Hi all! As you can see in my profile, I own a Yorkville 400B bass amp with a 15" cab. This is a combo. My amp is rated 400w at 4ohms, and now I´m looking into the possibility of a new amp rack. I´m tired of this combo, and I´m going to (sometime in the future) take the amp out of the combo, and have myself a 1x15" and 2x10" or 4x10". Then put the amp in a rack with a tuner, maybe a power conditioner etc. This means that I will be looking for 8ohm cabs. My question is, how many watts will the cabs have to be in order to be safe? 200?300?400? more?