Agree with analogboi. The capacitors you see on the outputs typically are high-pass caps for the tweeters, which are run in parallel with the woofers, which aren't subject to those caps. The large 1000uf caps aren't attentuating the signal because they aren't signal capacitors. Rather they are there to give the amps additional oomph during high current demands. Low frequencies consume much much more current than high frequencies and during these instantaneous high current draw requirements, the power supply may not be able to supply it, which is where the caps come in. The reason that the GF-777 isn't as strong on the amps, is that it uses 4 SE amps to do their business and these amps are only rated at 5-7 wpc under best case scenarios.
As for the T-amp, notice that the chip doesn't even employ a heat sink. Although I don't have any experience with them, I secretly wonder how much current they can "sink" if there is no heatsink, and you need lotsa current to make those woofs fly! Then there is the "boombox" factor which is to say aren't typically used to listen to classic music. They are cranked!
