I EQed the bass today using my AudioSmile modded Behringer DEQ2496. It has an internal pink noise generator. Used RTA in AudioTools on an iPad with a calibrated MiniDSP microphone. Only lowered the 1/3 octave bands below 250 Hz to get pretty much a flat response with the midrange octaves. Then put on some music that had bass lines with which I was familiar. It sounded like the bass had nearly disappeared!! So, I reduced the EQ cuts by about 1/2 and replayed the same tunes. Much better this time.