Wayne Parham Messages: 18752 Registered: January 2001
Illuminati (33rd Degree)
Short answer, no. There is no drop-in replacement that is as good.
If you're in a hurry, I might suggest looking for used 2226 drivers. One of the nice things about JBL is a reconed speaker is 100% as good as new, provided you use a genuine OEM recone kit.
The driver that is closest in performance and quality is probably the Acoustic Elegance TD15M, which is an excellent part. But it would require a crossover redesign, as has been discussed here in the past. It isn't a drop-in replacement for the JBL 2226 in the four π loudspeaker and the lead time is no better, so I'm not really on board with taking that approach.
I know it is difficult to wait, but the truth is that whether you plan on getting the top-of-the-line upgraded three π or four π loudspeakers, you should probably plan on a six month lead time.