Head Unit:
JVC KD-X330BTS $85
Bluetooth
24-bit digital-to-analog converter
high-and low-pass filters
inputs: front USB 1.5A port, front auxiliary input
outputs: 4-channel preamp outputs (4-volt front, rear/sub)

Amp:
Pioneer GM-A4704 $99
4-channel
40 watts RMS x 4 at 4 ohms (65 watts RMS x 4 at 2 ohms)
130 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
CEA-2006 compliant
Class AB amp technology
variable high-pass (40-500 Hz, 12 dB/octave) and switchable low-pass (80 Hz, 12 dB/octave) filters on A channels
switchable high- and low-pass filters (80 Hz, 12 dB/octave) on B channels
preamp and speaker-level inputs
fuse rating: 30A x 1
10-gauge power and ground leads recommended — wiring and hardware not included with amplifier
12-1/16"W x 2-3/8"H x 8-1/2"D

Speakers:
JVC CS-DR520 $25
2-way car speakers
5-1/4" carbon mica woofer
cloth and rubber hybrid surround
1" PEI balanced dome polypropylene tweeter
power range: 2-40 watts RMS (260 watts peak power)
frequency response: 85-25,000 Hz
sensitivity: 88 dB

Subwoofer:
JL Audio 12WXv2 $100
12" 4-ohm subwoofer
polypropylene cone with foam surround
power range: 50-200 watts RMS
frequency response: 22-250 Hz
sensitivity: 87.17 dB
top-mount depth: 5-5/16"
sealed box volume: 1.375 cubic feet
ported box volume: 1.75 cubic feet