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A low hum or buzz sound can be heard
Power cords or lighting placed near this product.
Analogue inputs not connected securely.
Sound is not audible from one channel
Speaker connections disconnected.
Speaker set to “None” in OSD setup menu.
Sound cuts off when listening to music or there is no
sound even though power is ON
Speaker impedance is less than prescribed for the 551R.
The unit is not adequately ventilated and may be overheating.
Low bass or “phasey” response
Speaker polarity (+/-) of one or more speakers is reversed.
An unusual hissing noise is heard when listening to a radio
broadcast in stereo, but not heard when listening in mono
A slight noise may be heard because the method used for modulation of FM
stereo broadcasts is different than that used for mono broadcasts.
Aerial quality also effects the level of hiss heard.
Noise is excessive in both stereo and monaural radio broadcasts
Poor location and/or direction of the antenna.
Transmitting station is too far away.
No sound from the rear speakers
Source being played is not recorded in surround sound.
Speaker/s set to “None” in OSD setup menu.
A stereo mode has been selected.
No sound from the centre speaker
Centre speaker has been set to “None” in OSD setup menu.
A stereo mode has been selected.
No sound from the subwoofer
Sub has been set to ‘Off’ in the OSD setup menu or via the remote.
DTS Neo:6, DD PLII/IIx modes (which have no LFE channel) have been
selected with all speakers set to “Large”.
Remote control is not working
The batteries are flat.
The remote is too far from the receiver or out of the effective range.
No sound from speakers when connected to a digital
input
Audio input type is set to analogue (check display). Press the Audio Input
Type button to switch to digital.
No sound from speakers when connected to an analogue input
Audio input type is set to digital. Press the Audio Input Type button to switch
to analogue (check display).
Audio input type can also be set in the Input/Output Setup menu of the OSD.
No Sound from any speakers
Receiver is set for ‘Pre-out’ operation.
By entering the OSD menu, selecting the input/output setup menu, the
Preamp out setting can be changed from ‘Normal’ to ‘Pre-out’. This disables
the internal amplifiers when an external decoder amplifier is being used.
Reset this to ‘Normal’ to restore sound.
No Sound from front speakers, but rear speakers work
Receiver is set for ‘Ext 2Ch’ operation.
By entering the OSD menu, selecting the input/output setup menu, the
Preamp out setting can be changed from ‘normal’ to ‘Ext. 2 Ch’. This disables
the internal amplifiers for the front channels when an external amplifier is
being used to drive those channels. Reset this to ‘Normal’ to restore sound.
Troubleshooting