Hello, I recently ordered a used JCM800 Model 1580 Bass Cabinet. The seller's photos show it with one 18 inch Celestion G18Q-400 speaker. I've learned that they were made in the 1980s-90s, and came in mutliple speaker configurations. Mine is the 1x18. I'm assuming the cab originally came with the G18Q-400?
Would really love to know:
1. the performance specs of the G18Q speaker (Celestion.com didn't have any info)
2. whether the round port cut in the baffle of the cab is original.
See picture below. Thanks!