The reason the HE-400 has more score on fun is because they have a fuller sound, with a deeper sounding bass than the HE-4. The HE-4 is faster, and not as thick bodied. It's colder, and more dry sounding. I've mentioned this on the guide, so...yeah.
Anyways, don't bother with the HE-4 unless you have a power plant. Seriously, just don't bother if you're not using some truly powerful amplification. Nothing less than something like the Lyr. more would be better. That's how much they scale. The HE-400 sounds good off practically anything.
Ok thanks. I listen to rock and electronic, but some my favorite bands have female vocals. Someone told me the He-4 was best for rock, but I now see they need some serious horsepower to drive.