Agree but I wouldn't be hard on anyone about it. I was quite surprised when I first tried a crossover with my bass, even though I've been mucking around with xovers as an amateur HiFi guy for years.+1. Most of what's going on with the bass is above 100 Hz, not below. If you had a setup sophisticated enough to hear only the below 100 Hz content, including a true brick wall LP filter, you'd be hard pressed to even tell the note you're playing below 80 Hz, because nearly all of the information that defines pitch and timbre is above 80 Hz. That applies to all instruments, not just stringed instruments.