The 7k.2 references that the original spec was similar to the 5.5 inasmuch as they had 4 x 75W drivers. The .2 upgrade was to 4 x 100W drivers.

TAS: Meridian DSP7000 Digital Loudspeaker Check out spec at the end of the article, released in 2004.

vs

Meridian DSP7000 Datasheet showing the increased wattage.

However, if I'm wrong, I stand corrected.

DSP8000SEU, DSP5200HC, DSP33, DSW1500, 808v5, 861v4, WiiM Pro+, Panasonic 55" Plasma, DMP-BDT700 Blu-ray,
MECOOL MEon1, Russ Andrews Signature Power Block, UltraFuses, SuperFuses, Kimber Signature PS Interfaces.
Prior: DSP7000.2, DSP6000.2, DSP5000.2, DSP5000.2HC, 508.24, 568.2, 596, G98DH & G68D.
Jaguar F-Type; Meridian 770W Surround System