Chevin S1500 - Subsonic Filter Settings; Subsonic Filter Usage; Grounding and Noise Reduction; Operating Modes

Subsonic Filter
The subsonic (low-frequency) filter rolls off signals below 40Hz.
This means more power is available for the speakers’ rated frequency range.
The filter settings for each channel are controlled individually through the switches.
If the subsonic filter is off, there is 5Hz rolloff available to protect against DC or
sub-audio inputs.
When to use the subsonic filter
As a rule, speakers sound better with proper filtering. Unless you already have filtering in a
preceding device match the setting to the low frequency rating of your speakers.
Speakers with bass reflex are especially sensitive to frequencies below their rated limit.
The “OFF” position (= the subsonic filter is not used) should be used only for such applications
as studio playback monitoring, where you need to know the presence of unwanted sub-audio
signals in your mix.
GND Ground
The GND switches help you to avoid ground noise loops. Whenever the power
amplifier is installed in a 19" rack system being operated together with other
equipment, the recommended setting of the switch is ON. In case the power amplifier
is used together with equipments that are connected to different ground potentials,
the recommended setting is OFF.
Stereo Mode
Stereo mode is the “normal” way of using the amplifier. Each channel is fully independent,
seperate signals are connected at the inputs and seperate speakers are connected at the
outputs. Gain, filtering and limiting are fully independent and control their respective channel.
The amplifier works in stereo mode when 3-position switch is set on STEREO.
SEND: The same signal that is present at the INPUT connector is at the SEND connector to link
to other equipment.
Mono Mode
When the switch is set on MONO the amplifier operates with channels A and B having the same
signal. Each channel drives its own speaker and uses its own gain control, filter and clip-limiter
In mono mode you can use the other input connector to carry the signal to the other amplifiers.
This is often called “daisy chain“.
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