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Seagrave Instruments - A New Tool for Room Mode Visualization

The LASSIE System (Large Array of Sound Sensors Indicating Excitation)

A new and powerful way to visualize Room Modes, the patented LASSIE System enables direct viewing of sound pressure levels throughout the listening area. While the user performs a standard 20 to 200 Hz sine tone sweep through the sound system, the array of sound sensors displays SPL by variable brightness LEDs at 49 locations simultaneously! Using the supplied webcam and a laptop PC, the system can image room modes at frequencies throughout a listening space, and record video for future reference,

The LASSIE System, Seagrave's breakthrough product, is based on years of research in low-frequency soundfield visualization. According to key Home Theatre installation gurus, Seagrave's latest offering is "A breakthrough! Extremely clever, and a real time saver in serious acoustics treatments!"

  View a video of the LASSIE System
in action
 
  LASSIE Demo  
 
Movie is playable with Windows Media Player.
Since the sweep starts at 20 Hz (subwoofer frequencies), most computer speakers will not reproduce the sound until the end of the movie. To hear 20 Hz, you will need a subwoofer!
 

This video shows a 5 x 5 array of sound sensors deployed in a home theatre. The sound system is reproducing a 20 to 200 Hz frequency sweep generated by a software application on a laptop. The video shows sound pressure level at each sound sensor indicated by the brightness of the LED.


  View a video of the LASSIE System
in action in a College Theatre
 
  LASSIE Demo 2  
 
Movie is playable with Windows Media Player.
The clip starts with 5 seconds of pink noise to excite all the sensors, then the sweep starts at 20 Hz (subwoofer frequencies.) Most computer speakers will not reproduce the sound until near the end of the movie. To hear 20 Hz, you will need a subwoofer!
 

This video shows a 10 x variable array of sound sensors deployed in a college theatre, every other seat. The sound system is reproducing a 20 to 200 Hz frequency sweep generated by a software application on a laptop. The video shows sound pressure level at each sound sensor indicated by the brightness of the LED.


Seagrave Instruments
A designer and manufacturer of instrumentation for Home Theatre and professional acoustics instrumentation, Seagrave Instruments was founded in July 2007 to provide Home Theatre installers and other acoustics professionals with new tools to enhance their ability to visualize soundfields.

For more information about the LASSIE System, see our About and Products pages.


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