Sweet little cab - the small footprint cab with big tone. Finally got around to pulling my E120 from my Avatar 1X12 Cube and moving it into its new home. Fascinating how each cab impacts the overall rig's sound. I like them both, the Avatar is louder and "mid-ier," the SSP more scooped, sweeter, and "Jerry-er." Lighter, too, so I deem it a win-win. I'll be using it at a jam tomorrow afternoon, looking forward to experiencing the tones there, too.
The more I work with these types of rigs, the more I think the cab needs to be minimal. In avatar vintage cab, there is just too much wood, and it effects the tone of the speaker. I am running a K130 (I had a D130 in it) in a simple, light, pine 1/3 open back cab... and it sound much better. The next step is to try with out the other 2/3rds. I'm thinking four simple sides plus the baffle is key to getting that tone from these JBL's.