Crate Amplifiers SPA-1400 - Manual (Page 11)

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SPA-1400/1400C
Rack Mount Power Amplifier
Speakon ® is a registered trademark of Neutrik USA
Installation and Operation:
Bridged Mono Operation:
The two internal power amplifiers can be bridged together to form a single, higher-powered amp. In the Bridged Mono
Mode, the amplifier uses channel 1's INPUT jacks and LEVEL CONTROL ; channel 2's are disconnected. Channel 2's power
amp receives its signal from a tap after channel 1's LEVEL control, but prior to channel 2's Limiter, so each channel is inde-
pendently protected. The BRIDGE MONO SWITCH (#17) must be pressed in. Because both channels are being used (bridged
in series), the minimum speaker load impedance is 4 ohms.
The RED binding post terminals (ch 1 = “+”, ch 2 = “–”) or the middle Speakon ® jack must be used to connect the ampli-
fier to the speakers. See the wiring diagram below for the Speakon ® jack.
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).