Swift Dzire audio enhancement

destructor

Beginner
I am looking to enhance my car audio system and currently i have company fitted alpine HU & 4 speakers.
I am planning to add amplifier and a sub woofer to enhance the sound quality. I am working on a specific budget and below are my set of configuration selected. Could you guys evaluate and let me know, if the items selected are decent and work to each others capacity.
My objective is to get good sound output with good bass. Currently, i get a distorted sound.

Amplifier:
GROUND ZERO, GROUND ZERO - 4 CHANNEL AMPLIFIER - IRIDIUM SERIES GZIA 4115HPX http://m.snapdeal.com/product/page/1686261385?utm_source=ios_copylink&viewinapp=1

Sub:
JBL, JBL - CS1215B - 12 inch Subwoofer Box Enclosure (1100 W) http://m.snapdeal.com/product/page/257870?utm_source=ios_copylink&viewinapp=1

Wiring kit: Which one is better?
Kicker, Kicker - DCK8 - 8 Guage Amplifier Kit http://m.snapdeal.com/product/page/1207108416?utm_source=ios_copylink&viewinapp=1

OR

Konnects, Konnects 4 Gauge Heavy Amplifier Wiring Kit With 2 To 4 Channel Convertor http://m.snapdeal.com/product/page/1803697596?utm_source=ios_copylink&viewinapp=1
 
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