If you've search for Fosgate here you've already seen my comments. Got it in the '19 Forester Base (which lacks the dash corner speakers but is otherwise the same stock system), and it sounds well indeed. The kit is about a $400 item (list about $420), and in my case there was another $200 for the labor. So your $550 quote is a good price, considering. If you check the online parts stores, some also have the installation manual for it -- there's quite a bit of pulling the dashboard apart to get wires in. The kit consists of replacements for the front door speakers, and a digital signal processor/amp that sits under the passenger's seat. The DSP is tuned to the Forester. The midrange and treble is very clear, truly hi-fi in the vocal/lead instrument range, and percussion comes through with real punch. The bass is clean and goes low in the spectrum, but the doors just don't make that good a bass cabinet, so it's a bit thin. There's plenty of headroom at moderate volumes.
The DSP is very well tuned to the interior. The resulting system has a basic 3-band equalizer, but I find almost everything sounds by far best with that flat. If there were a way to add a subwoofer this would be a near-perfect system; but by all reports there's not, unfortunately. With Sirius/XM you're at the mercy of the lossy compression; but CDs sound rich indeed. I've been noticing details I'd missed listening to some of them in my living room, where I've got got a decent mostly-Emotiva middle-of-their-range hi-fi. It's not that the Fosgate is better fidelity -- it's not. But it's got enough clarity to hold my attention, and aside from the thinness on the bass end, there's no distortion. There's not enough bass for hip hop; but for rock and country and jazz it's sweet. And hell, I don't care about hip hop.
It's far better sound than the stock system in our '18 Outback. You might do better with custom equipment, if you found the right people to put it together. That was more trouble than I wanted though.
The DSP is very well tuned to the interior. The resulting system has a basic 3-band equalizer, but I find almost everything sounds by far best with that flat. If there were a way to add a subwoofer this would be a near-perfect system; but by all reports there's not, unfortunately. With Sirius/XM you're at the mercy of the lossy compression; but CDs sound rich indeed. I've been noticing details I'd missed listening to some of them in my living room, where I've got got a decent mostly-Emotiva middle-of-their-range hi-fi. It's not that the Fosgate is better fidelity -- it's not. But it's got enough clarity to hold my attention, and aside from the thinness on the bass end, there's no distortion. There's not enough bass for hip hop; but for rock and country and jazz it's sweet. And hell, I don't care about hip hop.
It's far better sound than the stock system in our '18 Outback. You might do better with custom equipment, if you found the right people to put it together. That was more trouble than I wanted though.