Being old and with kids doesn't imply that you suddenly don't have a passion for clear audio. Middle aged guys were my best customers when I built setups, primarily because they knew what they wanted but they also had specific things they still needed their car do to (like haul cargo or kids.) For that reason I developed a taste for building stealth systems which I've become decent at designing and building.
To answer your question, I don't have a Mach system and the 08's didn't have it as an option (they mistakenly called it an "Audiophile" system instead), but generally speaking factory equipment will not have a crossover on the woofer at all. Instead they rely on the natural rolloff of the driver itself. The tweeter is crossed typically with a 6dB/oct passive capacitor, very basic. You are more than welcome to find out what rating that cap has and do the math to figure out its crossover point, but I'd have to estimate that most of them are 3-3.5k.
Ohm rating should be 4 all around, since we're talking a stock deck and nothing extravagant (there is no external amp for any speaker except the sub, which does have unique ohm ratings.)
Upgrading speakers will give you better clarity provided you deaden the doors some (so resonance doesn't overcome your new-found clarity), but your efficiency will be less on most any aftermarket speaker so be prepared for a lack of bass output and a lack of overall un-clipped volume. You don't get to have both unless you add more power.
To answer your question, I don't have a Mach system and the 08's didn't have it as an option (they mistakenly called it an "Audiophile" system instead), but generally speaking factory equipment will not have a crossover on the woofer at all. Instead they rely on the natural rolloff of the driver itself. The tweeter is crossed typically with a 6dB/oct passive capacitor, very basic. You are more than welcome to find out what rating that cap has and do the math to figure out its crossover point, but I'd have to estimate that most of them are 3-3.5k.
Ohm rating should be 4 all around, since we're talking a stock deck and nothing extravagant (there is no external amp for any speaker except the sub, which does have unique ohm ratings.)
Upgrading speakers will give you better clarity provided you deaden the doors some (so resonance doesn't overcome your new-found clarity), but your efficiency will be less on most any aftermarket speaker so be prepared for a lack of bass output and a lack of overall un-clipped volume. You don't get to have both unless you add more power.
