Australian Monitor SY800 - Manual (Page 12)

12 Controls & Connectors
attenuator. The output from channel B will
automatically be of the opposite polarity
(reversed phase) and speaker termination should
be sourced from the red binding-post outputs.
Alternatively, the speaker could be connected to
poles 1+ & 2+ of the 4 pole speaker connector
(see Installation - Output Wiring on page 11).
The SY400V & SY800V cannot be bridged.
with the limiter
switch engaged.
The SY6125 allows bridging of channels B & C
and channels D & E. The bridge switch is located
on the rear panel. When channels B & C are
bridged, channel B input should be used and the
red binding post of channel B is positive while the
red binding post of channel C is negative. When
channels D & E are bridged, channel E input
should be used and the red binding post of
channel E is positive while the red binding post of
channel D is negative.
The SY4200 allows bridging of channels A & B
and channels C & D. This is done through the lid
with a switch. Sliding the switch toward the rear
enables bridging. When channels A & B are
bridged, channel A input should be used and the
red binding post of channel A is positive while the
red binding post of channel B is negative. When
channels C & D are bridged, channel C input
should be used and the red binding post of
channel C is positive while the red binding post of
channel D is negative.
It is important to always operate your
SY400V or SY800V amplifier
The nature of transformers means that peaks in
program music could saturate the internal
transformer and/or the speaker transformers
attached to the amplifier. When a transformer
saturates, it no longer acts as a transformer but
rather as a thick piece of wire. This appears to
your amplifier as a short circuit so it will protect
14 Limiter Switch
Pushing this switch in engages the clip limiter
circuitry. On the SY6125 & SY4200 the limiter
switch is located inside the amplifier and is
accessed through the lid. Slide the DIP switch
up/towards rear of amplifier to engage the limiter.
The threshold level is referenced to the supply rail
and the output voltage is sampled allowing true
clip detection and limiting.
NOTE:
itself and shut down. This is worst at lower
frequencies. Engaging the limiter helps control
this problem.
The SY4200 and SY6125 have low pass filters
included on-board the amplifier. The filters are
preset to 125Hz with 18dB/octave roll off.
On the SY4200 the filter is only on channel C but
will also affect the bridged configuration. This
arrangement is suitable for 2.1 systems with the
stereo left/right pair on channels A & B and the
sub on the bridged channels C & D. The channel
C input should be used. The filter is engaged by
sliding the switch located through the top lid to the
rear of the amplifier.
On the SY6125 there are two filters. One filter is
on channel B but will also affect the bridged
channels B & C. Channel B input should be used.
The other filter is on channel E but will also affect
the bridged channels D & E. Channel E input
should be used. Many configurations are
possible with this amplifier. An example would be
in a 5.1 system. Channels A & B running the left
and right, channel C running the centre speaker,
channel E bridged with channel D running the sub
and channel F running the rear surrounds. The
filters are engaged by sliding the DIP switch
located through the top lid to the rear of the
amplifier.
15 Filter Switch