Originally Posted by LTD02
hey, if you like them, then nothing else matters.
"If each driver has only 1mm of Xmax (they have more), 25 drivers x 1mm equals 25mm Xmax, right ?
Bore times stroke equals displacement, I am told."
let's take a look at the math.
one ids driver has 36.3 cm^2 surface area and moves up to 0.26 cm (2.6mm xmax one way).
36.2 cm^2 * 0.26 cm = 9.44 cm^3
9.44 cm^3 per driver * 25 drivers = 236 cm^3.
that is the swept volume, one way, at xmax, for the ids.
a jbl 2226h driver has 880 cm^2 surface area and moves up to 0.76 cm (7.6 mm xmax one way).
880 cm^2 * 0.76 cm = 668 cm^3.
therefore the volume displaced by a 15" driver 668 cm^3 is more than twice the volume displaced by the 25 smaller drivers in the ids 236 cm^3.
I had had and heard many speakers over the years, and will never forget when I first heard a good full range driver speaker. I heard the magic people who are fans of full range drivers talk about.
Some of us a bass freaks, some are volume queens, some are detail freaks, some are into imaging. Me, I am into the midrange, before all else. Sure, I like imaging and bass, and I have been known to crank Black Sabbath and Scorpions, from time to time. My monster Subs really "Hit", and I can turn my listening room into a dance club, at will.
I have had very few speakers that do not need a dedicated subwoofer. My old Electro Voice Interface D's, and my current Electro Voice Sentry 3's have little need of an external sub, for instance. But even the big Sentry III's only go down to 30 hz, and my Subs go even lower. So, for home theater, I add the subs.
I am only gonna ask the prototype line arrays to play down to 80 to 100 hz anyway. I have a pretty large room. Plus, all things being equal, I think if I take the bass out of them, they may sound even better ?
Here is what Roger says about the IDS 25
14. How can such little cones provide any bass, even with the equalizer?
It is true that these 3-1/2” drivers are very small compared to the 12” or 15” woofers that you are used to seeing in a system having good bass capability. You might think of the IDS-25 as a woofer made of 25 individual diaphragms all working together. Each one has an effective cone area of only 5.7 square inches. However, when combined together, the effective cone area of 142.5 square inches is equal to that of a sixteen-inch woofer and they couple to the surrounding air very nicely. The equalizer then provides the means to achieve a smooth and extended response for the deepest bass.
The large effective cone area of the IDS-25 not only delivers excellent bass but also effortless sound through the rest of the audio range and fills the room from top to bottom.