^I used to quad track but man it's a ton of work and not really sure if it's worth it in the end for a less dynamic sound. But it's all personal preference. You could get a massive sound just double tracking. Tracking left side with a guitar and the right side with a different guitar is a good idea, but not completely necessary. I usually deal with my filter in my DAW. High pass anyways from 75-150hz and then low pass anywhere from 8khz-12khz.