I have a 2015 honda fit. I had the OEM unit, going to a JBL MS-8, which went to a JBL mono amp, and a JBL 4 channel amp. I have a TC Epic 10, infinity references up front, nvx speakers in rear. My jbl amp is 100rms X 4, both 2 and 4 ohm stable.
With the OEM and MS-8, my speakers screamed...