DSP parameters

Each DSP preset’s parameters allow you to control how it processes the sound. You can adjust these parameters while you are listening to a source to achieve exactly the effect you want. Any changes you make are temporary, and when you select another source the parameters are reset to their standard, recommended values. This section describes some of the most useful DSP parameters.

If you want to make permanent changes to the DSP parameters for a DSP preset, or create a new DSP preset with your own settings, use the Store function. For more information see the G Series Digital Surround Controller Installation Guide.

Changing the frequency response

The Treble and Bass parameters allow you to adjust the slope of the whole frequency response and the bass response respectively. They affect the sound from all channels.

Moving the spatial position of the sound

The Balance parameter adjusts both volume and delays for each channel to move the sound to an off-centre listening position. The Centre, Rear, and Side Level parameters adjust the relative level of the corresponding speakers to allow you to move the spatial focus of the sound. For example, the level of the rears can be reduced if they are distracting with music material.

Adjusting the width of the sound field

Trifield and Super provide a Width parameter which adjusts the width of the image created by the three front speakers.

Adjusting the relative delay of each channel

The Depth, R Delay, and S Delay parameters allow you to adjust the delay of the centre speaker, rear speakers, and side speakers relative to the main left and right speakers. Increasing the delay makes the corresponding speaker sound farther away, and reducing it brings the sound closer. These are probably the most important parameters in creating a convincing three-dimensional sound field.

Changing the absolute phase

The Phase parameter changes the phase of the signal to all speakers. This can alter the ambience and bass impact for some material.

Selecting which surround speakers are used

Some DSP presets allow you to select which of the side or rear surround speakers are used, for the best surround effect.

Filtering the surround speakers

On some DSP presets you can also change the low-pass filtering of the surround speakers to avoid distracting high-frequency sounds.

Using room correction

The G68 incorporates Meridian Room Correction, a unique system that compensates for acoustic deficiencies in your listening room, particularly at the bass end. It achieves this by automatically analysing the room response and then using Digital Signal Processing (DSP) to build a set of filters, called a profile. This audibly improves the sound by eliminating resonances and making the decay time consistent for frequencies below about 250 Hz.

Using the dynamic range control

The G Series digital surround controllers allow you to take advantage of dynamic range information provided in Dolby Digital sources, such as movies on DVD, to allow you to compress the dynamic range without compromising the sound quality. Useful settings are Quiet Boost, which raises the volume of quiet sounds for listening with background noise, and Loud Cut, which reduces the level of loud sounds, such as for late night listening.

Note: If you are using the digital surround controller with a Meridian DVD player your dynamic range control may be located in the DVD Setup menus; see the G Series DVD Player Installation Guide for details.

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