Crate Amplifiers SPA-1400 - Manual (Page 10)

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SPA-1400/1400C
Rack Mount Power Amplifier
Speakon ® is a registered trademark of Neutrik USA
Installation and Operation:
Parallel Mono Operation:
The two internal power amplifiers (channel 1 and 2) can easily be driven by a single input signal. Connect the input sig-
nal to channel 1 and press in the PARALLEL MONO SWITCH (#16). (The BRIDGE MONO SWITCH , #17, must be in the OUT posi-
tion!) The signal will be fed to both channels, each with its separate level control (#15). (Even though the signal is fed only
into channel 1, channel 2’s
LEVEL CONTROL will still adjust the channel 2 output, independent from channel 1’s LEVEL CON-
TROL .)
Either the binding posts or the Speakon ® jacks may be used to connect the amplifier to the speakers. See the wiring dia-
gram below for the Speakon ® jacks. The total speaker impedance must be two ohms or more per channel.
NOTE: Your speakers may benefit from a low frequency cut, since frequencies below a speaker’s low-end response limit can
cause distortion or even damage. For this reason you might consider using an appropriate Low Cut Frequency (see #20 & #21)
with your speakers. Monitor speakers usually need a low cut for best performance (SPA-1400C only).
Select Low Cut Frequency if needed (SPA1400C only)