Rarely do I find a commercial product that performs as well as the better professional products. It's kind of like comparing race car parts verses family car parts. Even if we're not talking about output levels, the quality of speaker build is generally better. Good pro gear has about 1/10th the distortion and better response curves too.Check out the specs of JBL Professional Series and TAD products and you'll see what I mean. Eminence is very good too.
The bottom line is performance is what motivates me when choosing components. If I found that I could get better parts from the carsound or home theater markets, then I'd use them instead. Nothing matches the dynamic range, low distortion and uniformity of response of good prosound components in a properly designed and implemented loudspeaker system, in my opinion.