A good friend of mine has one of
these that he uses to transmit audio from his main AV room to his kitchen. Note that this is a 5.8ghz unit, which gets you out the of the frequency range of microwaves and 802.11 signals. It can also do video, though my friend doesn't use this feature so I can't comment as to the quality.
Attached to the receiver in the kitchen is a decent Altec Lansing powered speaker+sub combo. It sounds great. Nothing about the sound suggests that it's a wireless connection.
It also has a remote IR blaster feature as well, so you could control your gear from the kitchen.
And as far as the T-Amp goes, I have a
Gen 2 T-Amp powering a pair of M22's in our bedroom. It works very well for this and sounds fantastic. The only drawbacks are that the build quality feels like something won at a carnival and that the volume control is simply a knob, as you mentioned. No remote power/volume.
