by Owen » Fri Feb 24, 2012 2:18 am
With any of the early R5x models, R50/52/53, you're limited to 13 cm speakers in the front, and 6x9's in the rear. You can buy adapter pods to convert the front 13cm to 16.5cm which is the optimum size for fitting decent components in the doors. If you want those pods, BlueZed has a set for sale in our classifieds forum.
Brand wise, JBL are okay, but IMHO they're cleverly marketed to sound like JL who are audio market leaders, so you don't quiet get what you're expecting from them. In magazine reviews recently, two brands that surprised me by getting good reviews were Vibe, and Fusion. Personally, I've always used Alpines for speakers myself, their quality is superb and can take an unmerciful pounding.
To get the best result, I'd fit a headunit with a crossover in the car, let the head unit only send mid and high frequencies to the factory speaker locations, and I'd then fit a slimline subwooder under one of the seats to handle the low end.