Originally Posted by mikeciccarelli
At around 10-12 feet from the sub I was getting around 105 db max with 1 15" but I really couldn't "hear" the bass.
Inverse square law says that a sub doing 117db at 3ft will do 105db at 10ft. Everytime you double the distance you have to subtract 6db. So going from 3 to 6ft is -6db (111db), going from 6 to 12ft is another -6db (105db).
Adding a second LMS-15 and a second EP4k would give you 108db, assuming zero loss.
I have 9 subs powered by two EP4k's and an iTech8k, and I average about 120db at an LP of ~10ft. (Closest subs are 3ft, farthest subs are 15ft.)
I figure that if I buy 3 FP10000Q's and add another 9 subs I should be able to squeak out about another 3-5db.
Physics is a whore.
On that note, you really need two types of subs: high excursion for the <50hz stuff and pro-style for the 50-200hz stuff.
One is good for simulating earthquakes, and the other for high-impact events.
Your graphs look fine, but isn't 60db a bit low for taking sweeps? My aging air conditioner is outputing 62db (I just measured it)
. Shouldn't it be at least 80db for better noise rejection?
The more distortion free the subs are, the quieter it will "appear" to sound, because "sound + noise" is less than just the "sound" by itself;
but your brain is telling you... but I spent all this extra money to get MORE!!!
Sometimes less is more... or is it?