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4048A
digital signal processor
Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Professional ofessional ofessional ofessional ofessional
1000 W. Wilshire Blvd. Suite 362
Oklahoma City, OK 73116 USA
A division of Altec Lansing Technologies Inc, Milford PA 18337-0277 Made In USA
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Operating Manual -4048A digital signal processor Table Of Contents 1 1 1 1 1 INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 2 UNP UNPACKING ACKING 2 2 2 UNP UNP UNPACKING ACKING ACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 3 3 3 3 AC POWER REQUIREMENTS AC POWER REQUIREMENTS AC AC POWER REQUIREMENTS A
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Operating Manual-4048A digital signal processor The lightning flash with arrowhead The exclamation point within an symbol, within an equilateral tri- eqilateral triangle is intended to angle, is intended to alert the user alert the user to the presence of
to the presence of uninsulated important operating and mainte- "dangerous voltage" within the nance instructions in the literature TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE product's enclo
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Operating Manual -4048A digital signal processor 1. INTRODUCTION Your new 4048A is a flexible four input/eight output digital signal processor capable of precise control of a broad range of audio functions. Because it has no user controls, it is ideal for applications where real-time changes are unlikely or when tamper-proof security is required. All adjustments are made using Altec Lansing Maestro™ soft- ware for Windows™. The 4048A utilizes state of the art DSP technologies, beginning wit
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Operating Manual-4048A digital signal processor 4. FRONT PANEL FEATURES 4.1 Input Channels The 4048A has four input channels, each of which can be routed to any combination of output channels. Each input channel's three color Sig LED indicates input signal level of -20dB (green), 0dB (amber), and +20dB clip (red) respectively. Note that the Sig LEDs detect actual signal at the input connections, before any gain adjustments are made within the 4048A. The red input mute LED becomes lit when
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Operating Manual -4048A digital signal processor 5. REAR PANEL FEATURES 5.1 Input Connections Balanced input signals are connected to the 4048A using the included "Euro Block" connector. A flat blade screwdriver is required to connect a stripped wire lead to the loose connector, which is then inserted into the rear panel Euroblock receptacle. It is important that both (+) and (-) inputs are properly terminated or signal loss and noise may result. In other words, if an
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Operating Manual-4048A digital signal processor 5.3 Contact Closure Connector There are no user controls on the 4048A, making it ideal for permanent installations where security is an issue. There may be times, however, where audio system adjustments must be made in response to real time acoustic changes, such as room size. For these types of changes, the 4048A offers the ability to recall up to eight different presets using contact closures. Contact closures are nothing more than external,
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Operating Manual -4048A digital signal processor 6. ALTEC LANSING MAESTRO™ SOFTWARE Altec Lansing offers a powerful software interface for the Windows PC environment, providing control for the 4048A digital signal processor. All controls are intuitively represented in a user friendly way, and on-line help is available for key functions. 6.1 Installing Software The Maestro™ installation program is the same whether from the web site or from a disk. To install the software, double-click on
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Operating Manual-4048A digital signal processor 7. GETTING STARTED 7.1 Configuration Options Altec Lansing Maestro Software for the 4048A includes 10 permanent default configurations which can be used as starting points for setting up user defined presets. Modified configurations can then be saved to either disk (filename.alp) or one of 18 memory locations on the 4048A. Load a default setup by clicking within the menu. The default configuration options are: 1. 4 x 2
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Operating Manual -4048A digital signal processor 7.3 Audio Functions Editing of audio controls is done through the use of scroll bars, numerical entry, various keyboard shortcuts, or by visually dragging filter points in the frequency response window. Ease of use, especially in the frequency response window, makes it possible for fast, potentially destructive mistakes, so plan carefully before making radical gain or filter changes. 7.3a Keyboard/Mouse Shortcuts Convenient shortcuts allow for qu
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Operating Manual-4048A digital signal processor 7.3d EQ Each input and output of the Altec Lansing 4048A processor has its own EQ section offering full parametric EQ, four types of shelving filters, and an all-pass filter. Input channels have eight selectable EQ filters, while output chan- nels have six selectable EQ filters. On all inputs and outputs, each EQ filter is selectable between parametric (PEQ), 1st order Low Shelf (LS1), 2nd order Low Shelf (LS2), 1st order High Shelf (HS1), 2nd o
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Operating Manual -4048A digital signal processor Shelving EQ filters: 1st order filters use a gentle 6dB per octave slope, while 2nd order filters use a 12dB per octave slope for more a pronounced boost or cut. All shelving filters have a boost/cut range of +/-15dB. Low shelving filters have a frequency range from 19.7Hz through 2kHz, and the high shelving filters range from 3.886kHz through 21.9kHz. Shelving filters are most useful as .
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broad tone controls to boost or cut the
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Operating Manual-4048A digital signal processor Butterworth Butterworth filters individually are always -3dB at the displayed crossover frequency and are used because they have a "maximally flat" passband and sharpest transition to the stopband. When a Butterworth HPF and LPF of the same crossover frequency are summed, the combined response is always +3dB. With 12dB per octave Butterworth crossover filters, one of the outputs must be inverted or else the combined response will result in a larg
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Operating Manual -4048A digital signal processor 7.3g Delay + % 4
1 In large installations or outdoor venues there are often many speakers in vari- ous locations to get the best coverage possible. Since sound travels relatively slow through air (1130 ft/s at 20ºC), multiple loudspeaker locations can create a situation 1 where the original audio signal, simultaneously leaving all loudspeakers, arrives at a 3
% single point in the venue at several diff
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Operating Manual-4048A digital signal processor Attack and Release settings adjust the time it takes the limiter to engage and then disengage when the signal increases above threshold and then subsequently falls back below threshold. Attack time is adjustable from 0.5ms/dB through 50ms/dB, while release time ranges from 10ms/dB through 1s/dB. A very fast attack time can sound unnatu- ral, while a very long attack time can miss some of the initial transient. Similarly, a very short release tim
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Operating Manual -4048A digital signal processor the remaining seven monitors, providing a consistent starting point for each mix. To copy, first select the input or output to copy from, then click , then click on the input or output to copy to, clicking to complete the action. 8.4 Security There are two levels of protection assignable to the 4048A within the software pull down menu. The first level allows the user to edit any setting
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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 po
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Operating Manual -4048A digital signal processor 11. DIMENSIONS ./2:9 # /:' ./: 9 # '
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Operating Manual-4048A digital signal processor Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Professional ofessional ofessional ofessional ofessional 1000 W. Wilshire Blvd. Suite 362 Oklahoma City, OK 73116 USA A division of Altec Lansing Technologies Inc, Milford PA 18337-0277 Made In USA Printed in USA 4048A-0 0503
