Meridian Audio G68 manual Tr o u b l e s h o o t i n g, Audible hiss at high volume settings

Audible hiss at high volume settings

The input dynamic range of most current recordings is at maximum 16 bit. The reason for this is that currently CD, DVD, and LaserDisc use a 16-bit standard, although DVD can support up to 24-bits. The analogue sources you have cannot achieve this kind of range. For comparison, analogue sources are likely to be of the order of:

•VCR, 12 bits.

•FM radio, 13 bits.

•Reel to reel tape, 13 bits.

•Cassette tape, 12 bits.

•LP, 11 bits.

Note: There may be a difference between the dynamic range of the source channel when it is operating, and the noise you hear in standby. For example, LP normally has lower noise when the stylus is not in the groove; similarly tape will be quieter when it is stopped. CD may also be quieter when it is stopped, producing so called ‘digital silence’.

The G68 has a 24-bit capability on its internal analogue-to-digital converter, which is used for analogue sources. When the volume is turned up high you may hear its dither as a hiss when the sources are stopped. This hiss is lower than the background noise of your recordings and should be of no consequence.

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Tr o u b l e s h o o t i n g

Sound not clear

•If speech sounds muffled in a system with a centre speaker, check that sound is coming from the centre as there may be a connection problem. In a digital or Meridian feed to the centre you may have set it up to be right instead of left so that it is playing a subwoofer signal.

•If speech sounds muffled in a system with no centre speaker, you may have selected a layout that expects one. See Configuring speakers, page 28.

Centre not working

There may be a connection problem.

•In a digital or Meridian feed to the centre, you may have set it up to be right instead of left, and therefore it may be playing a subwoofer signal.

There is a hiss when starting DTS LaserDiscs or CDs

The DTS audio stream is indistinguishable from a PCM audio stream; the G68 takes 30ms to identify the encoding, during which a hiss is heard.

•With non-video DTS sources you can add a 30ms delay to avoid this.

•With video sources you can create a DTS-only source to avoid any hiss.

For more information about each of these options see the Meridian

Configuration Program Guide.