Diki has a point, and I had the same concerns about 7 months ago when I was seriously considering the purchase of a Countryman E6 mic. However, my fears were quickly aleviated when I went to my daughter's church for my grandson's Christening. The church was huge, had lots of hard surfaces, high ceiling, etc..,the worst accoustics anyone could imagine.

Hanging on wall on both sides of the alter were a pair of Bose towers stacked three high instead of two-high, which is how the L1 is configured. Both preachers, the choir director, a lady minister, and a half-dozen singers were all using wireless Countryman E6 mics. At times they walked within two feet of the towers, and not once during the hour we spent there did the system experience any feedback at all. I've had similar experiences using the Samson Q7 handheld and Crown CM311A headset mics. I imagine that if someone were to use an inexpensive, omni-directional mic with the volume cranked up high and then stand within a foot of the tower it would likely produce some feedback. And, of course, the mic's EQs will also have a bearing on this as well.

The best aspect, though, is that if the system doesn't work out, they can always send it back to Bose within the 45-day prescribed trial period for a full refund.

Good Luck,

Gary

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Travlin' Easy