Crate Amplifiers SPA-1400 - Manual (Page 20)

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SPA-1400/1400C
Rack Mount Power Amplifier
Speakon ® is a registered trademark of Neutrik USA
Installation and Operation:
Triamping: SPA-1400C:
A pair of SPA-1400Cs can be used to power separate low, mid and high frequency cabinets, or a separate subwoofer and
biamped full range cabinet. In the example shown, a bridged mono subwoofer, the BRIDGE MONO SWITCH (#17) of the low
frequency amplifier must be in the IN position; the MONO/STEREO SWITCHES (#16 & #17) of the mid/high frequency amplifi-
er must both be in the OUT position. Use channel 1 of the mid/high amp for the low/mid frequencies and channel 2 for the
highs. Since the SPA-1400Cs have built in active electronic crossovers, separate external electronic crossovers are not need-
ed – run the output from the mixer directly into channel 1 of the low frequency amplifier.
Connect the additional amplifier/speaker combinations to the SPA-1400C’s BALANCED THRU jacks - .
Connect the channel 2 BALANCED THRU/X-OVER OUT jack (#18) of the low frequency amplifier to the INPUT jack of the
mid/high frequency amplifier. The channel 2 X-OVER OUT/THRU switch (#19) must be pressed in. Use the CROSSOVER
FREQUENCY CONTROLS (#24) of each amplifier to set the cut off frequencies for each cabinet.
Either the binding posts or the Speakon ® jacks may be used to connect the amplifiers to the speakers. See the wiring dia-
grams below for the Speakon ® jacks.
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 (SPA-1400C only). (Even some subwoofers perform better with a slight low frequency cut.)
OUT OUT OUT
1 1
Set to proper mid/high crossover frequency
SPA1400C
2 2
SPA1400C
OUT