Big John wrote:I think some of the frequencies on the bass amp take some distance to develop or at least that is what I have been told

I've found this to be the single most important thing about getting a good bass sound in the studio. The lower the frequency, the longer the sound wave takes to reach a pressure apex when travelling from the source. If you have the room to do it, try taking the D112 and pulling it back from the source a bit until you start to hear a little more of what you want. Then take the NT5 and close mic the amp to get more of the "growl" and once you're at the board, check your phase, and you can mix and match them to taste.

The RE-20 is also one of my first choices for bass. If you continue having the same problems, be sure to keep an eye out for one. They are very reasonably priced used. Plus they look like Darth Vader's cock. You can't lose!

If you're using 2 mikes be VERY careful of phase, it can sound amazingly weird on bass if you get it wrong. I've heard some engineers actually use it positively to comb filter certain mids but this is seriously advanced and dicey stuff.

The question I can't believe no one's asked so far is what bass and amp are you using and how's the technique?

If the set up is poor you can use any mic you want and it'll still sound like shit. If you have a great bass and a crappy amp just DI the bass, something like a sansamp box is great for this but if you don't have one a regular DI box coupled with an amp sim, (even a software one) can beat recording with a crappy amp.

If the amp is good then pick just one mic. I don't know what kind of music you're recording but if the bass is to be more of a feature then start with the 414, condensors tend to get more detail on the string sound. If you're looking for it to "RAWK" then try the D112 again but maybe try driving the amp or something (gain on the amp, lowish gain on a guitar drive pedal, driving input on a tube compressor too hard etc) to get a bit of character and definition on there, don't go too far or you'll loose those very qualities.

Oh, and EQ questions.

If you're not getting enough definition from the D112 look at the EQ.

100hz and below can make your bass sound deeper but in a rock recording they're not the ones you want to be boosting, they take up too much energy and don't add much in the way of clarity. Instead try boosting around 200hz for warmth, 1khz for prescence and 2.5 for the sound of the strings.

These frequencies will sound nasty on there own but should help your bass cut through.

Of course, the same applies for bass as for all instruments, don't reach for the EQ automatically, try changing the amp sound, the amp, the bass etc first.

good luck