I believe that though the wattage is the same, the t-50 puts out more current-it is a different design-In truth with spicas either amp would be sufficient, they're both muscular for their sizes. Threshold, I heard on line, is open for service and may have reopened for business-I read this in an audio-review, review. it is second hand and should be treated as such.
good luck
cbird
good luck
cbird