The performance WOULD definitely be different, you can't exactly copy an item EXACTLY as in 100%, can you? And the price really very much reflects it's quality of parts used.

if it uses good component then why it is so cheap ? 

Bro i am from kch as well but now residing in KL

Well regarding fake JL it is easy to tell them apart if you have listen to the real ones before. Basically fake ones my experience is normally the JL 12 w3 v1 and 12 w3 v2.
Characteristic is that its power handling not as high as the real one and its loses abit of the trademark tight and solid bass JL is famous for. It tends to sound abit lose and boomy abit.

But just a note the testing we did was we even send it to the local distributer to tell them apart. Exterior wise is almost 100 % identical. except the rubber at the side of the woofer will fade after a while. The only way to see the difference sad to say is in the VOICE coil meaning you need to take it out to see its fake . the fake ones the coil is smaller and less wire coils.

Hope that helps.

BTW my friend in kch also drives a EK9 with carbon hood. you might have seen him. he got quite a decent sound system. maybe he could help you out

Lanzar woofer ar, not enough soft for me....!

Feel you play SPL more..!

my Blaupunkt player has this setting "X-bass" not sure what it is. Anyone?

normal will need to set it under 100Hz
depends on the sub itself

l,m from Kuching too and l,m using single Pioneer 12 inch sub pair with Blaupunkt 2 channels class D amp. So far l,m ok with it.  As l know, Pioneer Sub can only be classified as mid-end. hehe.