Plugging my bass (9v emg pups) straight into my power amp (Crown xti1000) gives me exactly the tone i want, but not quite enough signal to push the power amp to war volume. I much prefer this tone to using my Madamp tube pre, or my Ibanez head. Is there a simple (cheap!) bit of kit that can boost the guitar's signal to the amp without significantly colouring the tone? Maybe some sort of active DI box or such like? A high-end preamp is financially out of the question, and tbh i don't want anything but a slightly stronger signal. I've been trying to get to grips with voltage and impedance matching of inputs/outputs but now i'm more confused than ever... Any suggestions would be greatly appreciated!