I own an SRA505. As the pic above your last post shows, there are 5 knobs, none are stacked, all frequencies are set, in other words, non-adjustable.
People do tend to gut and replace Ibanez electronics. I still have my stock electronics but replaced my neck humbucker - the EMGHZ pups don't do it for me. I onlt replaced the neck because I don't like bridge pups, so I saved $100. The bass works fine, I usually leave it flat (no boost or cut) and eq at the amp.