Sandberg California II TM2 MBKB

I loved the bass shape and color the finishing is so good the neck is perfect every thing is fine except the sound is a bit low comparing to any bass I have the sound power is low on both single coils and Humbuckers I don't know what is the reason even I changed the battery I said may be it's from battery but unfortunately the result was the same so what I did I raised the amp volume more than a half to get a reasonable sound I don't know how the quality control of Sandberg missed that issue other than that the bass is light weight and the wood the color and hardwhere are stunning the quality one the sound is perfect but the sound power is a little low .