Someone knows technical data about subwoofer A2118200002?
 

I have one w211 post-resstyling. It not have subwoofer, and I just change the Mercedes A20, by one android oem unit. I want to use the hole for the subwoofer... or with teh original mercedes speaker "A2118200002" or with any other subwoofer slim, I saw some partners recommend - JBL MS-10SD4 SLIM, or TS-SW2502S4...

My questions :

-anyone knows the technical data about the Mercedes speaker A211 820 000 2? ohms? wat rms? I supposed it is 4 ohms, because it have 4 pins, but I read around here, others speakers are 8 ohms inside the car... and about wats rms I'm complete lost...

-One of these normal subwoofer slims, will work fine without box? Everyone tell me dont make free-air subwoofer system...

I am looking too MTX Audio FPR10-4...

anyone could help me?