T-Spec V8-AK8 8 Gauge Amplifier Installation Kit closeout 4D means that it efficiently

4D means that it efficiently converts power into sound

the MRX300 features a USB port for playback and charging: and up to 64GB of storage for MP3 and WMA files: giving you plenty of storage for all your favorite tracks

LCD Display Tape

Optional PEQ provides 0dB to +18dB @ 45Hz

lowers distortion

T-Spec V8-AK8 8 Gauge Amplifier Installation Kit closeout 4D means that it efficiently17 V8GT 8 AWG OFC red multi strand power wire 3 V8GT 8 AWG OFC black multi strand ground wire 17 18 AWG OFC blue remote turn on wire 17 V8 noise rejecting twisted RCA cable with precision molded ends and split tip MINI ANL fuse holder with 40A fuse Nickel plated 8 AWG seamed crimp ring terminal with 8. 5mm hole and silver boot connected at battery end and black boot connected at ground 8 AWG spade terminals with silver and black boots for amp