Thaks for the tip. Their mics look like this model:
Audio-Technica - Microphones, headphones, wireless microphone systems, noise-cancelling headphones & more : PRO 37 Small-Diaphragm Cardioid Condenser Microphone
I was at a local church doing some work and the pastor asked me to give advice for his choir mics. It seems they don't work very well. Well, the first thing I noticed is that they were using some short AT condensers and since the were hanging from the ceiling, the were pointed straight down...