Reverse Speaker Selector

Im having trouble finding a good way to run two sources into one pair of speakers. I have a pair of Dahlquist DQ-10's and a HT reciever right now, but id like to run them through a better stereo set-up for 2-channel stuff. I found a few multi-zone speaker selectors that let you hook up two sources, but they all have a power limit on them (ie 50W, 100W). With the dahlquists id like to run quite a bit more than that into them so that doesnt work. If anyone knows of some way to do this any help is appreciated.