Speaker treatment, true or bullshit?

Speaker treatment, true or bullshit?
More about EnABL here:
Listening impressions & techniques

CSS EL70eN. Click for a bigger picture.

Technical discussion

I have yet to find my personal opinion. I own both treated and un-treated CSS EL70 but I haven't done an A/B comparison. The initial differences though were that the treated one sounded slightly warmer than the un-treated driver did.
And then one should not forget the fact that the treated drivers bought from Planet10-hifi are matched pairs.

41Hz AMP15-PS XP

Yesterday I started working on my second amplifier, the AMP15-PS XP from www.41Hz.com

I continued today and this is how much I've done so far. Pretty much all of the tiny components are done but there are some questionmarks which I will have to solve by consulting some friends. And I will have to wind the toroid inductors somehow too.

Click for a larger picture