Room Correction; Introduction - Meridian Configuration Program Configuration

The G68 and 861 digital surround controllers incorporate room correction, which takes
advantage of advanced digital signal processing techniques to compensate for room artefacts,
including resonances and reflections, to give a significant improvement in the sound.
This chapter explains how to use Meridian Room Correction to create profiles for use with the

Introduction

The Meridian Room Correction procedure creates a set of one or
more room correction profiles matched to your room. These are then
downloaded to the digital surround controller and can be associated
with particular presets, or selected from the front panel. Selecting a
profile applies a set of digital filters individually to each speaker to
achieve the required room correction.
If you use a single speaker layout you may choose to have one
room correction profile, and use this with all presets. If you have
separate speaker layouts for use with Music, Logic, and 5.1 Movie
sources you will need to calculate a separate room correction profile
for each speaker layout. These will then be selected automatically
by the digital surround controller depending on the audio format. In
addition, you can create separate room correction profiles to take
account of changes to the room, such as the position of large items
of furniture, or with curtains open or closed.
Configuration Guide.indb 31 Configuration Guide.indb 31

Room Correction

digital surround controller.
How room correction profiles are
calculated
Calculating a room correction profile is a time-consuming and
mathematically complicated process. Meridian Room Correction
performs the necessary sequence of measurements and calculations
automatically, using a PC connected to the digital surround
controller, with the minimum of interaction. It works as follows:
First you need to set up a microphone close to the listening
position, and connect this to an appropriate input on the digital
surround controller. On the G68 Digital Surround Controller this will
be A8 (L). On the 861 Reference Digital Surround Controller this can
be any analogue input; input A1 on card IA00 is chosen by default.
Usually a standard sound pressure level meter will be used as a
microphone; this can be the same one used for setting the speaker
levels during the Calibration procedure. After an initial short test
sequence, designed to check that the microphone is set up correctly,
3 1
R o o m
c o r r e c t i o n
12/11/04 3:35:30 pm 12/11/04 3:35:30 pm