Regarding Monster cables for bass:
I cannot confirm whether there is any truth to what I read years ago about Monster cables for bass, but what I read was, those cables were designed to remove some of the high end frequencies, fooling the user into thinking that those cables provided more bass.
Also, (and again, I cannot confirm this), but I recall reading that the 1/4" plugs that Monster was using were ever-so-slightly larger in diameter than what most other cable manufacturers were using, making it an uncomfortably tight fit in some 1/4" jacks.
This is going back 20 years ago or so, so maybe things have changed since then. I am only sharing what I recall reading back then. So please take that for what it's worth!