With the batter box alone you should be able to handle some loud situations using the CA mics. A battery box does not amplify the signal coming into the mics. That's why if you try to record anything soft with no preamp the levels will be very low. If you are going to record anything acoustic you will need a good preamp. I'll brag on the SP preamp I have only because I've used it and know how well it works, but I do want a CA preamp eventually.