I tried the J&Ms's first, possibly better sound quality but they did not increase volumn , I took sound meter readings for comparison. The amp blew the JBL's away if your prepared to spend the money and time. As noted, I invested about $600 (I already had the wire) and about a day to make the changes including swaping the speakers out. This is a 4 channel amp peak rating around 180 watts per speaker. I have blown 5 Polks (rated to 170 watt) aready by turning the amp too high but if I can find speakers rated for 180-200 watts I can turn up my amp about 25% more. I can get it so loud you can hear it blocks away as can be attested by the people on the street turning around to see what is making all the noise.
I also added a compact Bass woofer in the frunk but I took it out recently for trip (it unplugs and is out in less than 5 minutes. The woofer complets the package, provide great bass. This added about $150 more for the bass package. I also has outputs for 2 more speakers so I have them mounted in the frunk as well. Not really useful until the hood is raised but wow, when parked its party time! lol.
From what I could find out, the stock radio puts out less than 30 watts so yes 2 ohms doubles it but not even close to an amp. With the amp I can run on the freeway, in traffic, and easily hear my tunes now . I run about 3/4's on the volumn scale but have to turn it down after a bit to avoid causing my ears to ring when I get off!, lol.
