You bring up some very good and valid questions some that I personally asked Eric at Tekton about when I was looking at the double impacts and the answers I got from him have been proven to me that he was correct and not a bs artist,after I've had my pair for 4 months now and I have listened to them everyday and also I have done quite a bit of measuring as well.
I'm just a happy owner and I truly love the sound I'm getting and my knowledge of this unique design backup to me the sound I'm getting.
There is a few specs about this speaker that I would be willing to share on this thread or others,I'm not a professional reviewer by any means and It's not my place to broadcast specs and details.
I really like all of Nelson pass amps from my very first one which was the Threshold 400a to my Sit2 and F7 that I own today and I could tell you lots of detail about them but It's there again not my place.
Anyway here is a few details about specs of the Di speaker and I will let you make up your own mind.
1. All 7 tweeters are 4 ohm.
2. Center tweeter is a super tweeter playing 10k to 30k.
3. The six outer tweeters play down to 680 Hz.
4. The 2 mids play up to 2k
5. The 2 woofers are crossed at 250 Hz with a 2nd order crossover.
6. The true,in my listening room efficiency is 95.3 db with a 1 watt input at 1M distance playing the industry standard 1k frequency.
Some folks think I'm very biased or a fanboy and I'm ok with that I'm just trying to share actual real info and my opinion of any product that I either own or that I have heard.
Kenny.