If I wanted to extend the runtime of a Sonosax using only 9V internal batteries, could I power my mic with a PS-2 and run line-in to the Sax w/phantom turned off? I think this should work, but I couldn't find an instance where anyone had tried it. I thought of using pricey 9V lithiums, but I already have a cheap, long-term battery solution for my PS-2. Thanks.