Crate Amplifiers SPA-1400 - Manual (Page 16)

1 6
SPA-1400/1400C
Rack Mount Power Amplifier
Speakon ® is a registered trademark of Neutrik USA
Installation and Operation:
Biamping: SPA-1400C – One Stereo Amplifier:
A single SPA-1400C can be used to power separate low and high frequency cabinets (shown below), or to separately power
the lows and highs of a cabinet with biamp inputs (for speaker connection information see page 14). The MONO/STEREO
SWITCHES (#16 & #17) must both be in the OUT position. Here we show using channel 1 for the low frequencies and chan-
nel 2 for the highs – you may reverse the channels if desired, as long as the LOW/HI SEND SWITCH (#22) is set to “2/1” and
the cabinets are reversed from what is shown below. Since the SPA-1400C has a built in active electronic crossover, a sepa-
rate external electric crossover is not needed – run the output from the mixer directly into channel 1 of the amplifier. Use the
CROSSOVER FREQUENCY CONTROL (#24) to set the cut off frequency for the low frequency cabinet. The LEVEL CONTROLS (#15)
allow proper balancing of low and high frequency volume levels.
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.
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 an appropriate low frequency cut.)
OUT