Rather than color my review of the Alpine SPR 60C, 6-1/2" passive component speaker system with the emotions I am now experiencing, I will simply state the facts based on my experiences these past (2) months since my original install in my small performance SUV-
Original HU- Alpine CDA 117
Original front components- Alpine SPR-60C
Pioneer 4-channel amp.
Alpine coaxials for rear fill.
Decent small enclosure sub.
The speakers sounded OK after much tuning of the amp, tweeter settings, etc.
However there was absolutely no bass coming from the component woofers. All wiring was done correctly. In addition, there was an apparent midrange harshness, ringing, resonance that surfaced in lots of music. It was actually quite irritating to the point that I had wished I had just kept my factory install. I blamed the harshness on the Alpine tweeters and the lack of midbass on the fact that my doors were not yet sealed. One thing that was puzzling though- when the tweeter attenuation was used to try and reduce the tweeter harshness, the distortion became more apparent and grew worse with each attenuation setting, e.g. -2, -4 or -6db. In hindsight, this distortion is likely at the crossover point of the drivers and would likely not be affected by the attenuation.
So I replaced the Alpine tweeter with an aluminum dome Vifa tweet. I also sealed the doors and added more dynamat.
Still no midbass and the tweeter / midrange distortion was still there, if not even more obvious because of the aluminum dome tweeter that revealed the noise.
Next step- I thought that the Alpine receiver was the cause of the distortion. This was my first Alpine receiver and I had always previously owned Pioneer. I swapped it out for a Pioneer HU. It was definitely an improvement. I prefer the warmer sound of the Pioneer. However, the midrange distortion and ringing was still present, just not as much. I also swapped the Alpine woofer out for a Silver Flute wool cone driver. This is a nice woofer! After break in of about (2) weeks, the driver revealed very nice midbass.
I then replaced the aluminum dome Vifa with the ring radiator XT25 that many people love. At first, this seemed to help but upon further more extensive listening, the distortion and ringing became apparent yet I did like the SQ of the Vifa XT25.
So now I am convince that the issue of the distortion and ringing lies within the poor execution and quality of the Alpine passive crossover that came with the set. So I price some DIY crossover components based on third order low pass and high pass slopes at the best possible frequencies for the silver flute and vifa XT25 which is right about 3200 Hz. or so. The parts for the set of crossovers totaled about $110.00.
Enough already, I need a good well engineered set of passive components. My good friend loves JM Labs and is big into audiophile sound for the home. So he recommends Focal, which I had already thought about.
Done deal- Focal 165 V30s.
So the poor quality of the poor quality of the SPR 60C passive crossover ( I thought something must be up- the crossover enclosure is the size of 2 double A batteries, compared to the Focals crossover enclosure and most others which can approach the size of a small brick) cause me to-
1) Get rid of a perfectly nice Alpine CDA 117 receiver.
2) Replace the tweeter twice.
3) Lots of hours of labor and grief.
In addition, the woofer lacked bass- any bass- mid bass, low bass, high bass- ZERO.
Bottom line- The Alpine SPR 60C component speaker set is EASILY THE WORST SET OF SPEAKERS I HAVE EVER OWNED SINCE HAVING A STEREO IN MY FIRST CAR IN THE EARLY 80'S !!!!