Abbingdon Music Research AM-77 Reference Class User Manual
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4.5 OptiProtect® Speaker Overload Protection
Within OptiProtect® the AM-77 has an in-built speaker protection circuit.
This is mainly a final safeguard against equipment failure and/or extreme levels of over-driving the amplifier and
speakers.
When the display shows:
S
p
e
a
k
e
r
P
r
o
t
e
c
t
i
o
n
E
n
g
a
g
e
d
!
This indicates that the AM-77 has detected an output condition that could potentially damage the speakers connect-
ed to it.
Normally switching the AM-77 off, waiting 30 seconds and switching it back on will reset the protection circuit if the
cause was for example, excessive signal levels. In the extremely rare event that an internal malfunction of the AM-
77 is the cause for the protection circuit to engage, the protection will re-engage on switch-on, indicating the need
for the AM-77 to be serviced.
Sometimes there
are excessive
mains fluctuations
...OptiMains® will
detect and protect