I'm thinking about upgrading the stock speakers for my 13 STI sporttech, came with Pioneer X9310BT HU and the front speaker are the Pioneer TSA-1684R, and the rear are Subaru stock. It seems lots of people recommend Alpine SPS-610C for the front and Alpine SPS510 for the rear, does that sound like a good combo, or simply leave the front and just upgrade the rear? also does anyone know where can I get the speaker wiring adapters and the spacers locally in YEG??