Dirty Weekend is a model they offer randomly a few times a year in very limited numbers for a weekend.... then to make them an OMEN MKII there is a clarity cap, internal wire, and extra bracing upgrade (which these have). Doing it that way saves around 1,000.00USD. It's just that the dirty weekend's sell out so fast (usually within a few hours) that its often easier to buy the much pricier OMEN MKII badged speakers that are always available.