plugitin 5,000+ posts
She Bangs
If this amp is the same as the cactus 12k, which based off the images it is, then at MINIMUM i'd say it's good for 12k, if not more.
The opti series is very good stuff and usually conservatively rated.
Besides, i'd rather pay that much for an opti than for some banana and coffee bean filled amp that when it breaks takes a year to get fixed.
i agree