Arnold,
GM is one of those off the cuff math whiz ala insta-enclosure ideas based on driver parameters (Fostex and Jordan, etc) that surprisingly sound good for those who built them. He's also a hardcore Altec Horns owner and all around nice guy (he has two alnico 515's in his bass bin that he rolls off naturally).
http://fullrangedriver.com/show_image.php?id=21
Renovating his living room (see ceiling).
Anyways, you are on the right track .. since the FR you have is actually a widerange PA driver (baka guitar, labas na labas ang vibrato ng strat ni SRV nyan
). So the 406+ 2459 + horn tweet in OB is just the perfect demonic swill
for musical ecstacy
Sir Mandy and Arnold,
Pwede nyo pa habol yan sa Nov Hifi Show sa DIY room....