With a pair of L1 Compacts and also using an L1 PAS system, and high quality mics, I never had a feedback problem. I used the Samson Q7, Sennheiser E855 and Crown CM 311A all with outstanding results and no feedback whatsoever. With a pair of L1 Compacts, I could easily entertain an audience of 200 people. With the L1 PAS, I performed to an audience of 1,000 in a big top tent in Ocean City, Maryland.
Good luck,
Gary