I have to point out that while those railmaster speakers have more headroom (hence much less distortion) than the regals, they are noticeably lower in volume. The difference is like 3 and 4 on the volume setting of a CF which is quite a big difference.
I promptly went back to those regals. The only time I encountered distortion with regals is when I converted a track with too high of a volume for use with isaber. Never encountered distortion yet with any soundfonts with the exception of Episode II by Novastar. But Novastar already admitted that that font will be problematic with newer CF.