You might want to check your mix in mono and set the bass level while listening in mono. (master fader interleave or from your audio card control panel so as not to change within sonar. My focusrite has a mono button for checking in mono.) I switch to mono to check volumes of vox, bass, things predominately mono. See if that helps.

Ok...Ill try that....what about the overall level.   It gets so quiet when I export I have to turn my computer to full volume just to begin to hear it

Try this: Select all your tracks and "Bounce to Track." This will create a new track in your project that represents your mix.
 
Solo it and listen to what it sounds like. It should sound like your mix, but lower in volume because your master fader will probably be down somewhat to accommodate the levels of all the tracks. If you turn the master up, the sound should be the same.
 
If the mixed sound is NOT the same, then there is something set wrong in the export dialog. If the sound IS the same, drag the clip with the mix to your desktop and play it back through something else (burn a CD or whatever) and report back on what happens.

If you're using Media Player for your exported audio, perhaps this will help:
http://forum.cakewalk.com/Solved-Another-Mixdown-Question-m2988843.aspx
 

To save everyone some reading in the above link:
 
"The problem was Windows Media Player all along. It had the "SRS WOW Effects" settings on. The track sounded exactly as intended when I took that setting off."
 
I second Craig's proposal to bounce everything to a track in SONAR, but choose Buses as the source, and select only the Master. Then set the output of that "Master Bounce" track direct to Main Outs, and A/B the live and bounced mix. You can also invert the phase of the Master Bounce track and it should null with the live mix, though unfrozen plugins that have random elements built-in can prevent perfect cancellation.
 
 

ThemBonez
I also need to clarify, when I listen on my computer its mostly the overall volume issue.  The overpowering bass occurs when I move to a cd and listen on my home or car stereo, as well as the volume issue.

The overpowering bass on other systems is a product of your mixing environment, not your equipment.  Well, minus your monitors, anyway.  As for the volume issue, I think there's something going on with your faders.  I'd do what others are suggesting.

I believe I have the bass thing handled, but still have issue with overall volume.  I did everything suggested and getting same result.  I import the exported wave so I can measure the db's.   When playing direct from the tracks the db floats between -3 and -6 db.   When I play the imported wave, it floats between -18 and -12.   All my faders are on 0.

Also, when I bounce the drum and bass tracks to a track, that tracks is also playing around -18 to -12 db.  While the original tracks are playing at around -3 to -6 db.   Here lies the problem.

This must be a routing problem, it's the only logical explanation.
 
Please list what tracks & busses you have in your project, how it's routed and also what sends you are using.

I had the drums routed to a drum bus and the bass routed to a music bus, but I changed it to be directly to the master and my quadcapture12 interface.   There are no sends.  I minimized everything so that I can isolate this issue.  No effects, no sends, no buses.   When I export to wave, like I said, its about 6-12db lower.   When I bounce the tracks to another track....even that bounced track is about 6-12db lower.