It depends on what your track does.

Put a kick and a ride together in classic techno style. Get the volumes right so that its sounds "proper" to your ears.

Look at the spectrograph - usually the bass will be massively louder than the ride, but it will still sound balanced.

You can sometimes do things with the curve of spectrographs to make them look more flat, and compensate for the fact that bass has much more energy to it that treble. But you need to know what you're doing. I use the voxengo one, its helpful enough but can be misleading sometimes if its not set up properly. Or maybe I just don't know how to use it :)

Train your ears, trust your ears and use the spectrathingie to confirm or troubleshoot problems. Don't rely on the spectrathingie to tell you your mix is right, thats not what its there for and it can't really tell you that.

Ears Ears Ears - most important thing of all.
There's no substitute for training them, and it does take a lot of time to train the buggers. Still, all part of the fun.