Originally Posted by
Mike Caldwell
Hello
For the double 15 cabinet the JBL 2226 would be a good high power 15 speaker choice and assuming the cabinet was tuned for the E140 speakers the 2226 would drop in and work well. For true sub performance down into the 25hz area the tuning would need to be reworked. The JBL 2235 would be good choice for the double 15 sub but the cabinet would certainly need to be re tuned to use them. How big is the cabinet and how is it ported now. As for using the double 15 and your single 18 together as one sub woofer system it's generally not a good idea to use different driver types mixed together operating in the same frequency bands. A double 15 properly tuned and loaded sub would be better than a single 18 due to more cone area.
Mike Caldwell