Klang + ton Array Mini

Haven't posted in a long while, small children are a trip.
For my birthday present I'm going to build myself some speakers.

I really like these: Klang und ton Array Mini's. Unfortunately I can't really find much about them online aside from the original article/plans/diagram. No forum threads or anything deeper.

Two Q's (please bear in mind I'm a carpenter I can really do boxes but not circuits):

1: How do I (can I?) increase the impedance? 3 ohms will roast my old Yamaha receiver for sure. Ideally I'd like to pair them to a small passive subwoofer run off the B speaker posts on the same reciever eventually so 8 ohms would be clutch. Is this too complex of a modification?

2. Are these dumb? I like them for their size and ratios and aesthetic. I assume k+t knows what their doing and wouldn't publish a speaker that would sound rubbish. But nobody seems to have ever built them and posted about it.
 
"increase the impedance?" - this would require a complete redesign of the schematic; it could be possible using 2x 4 ohm WS100 in series, but would be less efficient

Edit: I found the schematic online; with series woofers you'd need to increase the value of L1, half the value of C2, and incease R2 & R3 to match sensitivities of the tweeter branches
 
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Ok... So it seems like the 3 ohm thing isn't the problem I had thought. So I'm just gonna order the things I think.

I will report back in many months once I have built them.

Thank-you for the advice and it's good to have that name Mr Barske in case I have some Q's.

Thanks again!