Ive noticed a trend on here lately, it seems for any tonal issue someone is having, there is someone to say "get a hpf". Ive even seen people state on here that they're an essential piece of gear for any bass rig. Now I don't need anyone to explain HPF to me, Ive used HP, LP and BP filters in all sorts of contexts before. My question is to the folks who say they are a must have, what did people do before these units were as available as they are today? Like Jaco, McCartney, Jamerson, [insert famous bassist here] got along just fine without them...or did they?