Here's my first audio upgrade. Existing HU is a SONY CDX-S2010. It has a built-in sub preout for subwoofer upgrade. It doesn't play CR cd's so I'm planning to upgrade it one day too...
The amp...a Kenwood KAC-6403. It's got a 500-watt maximum power output. I bridged the amp to 2-channel mode, just enough to drive the two front matching seps that I personally installed in the front speakers of my ride. The 2-way fuse block mounted above the amp is from GIS.
The seps...a Kenwood KFC-P507. It's a component speaker system comprising of a 20mm separate tweeter, a 130mm woofer, and a passive crossover network with adjustable tweeter dB roll-off.
Bought this bazooka sub in a garage sale for 10 bucks!. It's got an 8-inch long throw driver and an amp to drive it. It's from SAS Bazooka Subs. Coupling it with my seps is just enough to add some punch and rattle my side mirrors! Notice the Kenwood amp behind it.