As stated, my head unit is the RES 130S. Not the greatest, but looks to be a great base from which to build a system around...one that passers by in parking lots won't suspect anything worth stealing is in the vehicle. I've built a number of systems using stock head units as the base...and they've all sounded really nice.
Anyway, my 2016 Compass Sport came with this base system with full range speakers in the doors only. While they had some bass, the sound was quite muddy. I picked up 2 pairs of Alpine SPJ-691C3
on sale for $39.99 per pair, along with 2 pair of Metra 72-6514
speaker harnesses for $6.24 each. After adding the harnesses to the speakers, my son and I had all four speakers replaced in under 15 minutes. It was an extremely simple swap...one that was a huge improvement over the stock full range speakers.
I've been running the speakers through their paces, playing a large number of different genres of music, and they sound great.
I do plan on adding an amplifier in the future, as soon as I figure out how I'm going to get it done. I've been looking at the Kicker 400.4 amplifier, thinking it would be great for my needs, so long as I can find a place to stow it so it's not out in the open, or in the way elsewhere. I'll also eventually add an 8" or 10" sub to the back, once I decide on a plan of attack.
If anyone is looking for a good set of speakers to replace what's in the doors now, the speakers I listed above are as near perfect fits as you can get.