Not much can be done here until they have some breakin time, but with the 3" long ports there's quite a bit of midbass. This is great for people who lsiten to classic rock and want a kickass speaker, but I listen mostly to jazz and classical plus some indie artists and prefer a lighter touch. I replaced the 3" ports with 5" ones, and with these the speakers sound a bit midbass shy. I suspect the right length lies somewhere between 3" and 5" but I don't plan to do any more experimenting until they have 50 hours or so on them. Anybody who builds these should order four ports so they'll have an extra pair to experiment with.