I had the chance to have the little EV out with the Big EV and found something interesting also.
The little EV has a sizable amount of sound behind the book self speaker with no port in the rear. The port is in the front. The Big EV S15-3A has very little sound behind the speaker. Right now I can only attribute this to the size of the baffles. The little EV is a 6.5 and ST350A tweeter in a JBL 2600 cabnet. The S15-3A is roughly 2.5 feet by 3 feet by 18 inchs deep.