User guide

75
Troubleshooting
Audio problems
Hum on analogue input
Check the source equipment. Disconnect each
source in turn.
If the hum originates from a ground loop, an antenna
or cable supply may be the cause. In this case an
antenna-lead isolator should be fitted.
If the G65 seems to be the cause of hum consult
your dealer.
There is radio interference
The G65 is a digital audio and computing device
which has been designed to very high standards of
electromagnetic compatibility.
If this equipment does cause or suffer from interference
to/from radio or television reception then the following
measures should be tried:
Reorient the receiving aerial (or antenna) or route the
antenna cable of the receiver as far as possible from
the G65 and its cabling.
Ensure that the receiver uses well-screened antenna
cable.
Relocate the receiver with respect to the G65.
Connect the receiver and this product to different AC
outlets.
If the problem persists contact your dealer.
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.
If the centre is a Meridian digital speaker, check that
it is configured as left. If configured as right it will be
receiving the 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 47.
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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 G65 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.
Centre not working
There may be a connection problem.
If the centre is a Meridian digital speaker, check that
it is configured as left. If configured as right it will be
receiving the subwoofer signal.
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