After hearing these on a display at my local shop, Cartronix in Valparaiso, Indiana, I had to try them for myself. I bought and installed these in my car a few weeks back and feel that I have listened to them enough to give a fair review. Car is a 2014 Chevy Cruze. Mids are in stock locations in the doors. Doors have been sealed up and heavily deadened. Tweeters are in custom a-pillars and are facing towards opposite headrest. May not be the best for these but I just swapped out my old speakers for these without doing much else. Previous set up was Hybrid L6se carbon mids with Seas Prestige tweeters.
I am running the Sinfonis passive using the crossovers that came with them. They are being powered by a new LP2250. Head unit is Alpine 9987. I usually have a bit one for processing but I am re-doing the trunk so that has not been in the car.
Initially the tweeters were very bright and I had to turn higher frequencies down on the head unit as well as use the lowest setting for the tweeters on the passives. That may be just my car though as I have had similar results with almost every set up I've had. After very minor adjustments, I was amazed at how smooth the mids were and how well the played the lower frequencies. I have them crossed over at 50 hz with a 12db slope. I tried 40 hz and while the speaker still performed effortlessly, it was such a small difference in sound that I figured it wasn't worth the extra abuse when I like to play it loud. With the Hybrids they would bottom out playing down to 40 hz. I was mostly impressed by how good this set sounded even at high volumes and with very little tuning. When I get my processor back in, I would love to try running this set active and cross the tweeter over higher than the 2,500 hz setting of the passive.
For one of the lower lines of Sinfoni, this set is nothing short of amazing. Smooth, detailed, and durable. If these perform this well, I would love to try out the Maetosos and couldn't even imagine the Grandiosos.