I ordered in may 2012 a Kia Sorento 2.2 AT 4x4 EX Premium (I think in UK is KX-3) with options :
-back-up camera
-bluetooh
-navi
-start button
Price :39.002 Euro . It arrived in 24.08.2012 . In the contract is written that it has center speaker , subwoofer and external amp. (like a Premium car) , so it has 8 speakers . I discovered that it has only 6 speakers and no ext. amp. I spoke to Kia Romania and they took my car for a week and retrofited with center speaker , subwoofer and external amp.When I got my car back the sound was even worst : I have eco in my car . Why ? Becouse the smart guys that instaled the missing parts , connected the center speaker and the subwoofer to the external amplifier and let the original 6 speaker connected to navi. After I made some investigation I told them that they should change the navi too . The reason ? The navi that has external amp. is with can-bus and no internal amplifier . They say there's no such thing . Meanwhile I became a Kia navi "specialist ".
So I needed this information becouse at this trim and price the car should have ext.amp.
@mbutkus. Thank you for infos.You're very kind.Believe me , I know how a subwoofer or an amplifier looks like. I'm an telecom and A/V specialist with over 25 years of experience .
If you ever need information about Navi or audio wires , connections , etc. be free to ask me . If I can I will happily answer you.
When you have time read this :
http://www.kia-forums.com/2011-2013-xm-sorento-forum/83407-navi-witson-w2-c041.html
Keep in touch.