I didn't based on the specs listed. I did by the sensitivity specs on each manufacturers page. JBLs 98 dB 1w/1m according to JBLs data sheet. JTRs are 100 dB 1w/1m according to the specs on their web page.
The key though is that when you use 2 horn loaded cabs together they get a 6dB boost. So instead of 100 dB sensitivity they actually now have 106 dB as a pair.
Using my not-so-trusty brain to figure out that 1000 watts and 106 dB sensitivity comes out to 136 dB. Silly me...there's 2 cabinets, so they actually take 2000 watts...that puts the calculations at 139 dB...sorry about the mistake...it's 4 am.
The JBLs can handle 3200 watts program power, but any only 98 dB sensitivity it comes out to approximately 132 ish dB. I didn't do the exact math, so maybe it's 133, but it's in that neighborhood, and when you take in to account power compression...let's just say that 3200 watts could cook you a pretty thick steak, but 2000 might just cook a hamburger. All that wonderful power from your amps just warms the insides of your speaker cabinets...look here:
http://sound.westhost.com/articles/pwr-vs-eff.htmedited for my bonehead forgetting that 2 growlers take 2000 watts