If i remember correctly, You mentioned that Your speaker blow up cause You "tweaked" some values to high, from "safe defaults" provided in hack thread. Maybe we just need to put values even lower? If not, I'm absolutely sure that stereo widening effect can be regained by just correctly mixing few different output gauges on alsamixer. Experiment, but don't put any higher than default value - it's better to gain little quieter effect, than blowing speaker