the cardboard bass isnt as loud as a normal Upright Bass,
i couldnt gig with LOUD instruments without the pickup.
I'm not sure why, or if it'll be possible to get more volume. I've learned quite a bit from other bassists offereing me their oppinions.
I've added a soft wood bar that is attached directly under the bridge and presses tightly up against the back of the cardboard bass body as to allow a flow of resonance to get sound off of the back.
It's an improvement, but still isnt as loud as an acoustic guitar.