I agree for the most part with Tom.
The BC415 has around (I don't remember exactly) 10dB forward directivity around 80hz. Down at 35Hz it is like 4dB or more.
They could be put in V formation to gain some more forward directivity and narrow the pattern in one plane-if that is needed.
It is hard to say how well the pair of SM80s would cover-without knowing more details.
You could forward the model to
[email protected] and have him take a look at it. There is no charge for modeling or reviewing models. We HIGHLY encourage it.
He is doing a lot of the modeling-or will pass it on to somebody to look at.
I am not doing as much modeling these days and am basically "out of pocket" till the endish of June.
One thing to consider-the "power rating" on the Sm80 is actually a bit low.
This is due to the fact that the actual impedance is a good bit higher than the rated 8 ohms. So the voltage used to calculate the power is based on 8 ohms, so the actual power (which would result in greater output SPL) could be higher.
When you say you want 102dB is that A or C weighted? 102 A is pretty loud-especially for a church.