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SM-500 USER GUIDE • 7
POWER ON/OFF SWITCH
Moving the Power switch to the “On” position will turn on you amplifier as indicated by the Power LED
lighting.
SM-500 REAR PANEL FEATURES
AC CORD RECEPTACLE
The SM-500 accepts a standard AC power cable (supplied with the SM-500), used with almost all cur-
rent musical, professional and household electronic devices. If it becomes misplaced, a replacement
can be purchased at almost any computer, electronics, or pro audio store.
Note: The rating for this cable is 3 conductor, 10 amperes minimum. If replacement is neces-
sary, or if you need a longer cable, look for the rating on the cable and be sure it is at least
10 amps.
Make sure the AC cord is plugged in all the way in both the amp and the wall socket. If your cord
ever becomes frayed or split, replace it immediately.
POWER AMP ASSIGN SWITCH
The position of the Power Amp Assign switch determines the SM500’s mode of operation (based on
the impedance of the cabinet or cabinets that you intend to use). If you want to run your amplifier in
Stereo mode, move the Power Amp Assign switch to the “Stereo” position. Operation in Bridge mode
is achieved by setting the switch to the “Bridge” position. (For Stereo and Bridge/Mono mode con-
nection information, see diagrams beginning on page XX.)
Minimum impedance in the Stereo mode is 2 ohms per side. This means that you can connect:
• One 2 ohm speaker enclosure per side
• Two 4 ohm speaker enclosures per side
• Four 8 ohm speaker enclosures per side
Minimum impedance in the Bridge/Mono mode is 4 ohms. This means that you can connect:
• One 4 ohm speaker to the Bridge/Mono output
• Two 8 ohm speaker enclosures to the Bridge/Mono output
• Four 16 ohm speaker enclosures to the Bridge/Mono output
Damage to the SM-500’s power amplifier section may occur if speaker enclosures are connected to
the speaker output section with impedances that total less than the minimum loads listed above. The
owner’s manual that came with your speaker cabinet should state its total impedance. On SWR
speaker enclosures, the total impedance is generally indicated on the speaker’s input panel.
To figure out the total impedance of two or more cabinets of equal value hooked up in parallel,
divide the impedance of one cabinet by the number of cabinets:
Impedance of one cabinet / number of cabinets = total impedance
For an in-depth discussion of impedance/power rating issues, we recommend reading the article
“Plug & Play,” which cane be found in the “Press” section at: swrsound.com