So was looking at many upgrading speakers of the Roadster over the years. Focals looked like my speaker of choice, found a local audio shop (Lotts Audio of Santa Cruz) who did a priceless installation of a Roadster with an 8 way install of the Focals. They went with 5 1/4" for the rears and put tweeters in the rear upper speaker housings. Looked good. I had a Roadster that came with the full non sub / audio tweeter Blaupunkt system. Stopped off at Lotts Audio today and met the person who did the 8-way install on the earlier Roadster. Told him I was looking for more bass and would go 5 1/4 in the rear, looking for speaker rings really. He said don't do that, stick with the 4" and go for these JL Audio 2 way speakers. They were $109 per set. He compared them to the Focals and the sounded great in comparison. He said the Focals were designed with a Subwoofer in mind, these were not. I asked about installing door tweeters, and he said they were not needed nor designed to be in place with these speakers. I took pics, the JL's are taller, as you can see. The rears I didn't think I could mount them. They bottom out not like the Blaupunkts. However everything bolted down nicely when I screwed the rears down. Clean like factory. As for the sound, they sound awesome. I actually had to put the fader favorable to the front by one notch for an ideal sound perspective / bass. And yes they thump! I'm not into cutting, adding, hacking, or modifying things that don't need that. So for myself, looking at this, consulting your well known audio expert is prime whom you trust. For those in the Bay Area check out Lotts. The JL speakers I purchased were the JL TR400-CXi series.