SPX-17PRO - Alpine 6.75" Type-X Pro Series Component Speaker System
These speakers are an impressive upgrade from type r and even type x ref. note that the tweeter dimensions are much larger than either, so cutting gets more extensive. The tweeters sound amazing from day one, but the woofers took a couple of months or more to really open up. Now the mid bass is quite good for speaker size, while initially it was tight but not powerful.  The crossovers are impressive and again take up a lot more room than typical, but can really help the tuning by adjusting for on/off axis a