operation

I'll be returning to China again later this year for work for around eight weeks and was wondering if it is at all possible to visit or view any of the Warwick China operations whilst I'm over there. I would love to see where the Rockbass gear is made and lots of our amps and cabinets are...

I'm confused as to the impedance of my Pro Tube IX...Apparently it's a stereo amp, 450W @ 4 ohms each side in stereo, but does that mean I can have two 4 ohm cabs??? Or do I want two 8 ohm cabs for a total impedance of 4 ohms?? I also have the option of running it in mono too. I'm new to...