Loudspeaker Acoustical Room Analyzer (LARA) V2.2
Version 2.2 now available!
Direct sound SPL for upper
level of a stadium
LARA can be used to predict the
direct field coverage of one or more loudspeakers over a defined listening
area. In the basic package the listening area is defined by selecting from a
library of room shapes and entering the key dimensions.
Louspeaker coverage data can be
read from EASE 2 or 3 format data files. The cabinet geometry is added
to the imported data and all data is stored in a native cabinet library.
Major features include:
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Definition of rooms using a library of pre-defined shapes. You just supply the key dimensions. |
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Definition of rooms with arbitrary geometry (with optional full geometry module). |
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Mouse driven display pan, zoom and rotate. |
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Use of EASE 2 or EASE 3.0 format data for loudspeaker coverage, this data is available from many loudspeaker manufacturers (EASE 3.0 data must be translated user the free software, PolarView, included with LARA). |
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Calculation at third octave frequencies |
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Choice of power summation or complex addition to calculate coverage and response |
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Display of contours showing SPL or geometric data (e.g. distance from loudspeaker) on individual surfaces or groups of surfaces. |
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Line of sight acoustic shadowing calculations show regions that have no line of sight to loudspeakers. |
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Choice of results display modes, trading off speed of calculation for resolution. Spot mode gives virtually instantaneous coverage display. |
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Display of signal arrival time and levels for individual loudspeakers (Direct ETC) at a discrete point. Directly shows the affect of adding delays to loudspeakers. |
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Display of computed frequency response at discrete points. Display has separate controls for display and calculation resolution with smoothing. |
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Loudspeakers can be configured in clusters which can then be added to the room and oriented as a single unit. |
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Loudspeakers arranged in regular patterns can be quickly configured as clusters using array definitions. |
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Probe reports computed values at a location simply by clicking on it. |
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Generates report showing average power requirements, peak power requirements and mass for each loudspeaker and cluster and for the whole system. Loudspeaker headroom is also reported. |
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An Ear Height correction can be entered. Results can be displayed on a surface or at ear level. |
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Export of room geometry to CATT-Acoustic |
The room can be
viewed in 3-D wireframe and a probe can be used to determine the SPL, distance
from loudspeaker and loudspeaker angles for a selected point.
Loudspeakers can be assembled
into clusters and then placed and oriented together.
When system design is complete an
HTML report can be generated that documents the design, including loudspeaker
power requirements.
Results calculated include:
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SPL over surfaces, calculated by power or complex summation. |
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Signal arrival time and level from every loudspeaker. |
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Direct frequency response at any audience location. |
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Loudspeaker headroom, input power required and total weight. |
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Geometric data such a distance and angle from selected loudspeaker. |
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Room volume. |
Price for basic package $250 Canadian.
Key
Benefits
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Improved loudspeaker selection and placement. |
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Predict interaction between multiple loudspeakers. |
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Extensive library of loudspeaker data available |
A few more forms
are shown below.
This is the main form. The blue
buttons control room view direction. Green buttons access loudspeaker data and
Red buttons are used to calculate results.
This form is also used to set the
units you work in and menus provide access to the remaining features.
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The Display
Options form is used to select the type of data to be displayed, the loudspeakers
that should be used in the calculations and how that data will be displayed. Coverage data can be displayed
in three ways:
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The probe form shows results calculated at a point selected on the screen. |
