if you want a good idea, scrap splX and go with something cheap and a good background...
Toxic
2x Toxic TSW100
Toxic 12" 1200 watt subwoofer
£88.91
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1x Toxic TX-1500N (to power both subs)
2 Channel Amps
1500 Watt 2 Channel Amplifier
£87.45
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1x Toxic TX-800N (power compontents & 6x9)
4 Channel Amps
800 watt 4 channel amplifier
£99
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and for your speakers, with the amp listed above you would need a set of door speakers and 6x9's with a greater peak power of 200w
Sorted