I have a WT-800 that I use in stereo mode. Each side drives two Eden D112XLT cabs that are rated at 8 ohms (4 cabs total - 2 on each side of the amp) which equates to a 4 ohm load on each side of the amp.
In stereo mode, each side of these amps (WT-800/600/500) can go down to a max of 4 ohms. So when I hang two 8 ohm cabs on each side it takes the load on the amp down to 4 ohms. Basically what I'm saying is that the output can be either 8 ohms or 4 ohms in either bridged or stereo mode. It just depends on how many cabinets you hang on it and what their ohm rating is.
Your amp is rated at 250 watts a side with a 4 ohm load. That would be either two 8 ohm cabs or one 4 ohm cab. If you used just one 8 ohm cab on a side you would probably get a power output somewhere around 175 watts.
Hope this helps....................
