I found the Einklangs the outlier - unsurprisingly. They have the liveliest presentation, despite the treble rolloff, and of all the many whizzer-cone designs I’ve heard, they are by far the best-integrated. They really should have been marketed differently, because they are great in their own right, but didn’t really integrate into the range; a smaller 2-way would have made a better small-Direkt.
The Two-way Direkts are probably the best-integrated across the frequency range - which is surprising given the gulf in sizes between tweeter and mid-bass. Of all 3 speakers, they were also the biggest bargain new.
The Dreiklangs are my personal favourite because they cover the entire frequency range so very well, and near-seamlessly at that. They are surprisingly bass-light versus expectation - if you want ever-rumbling SFX, you’ll need a subwoofer, these just give you what’s on the recording, fast and tight.
The one thing all share in common is being a little harder to drive than represented - they’re sensitive, but flea-power stuff will never give you live-music volumes, the First Watt J2 can get slightly scratchy when I spend the whole evening easing the volume up to batshit levels… This may well save my hearing from lasting damage. They still go fucking loud.
The flipside is you can pair them with high-powered amps - I’ve used all of them with 250WPC monos and a 400WPC integrated, and they sound superb.
Heco dropped the ball with styling and marketing, and especially with uneven pricing, but they made speakers that are as good or better than much pricier kit.
Next step for me will be to foo-up the crossovers in the Dreiklangs.
You’re a Naughty Man.