[Cajundaddy]

Yes you can find them. I used to own a pair of Altec A7-500 that were rated to 35hz and classical music is one of the few places you will find "useful" music below 50 hz. I sometimes listen to Charles Ives and the organ passages are pretty amazing but... this represents about .00001% of music produced over the last 80 years. If this is your thing, you probably need those Arias.

My measure of deep bass these days is a kick drum. If I cannot hear a discernible difference between unfiltered down to 35hz and a signal limited with a HPF to 45hz then we will often go with the latter to clean up unwanted LF rumble that muddies the mix. We are currently working with a vintage Hammond B3 w/Leslie and we will probably keep as much bottom as she will produce for effect. Deep bass is always a tradeoff and getting room boundaries to play nice with a 27' audio wavelength becomes challenging.