However, there seem to be several kits available, and I just want to know how many channels the receiver handles. I would really like a pair of lapels and a wireless handheld, but will the receiver handle it? And about the butt plugs, will they work on a dynamic mic?
The Senn G2 kits come in 3 different frequency bands. Each frequency band has more than enough frequencies to switch to so you can find a free one to transmit on.
But what I think you are asking is how many different sources can be received by a given receiver at any one time. The answer is ONE. So you can have one lapel (lavaliere/lav) mic or one dynamic mic hooked up to the "butt plug" transmitter. If you want to use a condensor mic (that needs phantom power), you need to upgrade to the 500 series "butt plug" plug on transmitter, or use a separate mic preamplifier or phantom power box between the mic and the transmitter.
There are wireless receivers that will receive two channels, but they cost a LOT more.