Summary: Note* This review is being written after 1 month of breaking the speakers in. Car: Honda Civic LX '03 Amplifier: Kicker 11ZX650.4 Head Unit: Sony MEX-BT4100P I have listed the above specs so that the main factors in the sound production can be compared to others. I am currently running the SPR-60C's in the front with the tweeters flush mounted unto the door. In addition, I am running the SPR-60's in my rear deck.
Summary: The tweeters went after two weeks. I installed them and the front right tweeter is already making cracking noises. I am running a stock radio with in door amps. This cracking shouldn't be happening. At first everything sounded great until the cracking happened. At low volumes the woofers sound very poor.
Conclusion: I just installed these in my 06 F150. They can can be made to fit with a little trimming of the door pockets and using the included adapters. I was running some Kicker coaxial's in the front and difference is amazing! With the Kickers I would get some listening fatigue after some time and these can stay cranking! The mid's are exactly what I had been longing for! With the others the tweeters seemed to be too harsh and drown out any mid bass I might have been getting.
Conclusion: MUST be used with an amplifier! Give them as much power as you want and they will take it. Im pushing 130 watts to each side and there is no distortion att all. The tweeters arent harsh or tinny if you set the crossover right and the vocals and midbass dont even get drowned out by 2 10" HCCAs!