TMM(2.5) or TM 14L w/ MiniDSP

First off, thanks Tinitus, Dissi, and DumpTruck for clarifying some things in my last thread and sorry for creating a new thread, but I figured the title of the last thread no longer applied.

I'm still having a tough time pulling the trigger and committing on a setup with the following design constraints:

• 14L box mounted to the wall (yeah I know, reflections and all that but its the only place I have)
• Crossover W/ miniDSP
• No subwoofer, so I want bass extension to 40Hz
• Room is short and speaker is mounted high so I'd like a wide vertical dispersion towards the floor

Questions:

• Will a TM or TMM(2.5) give me better dispersion towards the floor?
• Do I want to mount the tweeter on the top or bottom for a cabinet mounted high?
• If I do a TMM (2.5) with a 4-channel (total) miniDSP crossover, I assume I will need to do the .5 crossover passively. I assume I just wire an inductor in series with the .5 woofer? Is this good enough or do I need a steeper slope? Wise mix of passive and active circuitry?
• When actively crossing over a tweeter, is it a good idea to wire in a capacitor in series in case the DSP dumps its software and sends a full range signal to the tweet?

I am guessing I have the following advantages and disadvantages to the two designs. Please feel free to correct as you see fit...

TM Advantages:

• Deeper bass response (Lower f3)
• Wider vertical dispersion?

TM Disadvantages:

• Lower total SPL to work with active EQ

TMM(2.5) Advantages:

• Higher total SPL to work with active EQ, which could help overcome reflections due to wall mounting
• 'Bigger' sound with more midbass and ability to EQ lower bass

TMM(2.5) Disadvantages

• More unpredictable vertical dispersion?
• Mixing active and passive crossovers (Maybe this isn't so bad?)
• Higher f3