A gig I do every now and then for one of my regular clients basically entails:
-1 Mic
-1 Mixer
-1 Powered speaker for the ~30-50 people in attendance
-1 Press mult for 10-15 cameras
-*1* battery. I use the Duracell 600W portable batteries to power my mixer and speaker. We do this because we're generally 300'+ of very non-negotiable (like streets) terrain away from AC power.
The battery puts a little bit of noise in the line and a Furman conditioning power strip or rack conditioner doesn't seem to do the trick. The noise isn't really noticeable through the speaker, but it obviously is to the press. So rather than using my Whirlwind passive mult (which requires a line level signal), I end up having to rent a powered mult so I can do Mic->Mult->PA by just stealing one of the output channels for the PA.
Obviously, I'd rather use my own gear if possible--it's preferable financially and logistically. Any advice on trying to get the noise out of the line and preserve the ability to get a line level signal to the mult? I know it's a battery issue because I use the other gear all the time, and it never has an issue indoors...