Synergistic Research Black Box -

https://audiobacon.net/2018/06/20/synergistic-research-hfts-black-box-and-atmosphere-xl4/

Hi I am going through the above review.

But it will be nice if I can get more opinion from other users.

Thomas

I tried them in my system. They certainly work and impact the bass and if you have big problems they could be what you want. However they impart a certain tone to the sound, an artificial edge that I found grating. My room is heroically treated for bass management and room acoustics in general so in the context of a much more lively room they may work well

@ folkfreak

Thanks a lot for your valuable opinion.

My room is also  well treated and open so it is not very lively.

If it makes hard edge out of sound, it is not what I want.

The above review raved about it.

But his system is not quite same league as mine.