I was dissapointed with my Intaride Evo speaker quality so I swapped one headset's speakers and soldered in a spare pair of Autocom's I had lying around which improved it a bit.
With the other headset, I cut off the Intaride speakers and soldered in a 3.5mm stereo socket into which I can plug my Etymotic ER6i ear buds, which are really good quality and double as ear plugs too so you dont need loads of volume going to waste.
Very easy mod to do - even with my appalling soldering skills!
Mike