Canopy speakers are 2.6". And it appears they are glued onto the housing.
Inside speakers are 5.5. I have 6" weather proof ones I plug in on the inside and the sound was 10x better just holding it in my hand.
Looks like there is a sub out on the head unit. Only 4 speakers (2 in 2 out) with an A/B combo switch built in.
I have to figure out how to get the 6" speakers wired if I decide to use those outside.
20150728_181716 by
RoyBelluomini, on Flickr
20150728_182615 by
RoyBelluomini, on Flickr
20150728_183438 by
RoyBelluomini, on Flickr