We used a DAK wireless PA at a recent concert, and found out it does not work well for rock and roll or louder volume stages. It can't transmit over 100 feet or so, and that is not enough to get it away from the stage. Plus the wattage (about 10 watts) is not enough to be worth doing that.
The sound is pretty good if you are doing something with just voice or several voices, it comes with a microphone that is wireless. We bought the $50 line input device and played a boombox through it, and it actually worked 125 feet away around corners. But it would not transmit through a human body, we would turn away from the transmitter device with it our hands and the signal would vanish.
Customer service is very good, though it took a few voice mail messages to get through. One of the two units we bought failed, the power supply burned up probably. We powered them with a 12 volt tractor lawnmower battery, which probably would power it for at least 10 hours. The device will run on 8 D batteries, but they only last 4 hours or so. Or you can use AC power, but we wanted wireless battery due to the nature of the terrain and access to power.
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