I know it's been a while but I have tested 2 different prototype 4" midrange drivers and they both sounded great although I noticed that the speaker I'm currently testing has less mid bass but sounds a lot more cleaner and gets pretty damn loud.
I have been talking and getting some help from someone who is very well known in the car audio world. I won't put his name out there yet but most of u guys who are really into the non mainstream car audio companies know who he is and know his products are very well better than most of these mainstream companies out here, for example JL Audio and kicker.
*TEAM SKAR AUDIO*
* ST Coilovers * VOSSEN VVS078 SG painted lip & satin black center * Matte black kidney grill * gloss black vinyl roof