Quote:
mgboy wrote:
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If you're building a PA rig, it's probably decent. As a hometheater sub, would you be happy with an -3db point of 30hz and -18db @ 20hz? Did you look at PE's suggested design document?
This driver's a perfect example of my comments about power handling specs. The voice coil on this thing can probably easily dissipate the spec'd 500-700 watts all day long. However, put it in the 7.5 ft^3 box tuned to 33hz recommended by PE and you exceed Xmax with 300 watts around 50hz. A bigger box and lower tuning get you a
slightly better looking response curve (for HT), but excursion limited power drops below 200 watts in the upper 30/low 40hz area. Since performance is really about output and not how much power you have to feed it...above 30hz this thing is actually quite substantial, as you'd want/expect from a PA/sound reinforcement driver.
It's not just Xmax that's the problem, all of theT/S parameters work together to shape the frequency response and output...as they said in college, the proof is left as an exercise for the reader.
As several of us have already asked...what are you objectives and constraints for this project. An 8 ohms driver that handles 500 watts by itself is a meaningless requirement.
-Brent