Crate Amplifiers SPA-1400 - Manual (Page 12)

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SPA-1400/1400C
Rack Mount Power Amplifier
Speakon ® is a registered trademark of Neutrik USA
Installation and Operation:
Patching Two Bridged Mono Mode Systems:
Two Bridged Mono amplifiers can be patched together by connecting a signal cable between their input jacks (the dashed
line in the illustration below). (On the SPA-1400C, another option is connecting a balanced XLR cable from the first amp’s
BALANCED THRU jack [#18] to the XLR input of the next amp – the dotted line below.) The BRIDGE MONO SWITCH (#17) must
be pressed in. Because both channels are being used (bridged in series), the minimum speaker load impedance must be 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 ® 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).