How does your room sound?

I have used a U87 about 10-15 feet from the amp.

Fake reverb doesn't sound like fake reverb when used correctly. Utilizing an extremely short decay & no pre-delay is really all that's necessary to create a nice stereo ambience. Booming bass is dependent upon the rooms resonance & reflections. So you have a huge studio to do that in ? no ? Then your ambient room mics will sound like a lousy bedroom. My favorite sound. Use the software reverb.

In November I'm going to vote with Al Gore's rhythm
Ms. Remy Ann David

Have you considered an ambient roomy?

Do it Wobble style: Aim the amp at a wall (or a large baffle), mic it and the room.

[quote=bobbo]i've got some condensers and dynamics, i'm generally a mic the cab up close kinda guy, but i want a amb sound for this session i'm workin on, and i don't want to use fake reverb.

The fact is you can do both. Close mic with your usual set-up and experiment with room mics/distance/mono/stereo/dynamic/condenser to your hearts content. Record all your different sources to seperate tracks to keep as many options open as possible.
You don't say what bass cab you are using but be aware that some cabs throw the sound further than others. The old Marshall Sound Bouncer bass cabs sounded woolly and mushy from just in front but 20 feet out into the audience the sound was glorious! Therefore it pays to wander about in front of the cab whilst playing in order to find the sweet spot.
If your big roomy bass sound is driving the track then it's probably worth building the mix around it.
Of course you may end up fighting with the guitarist and drummer!
Have fun.