Beh*Ring*er Preamps
You might be able to get away with the B*Ringer preamp if you had a very very nice mic. They make the top end grainy and the low end muddy. Sometimes the mids even get honky.
Or you might be able to get away with the 990 witha nice preamp.
Those two multiplied leaves a high and low end of mush. I've worked with the 990, and it actually sounds OK through my API 312 preamps. It also sounds decent to analog tape, cuz tape is rolling off somewhere around 15kHz.
My advice to maximize the setup you got is:
Sing a whole passage.
1) Go to the waveform editor and go to:
Analyze -> Show Frequency Analysis
Make sure the vocals are selected, then hit 'Scan.' You can also choose different scanning methods, try them out.
You are looking for a pretty much flat frequency response. Don't go nuts with your EQ, just a bump here and there oughtta do it.
Maybe roll of the bass -3dB below 85Hz. Roll up above 5KHz for 'airy' sounds. Experiment with different EQ settings.
2) Add some compression.
I usually hit about 3:1 and take make sure the threshold is @-9dB lower than the peak audio. See what sounds good for you.
3) Delay/Reverb - - -
Experiment with your reverbs, delays, and chorus. Depending on the voice, usually a touch of delay or chorus combined with a bit o' reverb does the trick.
4) Make sure your room sounds OK
Don't sing in a crappy room. Yes, you can hear the room even through a MXL 990 and a B*Ringer preamp.
5) Don't give up
You'd be suprised at the sounds you can get through consumer level equipment if you push it just the right way.