Subwoofer

With the exception of Bo, pretty much nobody would use subs into the low mids as it isn't necessary and is simply not going to sound right. If you have very bass shy monitors you might put the subs up to 80hz or something but beyond that it gets weird (try it). Boo uses digital EQ to get whatever results his golden ears require so I imagine that's a key element of his take on what sounds right. Another note on driver "speed"…clearly, doped paper cones can be extremely light and sound amazing (new Wilsons anybody?) and the utter lack of understanding how drivers work is a hallmark of Bo's imaginary world.

Audio is all about comparing and creating the best endresult, it is that simple.

When 80hz or lower would give better results we would use it. But it is inferior, so you would be a fool to choose a lower endresult.

I had a client with a Wilson Audio Sasha. I sold them for him a few months ago. He was never happy with them. He didn't like the tweeters and he also didn't like the low freq. Even with the Momentum Stereo he found the low freq not tight and missed the layers he was looking for.

I like the sound both ways. Curiously, I blend the sub in and it sounds great. When I remove the sub, I like it...

i would make a poor reviewer!

Just added a 15 yrs old sub that was on my home theater that I am not using it any more to try out on Cary SLI-80 yesterday.    Wow, unbelievable the soundstage opened up a lot more with very big noticeable.  But the volume was very low and not happy with it so I took the sub out.  Somehow after I connected RCA to sub outputs on SLI-80, the volume was lower right away.  

To Kijanki  
You say you speakers go down to 30 Hz, how you now this?  You read the specification ?

What is level 30Hz ?    -6db or - 10db,   some manufacturer  of small  boxes is claiming  
to go down to 30hz, Don t be nut