Mine were amazing with a PSE studio IV. Any slightly warm 100 watt amp should do fine. The threshold 400A is one of my all time favorites. However, it is very old and when they have any problems at all, it is a disaster to fix.
You could look at Anthem over the Proceed. I'd also look at Sunfire.
You could look at Anthem over the Proceed. I'd also look at Sunfire.