"It has several possibilities.
You can use it full-range, that way one input will feed all speakers. A build in 300hz highpass filter will keep low frequenties from going to the 2 x 10".
In full-range mode you can switch impedance to 6 ohm or 3 ohm. This is tricky 'cause it's mentioned as 'high impedance' and 'low impedance'.
As some of you may know, many bassamps don't allow impedance below 4 ohm, so it's a mistake not to mention the figures.
You can also use it Bi-amp and that's exactly what it's made for ! One speakon will be high in at 8 ohm and the other is low in at 4 ohm or 16 ohm switchable with the high/low switch.
There's also a chrome 3/4" horn in the upper cab with a attentuator at the back."