after recording for a year with just an sm58 (and no pre), i recently bought a new condenser mic. instead of just buying a phantom power adapter for it (which i initially wanted) the salesperson convinced me to get a basic preamp for a few more bucks. as i record mostly acoustic stuff, i'm really concerned with adding extra noise - which is why is wanted just an phantom power adapter - anyway, i was repeatedly told no, it's not really that noisy. my question is - how can you tell if a preamp is making noise, or if it's just doing it's job really well and the mic is super sensitive and picking up room noise? oh, i should add that there are moments when i can pick up radio station signals, albeit faint and staticky even with the gain turned all the way down. the pre is an apex model. i'm thinking of trying out the behringer ultragain pre, but i know some of their products are notoriously noisy, although in their product description they claim it has "very low noise" any thoughts/advice? thanks everyone.