Just a few notes i have taken recently that have increased my bass sound.
Understand the 5 main areas of the audio spectrum
You don't really want 2 sounds fighting for the same spot, so the next thing too think about is instrumentation.
The Kick and the Bass share the same frequencies, so there are a few things you can do to help them share the same space, without causing too much conflict and phase issues.
The first thing to do, is tune your kick drum to the scale you are playing your bass at. So if you are playing a bass-line in C Major, make sure your kick drums fundamental frequency is not outside of the C Major scale. You can see what fundamental frequency your kick drum is by using a spectrum analyser, such a the free spectrum analyser by Blue Cat Audio, and observing the highest peak. Next you can use a plug-in that alters the pitch of a note, to change it to the closest note that is in the scale, or find another kick drum sample.
Next, you may want to EQ out some frequencies for each sound.
High Cut the Bass at 30hz
High Cut the Kick at 70hz
Low Cut the Bass at around 600hz
The rest is down to warmth, if you have a warm sounding bass, then take out the frequencies between 100-300 of the kick drum, or vice versa.
Next you can side-chain your Kick Drum to the Bass, so that the attack transient of the Kick Drum forces the Bass to dip down in volume slightly. This way, the punch of the Kick, won't be conflicting with the depth of the Bass. To put side-chain compression simply...
Send the kick to an aux channel.
Mute that aux channel.
Put a compressor onto the bass.
Enable the compressors side-chain, and set it to the aux channel the kick is being sent too.
Now as you increase the threshold of the compressor, the bass will dip down when the kick is being played.
By increasing the ratio, knee and threshold, it will dip harder, and by changing the envelope settings (Attack/Release) it will react faster or slower.
Now your Kick and Bass are working along side each other, you can "glue" the two instruments together using Bus Compression. Simply set the output of both instruments to a bus, then compress the signal using some medium settings, then adjust to taste.
Medium settings would only reduce the signal by 2-4db, and have a gain make-up of 2-4db as well.