SET friendly speakers w/ slam?

The DB99 would be active I believe, so this is a solid state amp doing the bottom end... There are some other speakers that are passive and will work well with just as good of bass as actives, but need to find them.

Emerald Physics mentioned many times will need more power due to the open baffle and are also an active bi-amped system meaning needs processors and 4 channels or more of amplification, so just using them on an outright S.E.T amp is probably more trouble than its worth in my opinion to recommend them realistically..

I do however agree with all the Zu recommendations if you want to keep it very simple..
Also the New Zu Definition as stated above is a great choice and now comes in a 30 ohm version and 101 db efficient which can be driven by anything.