i used to have problems with subsonic popping and not sounding good.

because it was too loud, i always have my 404 full blast .,

this is what i do .

turn my sampler down a few notches when im tuning the subsonic .

then resample the note . then turn my sampler back up and turn the bass sample down to around 70 or 80 anything more is way way to much unless your going really deep then you gotta boost it a bit for it to be audible.

any way you should eq it to and you might have to turn it down again.

you gotta turn it down a shit load for it to sound good .