I have concerns about overpowering/under-powering my passive speakers during live church recordings. I have two large speakers that are powered by an external amplifier (these are passive speakers). There are NO settings on the speakers themselves. All you can do is plug in the audio cable. The amplifier, on the other hand, has an adjustable gain control for each channel. I'd like to know the implications of using this control. Suppose I'm monitoring my audio mixer via headphones, and all sounds good. However, the loudspeakers are too quiet, but I don't want to boost either the channel faders nor the main faders too far about 0dB. My obvious option is to boost the gain on the amp. But how much is too much? Obviously if it starts to clip, it's too much. But in the middle of the service, I don't want to be fiddling with the amp gain. Isn't there some kind of power rating that I can use to match the output of the amp to the MAXIMUM allotted input on the speakers? Also, in boosting the amp gain, am I also boosting the noise floor? As you can see, I know how to connect the amp to the speakers, but I don't know how to operate the two in tandem. Thanks!