For those of you who want to know what the heck an "Ohm" is, but were too shy to ask, here's a great explanation from the Row's own DaveB.
"Ohms are the unit of measurement for electrical impedance in alternating current (ac) circuits. The omega symbol
Ω
is often used to specify ohms on spec sheets instead of spelling out the word "ohms." In order to operate at peak efficiency, the output impedance of the source (bass amp) must match the impedance of the load (speakers). You may have noticed that speaker cabinets are generally either 4 ohms or 8 ohms. If you hooked up two 8 ohm cabinets to the amp you would have a total impedance of 4 ohms. Likewise, two 4 ohm cabinets would be a 2 ohm total impedance load. The reason that the total impedance is less than the individual impedances of the individual cabinets is that they are connected in parallel. Think of it as if the amp is a bucket of water. If you punch a hole in the bucket the size of the hole will determine the amount of impedance to the flow of water. Bigger holes equals less impedance. Likewise, multiple holes of the same size will also decrease the impedance to the flow.
The switch on this particular amp allows you to match the output impedance of the amp to the total impedance of the connected speakers."
DaveB
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