Thank you, Mr. Acepaul.
Have you tried any of the recordings I've cited or the "Irene" scene in Blackhawk Down with the twin VTF-15H Mk2? What have you tried that goes below 10 Hz?
The price of the VTF-15H Mk2 increased $40 overnight from Jan 22 to Jan 23. Not a good sign. Also, this model is seven years old. There'll probably be a Mk3 one of these days, and I wouldn't want to get stuck with an obsolete model.