Hi there,you could use the line out of the Model-T and go to another amp input,ideally a power amp not another preamp/power amp combination.I would be inclined to look for a Sunn Concert or Colliseum Slave/Power amp and use that on the second cab.Or you could use the 2000S head on the second cab and "y" the inputs from the Model-T and the 2000S together.Hope this is of some help,good luck,Mel.