Its useless for audio applications. It adds nothing to the music except maybe psychological effects and plain scaryness.
But if you competently extend the bass, by definition you've made the group delay better lower, to put it clumsily.
Did anyone look at that "fan" from eminent? Its a joke if you ask me. $12,900 for a fan thats probably like 1' in diameter!
And they say recordings have infrasonic material in them below 10hz...
I've also heard that below 10hz becomes audible at over 120db.... has anyone here experienced 10hz at 120db in a house? You wont hear the 10hz... you'll hear rattles upon rattles upon rattles upon rattles. Ummm your walls would have cracks, pictures will fall. The neighbors would suffer the SAME effects!
Its useless for audio applications. It adds nothing to the music except maybe psychological effects and plain scaryness. For 12grand get the parthenon and at least you'd have something cool to look at!
I hate hearing infrasonic output to DC.... There is no DC pressure... DC means DIRECT CURRENT! CURRENT is electrical, not acoustical. DP (direct pressure) would be a much more intellegent thing to say
Adding a sub with response below 20Hz made quite a difference in my control room and living room, I agree with all you say.I have had the Eminent Technology TRW-17 Rotary subwoofer for over 2 years and it is awesome. Contrary to what you say, it has benefits for well recorded classical music and pipe organ, synthesizers.
Movies have a lot of content below 20 hz and with this rotary subwoofer it adds greatly to the excitement and realism. I can easily hear 10 hz and lower with this sub without shaking the house apart. Until one experiences this rotary subwoofer, making assumptions about it is wrong.
Adding a sub with response below 20Hz made quite a difference in my control room and living room, I agree with all you say.
Does the the fan output go through some sort of acoustic low pass filter?
Does the fan have a "direction", moving air through the the plenum and room, or is it a positive/negative modulation without a general direction?
What is the dB level of the fan when no LF content is present ?