[quote name='project_c' timestamp='1504802731' post='3367465']
This may be slightly off topic but I have blamed lower back pain on certain basses in the recent past, and then I found that the actual cause of the pain was work stress combined with a lack of sleep. I'm not suggesting this is the case here, but for me physical and mental health has a huge impact on how my body feels. If i'm stressed and overworked I get all sorts of weird aches and pains. The joys of being self employed..
[/quote]I was also thinking that the cause might not be your bass. Your back doesn't necessarily get painful at the time it's being abused. Got any Trace Elliot gear?