riley=18dB/oct Butterworth 24dB/Oct Butterworth, 24dB/Oct Bessel, 24dB/Oct Linkwitz-Riley

Limiter

Threshold Range . . . . . . . . . . . . . . . . . . . -20dBu to +20 dBu

Ratio Range . . . . . . . . . . . . . . . . . . . . . . . 1.2:1 to INF:1

Attack Time Range . . . . . . . . . . . . . . . . . 0.5ms/dB to 50ms/dB

Release Time Range . . . . . . . . . . . . . . . . 10ms/dB to 1 Second/dB

Frequency Response	20Hz to 20KHz, ±0.25dB
THD	<0.01% @ 1KHz, +20dBu
Dynamic Range	>110dB 20Hz - 20KHz unweighted
Audio Sampling Rate	48KHz
Propagation Delay	1.46mS
Signal LEDs & Clip	Inputs: -20dBu, 0dBu, Clip, Mute
	Outputs: -20dBu, 0, Limit Threshold, Clip, Mute
RS232 Cable Distance	Up to 1300 ft (400m) using high quality cable

AC Requirements . . . . . . . . . . . . . . . . . . Universal Power Supply, 85-265VAC, 50/60Hz, 30W max Environmental . . . . . . . . . . . . . . . . . . . . . 40°F - 120°F (4°C-49°C) Non-condensing

4048A Weight . . . . . . . . . . . . . . . . . . . . . 8 lbs (3.6kg) shipping, 6 lbs (2.7kg) net

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