What Do You Think . . . and How Does It Work?

I plead guilty. I bait heaudio into unwinnable arguments. I have assured him I’ll let him win one sometime, just to keep him in the game. I have to have my fun, too.

And like a fly to ..... here he is.  A normal response would be, "I hope they are not talking about me", but the narcissist and the bully always want to be the center of attention.

Don’t be so hard on yourself. 

Duke, very good of you to take the high road. You are a good man and above this nonsense.

I have built the Plutos, LXminis, and the 521-4s. Love them! The Plutos & Lxminis will "disappear" in the room. The tweeters for the Plutos are getting hard to find (I understand) but Madisound will have them if anyone does, also the complete kits. The LXminis are better, but use an electronic crossover and four channels of amplification, and so are more expensive to build. A subwoofer is a nice addition, but not absolutely necessary. People who haven't built them or heard them scoff; don't believe nonsense from uninformed and inexperienced naysayers.You are going to stuff the plastic pipes with absorbent materials (or old sweaters) and they don't ring. You can even build a subwoofer using the cardboard tubes used to make concrete columns. Be sure to build the recommended crossovers for the Plutos as they tame a peak around 10k.
The only negative is that they produce a small "sound front" (as do all small speakers) but the upward facing woofers get their sound spread out by the tweeter tubes and sound much bigger than they look. They are super cost effective! Build them! Do it! They are very easy to build.