How to power 3 cabinets

I'm pretty dumb myself... but it looks to me that your amp (Mesa Walkabout)only has a 4 ohm output so you can only run 2 of those 8ohm cabs. Adding a 3rd brings the impedance down to 2.67 ohms. A Mesa WD800 amp would power your 3x12" cabs because it will go down to 2 ohms.
<my 2 cents>

 

What amp are we talkin about using with these 3 cabs?

 

What amp?

 

A pair of 2x10s would also give you the benefits of a tall stack and give you all the volume you need, but with two 8-ohm cabs you could use pretty much any amp you wanted.

 

1) Are they all 8 ohm cabs?

2) What are your tone goals? Do you like things squeaky clean? Or do you want a little bit of old school warmth or "hair" on the tone?

 

I just Googled "lightweight bass amps 2 ohm" and the first batch of hits were TB threads.

 

Any amp that is rated to run with a minimum 2 Ohm (or in your case specifically a minimum 2.67 Ohm) load. Many bass heads from a number of manufacturers are capable of doing this including (since you mentioned Mesa gear) the Mesa D-800, D-800+, WD-800, and TT-800.

 

I had a similar dream, to I paired two EA VL 108's with a Walter Woods MI/400/8 (400 watts at 8 ohms) that particular setup feedback while a VL 208 at 8 ohms did not. So there are advantages and disadvantages to paring two full range cabinets.

Just my take.

 

Need a 2ohm bass head..

 

Glad that got sorted out.

 

Genzler heads can run three cabinets down to 2.67 ohm. I have the Genzler equivalent of the Aguilar stack you mentioned...three vertically stacked Bass Array 12s. A modular dream.