Meridian Audio Digital Surround Controller G61 Manual De Usuario

DSP presets for   two-channel material

The G61 provides several signal processing options for two-channel 

material. The Music DSP presets are designed for use with music 

from sources such as CD, radio, or two channel DVD-A:

• Music, Trifield, Ambisonics, Super Stereo, Music Logic, PLIIx Music, 

Stereo, and Direct.

The Logic DSP presets are designed for use with film soundtracks 

or TV programmes:

• PLIIx Movie, PLIIx THX, TV Logic, and Mono.

The Music and Logic DSP presets use the Music and Logic speaker 

layout respectively; see 

The Music DSP preset extracts the mono and surround components 

of the original recording. These components provide an alternative 

representation of the original sound, and this is sometimes used 

for recording systems or in broadcasts such as FM radio. The mono 

element is equalised using a proprietary Meridian technique to 

match the tone colour of the centre speaker, and to compensate 

for the fact that the frequency response of human hearing changes 

with direction. 

The Music DSP preset is recommended for recordings made with 

spaced omnidirectional microphones, or using a mono-surround 

technique.

As for the Music DSP preset, the Trifield preset extracts the mono 

and surround components of the original recording. It then 

calculates the signals for the front, left, centre, and right speakers, 

using the phase and amplitude differences between the three front 

channels, to redistribute the sounds on a frequency-dependent basis. 

This gives a significant improvement over traditional stereo, which 

converts the differences between the microphone signals into 

amplitude differences in the speaker signals. This version of the 

Trifield algorithm is virtually impossible to implement without 

digital signal processing.

Trifield is recommended for well-made recordings and stereo 

television broadcasts that are not Dolby Surround encoded. An 

advantage over the Music DSP preset is that the front stereo image 

is more focused, and the width of the image can be adjusted.

 Centre

Flat, EQ1-3

The timbre of the centre loudspeaker.

 Width†

0-1.5

The width of the image.

 Surr. Rear 

Surr. Rear, Surr. Side, Surr. All

Switches the surround signal between the side and rear speakers.

 R Filter

Off, 1kHz, 3kHz, 7kHz

The cutoff of high frequencies from the rear surrounds.

 S Filter

Off, 1kHz, 3kHz, 7kHz

The cutoff of high frequencies from the side surrounds.

†Trifield only.

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