macc wrote:I'm probably not, it's true
Like I said, he talks a whole load of crap.... Eeerrrrrr, I mean, I don't understand him sometimes and it's all my fault

balls-deep innit, innit
so basically what i mean comes down to the sense of control that compression gives a sound. It's not just harmonic overdrive, like from an 1176-- super-low bass is such a huge-energy thing that its character can really be changed by this stuff.
OK say you've got a simple sinewave, the default in a sampler, etc. Let that run, essentially unprocessed in your tune, as the real low-down weight of the song. In a club it'll feel really full, maybe even 'warm' depending on the line it's playing and the rest of song

But no matter what, it takes a bit for a 40hz sine to get up and running, the part can't really be all that rhyhtmic,and what you'll be left with is this ensconscing bass sound. Kode 9 likened it to being in the womb-- it surrounds you, it's soft, it's full. The actual wavelength of a low sine is HUGE, measureable in dozens of feet, and you can see the speakers move-- big motions, but smooth. It fills in the sonic spaces of everything else.
Now. Take the same sine wave and a add a good amount of compression and makeup gain. Compress for tone, sure, but you want a pretty transparent comp, maybe something LA2A-ish or a good plug. Compress like 10db off of your sub, keeping the attack and release slow so as to not induce really obvious distortion, and bring the gain back up. sounds similar, right?
IME, that kind of control creates an energy in the bass that's a lot more aggressive because it's a lot more consistent. Yes, harmonically you're probably shaving off some of the roundness of the actual square wave and introducing modulations that render it closer to a square, but watch big speakers playing a compressed sub-- the movement's different, it's all out, then looks frozen, then back. The roundness of the sound is less prevalent but the sound feels much more up-front- it's less ethereal, less enveloping, maybe a bit flatter, and more in-your-face.
TBH we're talking psycho-acoustics here and my experience may be very different from yours. But time and time again, in testing tunes on the road, i've noticed this. It's another tool in your arsenal as a hybrid artist/engineer, and another part your vocabulary in how you affect the listner and dancers.
and then there's buss compression...