Ok, so as I get the same question all the time, here is the answer. The mod is a simple unscrew the old ones and rescrew the new ones, that's all. The difference is so huge, that you'll ask yourself is it still the same amp ? Way far better, powerfuller and preciser bass. A better definition all across the bandwidth which will be wider and way more headroom. It's a "winning on all sides" easy mod, but don't forget to respect the speakers polarity. You can even disconnect totally t