I was pressed for time but wanted to do a quick comparison. To see if what I've been hearing between the 2 boxes showed up some in measurements.This was an informal listening level test comparing a Db IG4T to a Yorkville EF500p. I did 2 measurements. The first was with the Ig4t's limiters just starting to flash and the second was the Ef500p's limiters just starting to flash. I did a capture just as this happened to compare spl. Did a quick measurement mic/source alignment. Best phase was around 250hz.
I used my M32r's crossover function set at a 110hz low cut for this so both speakers were given the exact same signal. I used Smaart generator to give pink noise with I believe it has a 6 db crest factor. Because this is an extreme test I used a 12k high cut filter to go easy on the horns. (Why the extreme high's are rolled off. The 500p's have much less high frequency output) The 2 captures are overlap on each other just as they were at limit light for each. Blue is the IG4T. The horn's on the IG4T's have much better L/R coverage and spl than the 500p's and because the Low-Mid is much better sound wise they seem to be much louder in the room overall. I found when playing music after ( graphs and video's are going to be added ) what I noted live was the same in measurements overall Because the wider coverage broad band and still at the same SPL as the Yorkvilles on average I had to run the subs about 3-6 db's louder to keep up to the IG4T's. The Yorkvilles would tap out trying to fill this same room but the Db's had more to go for what we all thought was loud enough. For me this show's how the Total SPL is not the whole picture. Good coverage and better sound quality, even at just slightly louder volume over all in the room is much better than loud low quality sound.
I'll post pink noise and music captures in the replies to follow so please wait a bit for me to post them before any replies. Again this was informal and just for a quick comparison. It does show how they keep up with a 15/horn speaker.
Thanks!
Douglas R. Allen