"Sub-bass is a term used to describe audible sounds below 90Hz - sound in the range below this (under 16-17Hz) would be termed infrasound. Sound systems often feature a subwoofer that is dedicated solely to amplifying sounds in the lower bass and sub-bass range."
Source : Wikipedia
So the idea is to have the sub going up to ~90Hz. The exact frequency it should be cut at depend on the kick's frequency.
Let's say you HP your kick at 100Hz, then the sub should be LPed at 100Hz so they compliment each other without clashing.
There are several ways of creating a sub, here are the most common:
1 - using a unique waveform (sine, saw, square or triangle) will give you a nice linear sub.
NB : You don't need to filter out a sine wave as it doesn't have overtones.
2 - using detuned waveforms : take 2 identical waves (sine, saw, square or triangle) and detune them - let's say -.25 / +.25 semitone.
This will produce a phase effect and give movement to your sub but it'll also cause large volume amplitude and you'll need to compress it after filtering.
Great Massive tutorial by Subfocus here
3 - using a 808 kick : you don't have a TR-808? Grab that pack!
You can find more tips about mixing your kick n sub in the Random bass tips thread.jobbanaught wrote:An easy option to get a powerful subbass is to take a 808 kick sample, put it in your favorite sampler and loop a single cycle of the waverform somewhere in the middle of the sample. The 808 kick is made of a sine and some additional white noise. The sine gives your sub that rattling low end pressure, and the noise adds overtones/grittiness = instant badass subbass!
