THE REAR PANEL:
19.FUSE: This fuse protects the amplifier against damages caused by overload conditions in the unit. If the fuse blows, replace it only with the same size and type as indicated on the rear panel. If the fuse blows continual- ly, the line voltage may be incorrect, or the amp may need servicing.
20.AC LINE IN: Firmly plug the female end of the supplied power cord into this socket, pushing it in until it is fully seated. Plug the male end of the cord into a properly grounded AC out- let of the correct voltage. DO NOT
DEFEAT THE GROUND PIN OF THE AC PLUG! Use only the supplied power cord. If the amplifier is to be used outside of the United States, see your authorized Crate dealer for infor- mation about alternate line cords and power converters if needed.
21. CHANNEL SELECT/BOOST FOOTSWITCH JACK: Connect a stereo 1/4" plug (tip/ring/sleeve) here from either a two or three button footswitch (such as the Crate
22.REVERB FOOTSWITCH JACK: Connect a mono 1/4” plug (tip/sleeve) here from either a one or three button footswitch for reverb on/off control.
23.EFFECTS LOOP SEND: When using an external effects device, use this jack to send the signal from your amp to the effect. Connect a shielded instrument patch cord from the send jack to the input jack of the effect.
The send jack also doubles as a "preamp out" jack, to feed a
24.EFFECTS LOOP RETURN: Use this jack to return the signal from an external effects device back to your amplifier. Connect a shielded instru- ment patch cord from the output jack of the effect to the return jack.
The return jack also doubles as a "power amp in" jack, to feed a line- level signal directly into the internal power amp. This is useful when "slav- ing" two amplifiers together.
25.BALANCED OUT JACK: This XLR connector supplies a balanced output signal from the power amp for patching into a mixing board, recording console or external amplifier. The signal is elec- tronically compensated to simulate the sound of a "miked" cabinet.
26.SPEAKER JACKS: Use these jacks to connect the amplifier to your speaker cabinet(s). Use the “Main” jack first; never use the “Ext” jack if nothing is connected to the “Main” jack!
Always keep the impedance at 4 or 8 ohms, with the Impedance Selector switch (#27) at the proper setting.
IMPORTANT NOTE ABOUT CERTAIN EXPORT UNITS: In some areas 1/4” jacks are not acceptable for use on amplifiers capable of high output power levels. For this reason the 1/4” speaker jacks on your amplifier may be factory sealed. In this case, use the Speakon® jack to connect the amplifier to your speaker cabinet(s) using cables rated for high power, terminated with the appropriate connectors.
27.IMPEDANCE SELECTOR: For the best performance and least strain on your amplifier, you MUST properly match the impedance of your amplifier to that of your speaker cabinet(s). Set the selector switch to the 4 or 8 ohm position, depending on the total impedance of your speaker cabinet(s). The chart below can help you deter- mine that impedance based on the fol- lowing combinations of speakers con- nected in parallel.
CABINET | NUMBER OF | TOTAL |
IMPEDANCE | CABINETS | IMPEDANCE |
8 OHMS | 2 | 4 OHMS |
16 OHMS | 2 | 8 OHMS |
16 OHMS | 4 | 4 OHMS |
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Speakon® is a registered trademark of Neutrik USA
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