Qsc isa 1350 用户指南
5
EN
Selecting Stereo, Parallel, or
Bridge Mode
Bridge Mode
The amplifier can be set for normal Stereo
mode, Parallel Input mode, or Bridge Mono
mode.
mode, Parallel Input mode, or Bridge Mono
mode.
Stereo Mode- Each channel remains inde-
pendent, and may be used for two different
signals.
pendent, and may be used for two different
signals.
Parallel Mode - This setting connects
both inputs together. One signal feeds both
channels. Each channel's Gain control and
speaker connection remain independent.
both inputs together. One signal feeds both
channels. Each channel's Gain control and
speaker connection remain independent.
Bridge Mode- This setting combines both
channels of a pair into a single channel
with twice the output voltage. Use only the
first channel's input and Gain control. Set
the second channel's Gain control at mini-
mum. The load must be rated for the higher
power (or voltage) and is connected as
shown on pages 6 and 7.
channels of a pair into a single channel
with twice the output voltage. Use only the
first channel's input and Gain control. Set
the second channel's Gain control at mini-
mum. The load must be rated for the higher
power (or voltage) and is connected as
shown on pages 6 and 7.
Do not connect more than one
input when operating in parallel
or bridge mode.
input when operating in parallel
or bridge mode.
Setting Low Frequency Filters
ISA 280, ISA 450, ISA 750 and ISA 1350:
Use of the Low Frequency Filters is recom-
mended. Use the appropriate switch set-
tings to turn the filter ON or OFF and to
select the filter frequency. When set to the
ON position, the channel has a 12dB per
octave Low Frequency filter to limit subau-
dio cone movement, making more power
available for the loudspeaker’s rated fre-
quency range. The filter should only be
turned OFF for driving subwoofers.
Use of the Low Frequency Filters is recom-
mended. Use the appropriate switch set-
tings to turn the filter ON or OFF and to
select the filter frequency. When set to the
ON position, the channel has a 12dB per
octave Low Frequency filter to limit subau-
dio cone movement, making more power
available for the loudspeaker’s rated fre-
quency range. The filter should only be
turned OFF for driving subwoofers.
ISA 300Ti, ISA 500Ti, and ISA 800Ti: The
Low Frequency Filters are always active
and not defeatable. Each channel has a
12dB per octave Low Frequency filter to
prevent saturation of the 70V loudspeaker
transformers. This reduces distortion and
prevents amplifier overload. The 50 Hz set-
ting usually works well with high quality
loudspeaker transformers. The 75 Hz set-
ting works well with speech-grade loud-
speakers and transformers.
Low Frequency Filters are always active
and not defeatable. Each channel has a
12dB per octave Low Frequency filter to
prevent saturation of the 70V loudspeaker
transformers. This reduces distortion and
prevents amplifier overload. The 50 Hz set-
ting usually works well with high quality
loudspeaker transformers. The 75 Hz set-
ting works well with speech-grade loud-
speakers and transformers.
Ti Stereo Mode -
Switches 3, 4, 5, 6, 7,
and 8 are all set to the
LEFT position.
Switches 3, 4, 5, 6, 7,
and 8 are all set to the
LEFT position.
Ti Parallel Mode -
Switches 3, 4, and 5
are set to the RIGHT
position.
Switches 6, 7, and 8
are set to the LEFT
position.
Switches 3, 4, and 5
are set to the RIGHT
position.
Switches 6, 7, and 8
are set to the LEFT
position.
Ti Bridge Mode-
Switches 3, 4, 5, 6, 7,
and 8 are all set to the
RIGHT position.
Switch 10 is set to the
LEFT position.
Switches 3, 4, 5, 6, 7,
and 8 are all set to the
RIGHT position.
Switch 10 is set to the
LEFT position.
Low Frequency Filter-
Switches 2 and 3 con-
trol CH1. Switches 8
and 9 control CH2.
Switches 3 and 8 turn
the LF filter ON or OFF.
Switches 2 and 9
select 30Hz or 70 Hz.
Switches 2 and 3 con-
trol CH1. Switches 8
and 9 control CH2.
Switches 3 and 8 turn
the LF filter ON or OFF.
Switches 2 and 9
select 30Hz or 70 Hz.
ISA 280/450/750/1350
ISA 300Ti/ 500Ti/800Ti
Stereo Mode -
Switches 4, 5, 6 and 7
are all set to the LEFT
position.
Switches 4, 5, 6 and 7
are all set to the LEFT
position.
Parallel Mode -
Switches 4 and 5 are
set to the RIGHT posi-
tion.
Switches 6 and 7 are
set to the LEFT posi-
tion.
Switches 4 and 5 are
set to the RIGHT posi-
tion.
Switches 6 and 7 are
set to the LEFT posi-
tion.
Bridge Mode-
Switches 4, 5, 6, 7, and
8 are all set to the
RIGHT position.
Switch 10 is set to the
LEFT position.
Switches 4, 5, 6, 7, and
8 are all set to the
RIGHT position.
Switch 10 is set to the
LEFT position.
Ti Low Frequency Filter-
Switch 2 controls CH1.
Switch 9 controls CH2.
Switches 2 and 9 select
50Hz or 75 Hz.
Switch 2 controls CH1.
Switch 9 controls CH2.
Switches 2 and 9 select
50Hz or 75 Hz.