Originally Posted by MKtheater
The new drivers have the most x-max, highest displacement and although I am running them 5 dBs hot they seem to be much stronger or louder than the others at 10 dBs hot with things like power cords getting knocked out of the wall outlets in the next room.
Originally Posted by dominguez1
Thanks mk. This ^^^ is exactly what I was referring to. Spl reads the same, but it feels a lot stronger.
So now that this Acoustical Energy theory is out there regarding Tactile Feedback, perhaps it explains the above and potentially why others have said high xmax drivers 'feel/sound' more visceral and deeper. MK, with his many setups, has said his latest most xmax drivers have the best ULF as compared to his other setups.
I'm going to throw out an analogy to help think through this more that I'm sure will get shot down...but what the heck.
Assume you have two sealed 14x18 rooms.
- Room A has 20 18in diameter holes in the wall
- Room B has 5 18in diameter holes in the wall
Water pours through the holes in both rooms so that after some time, both rooms are entirely filled with water at the same time.
If you stand in the middle of the room during this process, Room B will have much stronger "water jets" through the 5 holes, compared to the 20 holes in Room B. In fact, Room Bs water jet may knock you down because of how strong they are.
- The water in this example is sound.
- The volume of water is SPL. During the test, the rooms will be filled with the same sound at the same rates (amplitude is the same).
- The holes are 18in drivers, with the rate being analogous to the Xmax. In this example, 5 18in drivers' xmax of Room B is equivalent to the 20 drivers in Room A.
- The water force coming out of the holes, is the acoustic energy. There is more force (acoustic energy) coming from the 5 holes (18in drivers) in Room B, as compared to the 20 holes (18in drivers) in Room A, but in both situations, the volume of water at any given time is the same (same SPL).
Does this analogy hold any water (pun intended) ? Could there be more acoustic energy in high xmax drivers as compared to lower xmax drivers in multiples? Remember, SPL is not necessarily equivalent to acoustic energy.
EDIT: In reality, the room would be filled in milliseconds if it were sound, and the 20 subs in Room A would sum to the same SPL as the 4 subs in Room B. The point of the analogy (and my theory) is to illustrate that the 4 subs in Room B need more acoustic energy (accomplished by a larger xmax) to reach the same SPL as the 20 drivers in Room A. Because the acoustic energy is more concentrated in Room B, it pervades the room more and has more impact, and perhaps why high xmax drivers 'feel' stronger.
Edited by dominguez1 - 1/5/14 at 6:28am