Sir your HeadUnit seems to be lack of RCA output!!!
But it can be solve by attaching a pioneer RD-SR520 RCA adapter!!!!It can be connected with the wires of front and rear speakers!!!
Your sub is Pioneer 307d4 sub!!!!Sub is very good!!!Which amp u r using with it???
It is currently wired @ 8ohm!!!U can wired it @2ohm!!!!But first see your amp that it have any guts to bear the load of the sub!!!
Why u dont like basstube???For which problem u are not liking it???
Space problem????Without basstube the sub is like a car without engine!!!!
If u want to know that this box is good for sub then u can measure the dimensions of the basstube and also measure L-port length and bend!!!!!Then show it here and see what suggestions given by audio experts!!!!
Hope it helps,
Regardz
Talha!!!