what amplifier do you have? Since you mentioned it in the original post? If it's a 4 channel and you are more inclined towards a surround setup, I'd suggest you focus on the speakers. A good set of components upfront and rear coaxials will give you a great surround sound. You might even have some cash left which I'd suggest you put into dampening the doors and rear shelf to isolate the cabin and increase the midbass punch
The other way is to get the front components and and sub powered through the amp and if you still want rear speakers, run them through the android unit. Chinese android units have crappy power so you can shift the fader more upfront. Another issue is that xplod subs aint really good with quality. you can try putting it in a sealed box but the bass wont be that accurate. I also doubt the chinese android unit would have a sub control setting for you to actually have control over the sub.
I'd suggest these but Infinity and JBL both make the same speakers under 1 brand. There are other options too so you can choose yourself. This is a great setup to begin with though.
Front components: Infnity Alpha 650c (~15k)
Rear coaxials: Infinity 6520 or Infinity 6930
Amplifier: Pioneer 6704 (~20k) but its a great small under-rated 4 channel amp
Sub: JBL CS1214 (~14k)
Prices have changed and may vary from shop to shop. But note a lot of shops also sell fake JBL, Pioneer, Infinity etc stuff claiming they are authentic. The shop mentioned above doesn't deal with that, the owner is a member here and he has installed some great setups. There are 1-2 shops in Lahore, Karachi etc which are recommended to new comers so they don't get ripped of and scammed
Happy buying and let us know what you end up getting
