Tim,
Your rig is very interesting. I cannot help but notice you are running a QSC power amp with an Alembic F2B preamp.
Ive used multple speaker cabinets on medium size gigs with great success. Seeing you rig - sort of confirms that - if you want big sound - you need either big cabinets - or more than two
Obivously this is your concert rig - and not your small gig rig. I am a fan of DE cabinets - although I do not own one; the tone from them are always right on point.
Tim, when you use the WT-550 head - which cabinets do you use with it?
Happy Thanksgiving to all...