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Troubleshooting & Maintenance Lexicon
5-6
The RT-20 automatically downsamples digital audio sources
with high sample rates.
1. Set the AUDIO SETUP 1 menu PCM Down Sample parameter
to Off. When this parameter is set to On, the RT-20 automati-
cally downsamples 96kHz PCM signals to 48kHz before passing
them to the associated component.
2. If the loaded disc generates 192 or 176.4kHz signals, the RT-20
automatically downsamples these signals to 48 or 44.1kHz
before passing them to the associated component. The RT-20
will not pass 192 or 176.4kHz signals, even when the PCM
Down Sample parameter is set to Off.
3. If a DVD is loaded, the disc may have a copy-protection signal
that prevents it from generating 96kHz signals. When a copy-
protection signal is present, the RT-20 automatically downsam-
ples signals to 48kHz before passing them to the associated
component, even if the PCM Down Sample parameter is set to
Off.
A humming sound is present in the audio.
1. If a cable TV connection is present, disconnect the cable from
the wall outlet. If this eliminates the humming sound, an isola-
tion device is required. Contact the cable provider for assis-
tance.
2. Disconnect components one at a time to isolate the problem.
Once the problem is identified, make sure the component is
properly grounded and connected to the same electrical circuit
as the RT-20.
Dialog sounds muffled.
1. If the RT-20 has a stereo audio output connection, set the
Audio Out parameter to 2 Channel.
2. If the speaker setup does not include a center speaker, make
sure a center speaker is not selected with the component that
was used to configure speaker settings.
3. If the RT-20 was used to configure speaker settings, make sure
the Speaker Size screen C parameter is set to Off.
4. If a MC-12 or MC-8 Digital Controller was used to configure
speaker settings, make sure the CUSTOM SETUP menu CENTER
parameter is set to NONE.
RF interference is present in the audio output.
Make sure the RT-20 is not positioned near unshielded TV or FM
antennas, cable TV decoders, and other RF emitting devices that
might cause interference. Replace unshielded cables with shielded
cables whenever possible.
Volume level seems to differ between DVDs and CDs.
DVDs and CDs are recorded with different processes, which might
cause them to output audio at different volume levels.
The RT-20 will not pass Dolby Digital, DTS, or MPEG signals to
the associated component.
1. Make sure the AUDIO SETUP 1 menu Dolby Digital, DTS, and
MPEG parameter settings are compatible with the associated
component. For instance, the Dolby Digital Out parameter
should be set to Bitstream if the associated component is com-