Are there any current high end dipole speakers (dynamic)?

@mijostyn you got a point and I will investigate some more. Maybe I've been too lazy since my room is quite wide, and placing some mattress or similar on the sidewalls doesn't lead to big improvement. I should do the 'mirror trick' (its been years). Maybe I can locate the reflection point or zones even better by listening but I am not sure how to do it. I have always thought that the early reflection problem is largest in the treble, but recently I read someone claiming it gets larger downwards in frequency.

I tried my "DAAD test". I have DAAD acoustic devices, two columns ca 3 feet high, one side diffusion two sides absorption so you can turn/tune them to the room. I placed them with the absorption towards the speaker, on the line from the speakers to the first side wall reflection points. I found the reflection points with the help of my wife, holding a mirror.

Sonic result? No big improvement - I thought. But not clear. I only have only one pair of these columns, and when I move them to the sides, I missed the positive effect they have standing at the back of my speakers, tuning the reverberant sound down. So maybe I need another pair.

A big plus is that with DAADs and similar ’smart’ acoustic devices, you can do a lot to improve the sound, with small changes, and for a fairly low cost, direct in the analog / acoustic domain, before eventual digital corrections. I have a pure tube music system, and to my ears, the less digital and the less s-state electronics, the better.

My two Daads do not offer a "dramatic" improvement, my room is fairly big and good-sounding anyway - it is subtle, but it is there, and this pays off, over hours of listening.

Anyway - it is fascinating how sound is an evolving revolution.

Great HiFi is always an evolutionary product. Some issues require a degree of experimentation and you hardly ever get it right the first time around. Is old goats are worth listening to because we have already made most of the mistakes:-) It never stops either until you run out of money or die 

If your speakers are bipolar, you should consider therapy for them.