T+A AMP 8 User Manual page 29

No output signal at the
loudspeakers; the
speaker-LED flashes (the
PROTECTION circuit has
tripped).
Unit switches off
repeatedly at fairly high
volume levels.
Flat sound image,
insufficient bass
response.   
Cause 1:
The PROTECTION circuit has tripped due to overheating or
overloading.
Remedy:
Reduce volume and wait for about 20 seconds. If the unit does
not switch on again automatically, it has become too hot and
should be left switched off for a few minutes to cool down.
If the AMP 8 doesn't turn on after a cooling period of 30
minutes, then please contact an authorised retailer.
Cause 2:
Short-circuit in the speaker leads, e. g. stray wire ends
touching at the speaker terminals, or mechanical damage to
the cables.
Remedy:
Check speaker leads and terminals, twist wire ends together
neatly, replace damaged cables.
Cause 1:
Overheating due to heat build-up.
Remedy:
Set up the unit in such a way that an unobstructed flow of
cooling air is guaranteed.
Cause 2:
Overheating through insufficient loudspeaker impedance.
Remedy:
Use only loudspeakers of at least 4 Ω impedance (DIN rating).
That means a minimum impedance of > 3.2 Ω.
Cause 3:
So called "clipping" has occurred (a temporarily cut signal
peak). Clipping can harm the loudspeaker (tweeter) or damage
them completely.
The AMP 8 protection is able to detect even small distortions
during music playback and shutting OFF the speaker relays
immediately to effectively protect your loudspeakers.
Remedy:
Reduce the volume setting to a lower level so that no clipping
does occur.
Cause:
The loudspeaker cables are connected with reversed polarity.
Remedy:
Check the speaker connections at the loudspeakers and at the
integrated amplifier's speaker terminals; correct if necessary.
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