I must recommend these.
The first time I could actually hear bass with earplugs! Makes it even possible to listen to dub with these... The insulation from outside noise also helps a lot. I had to buy the sparkplugs for the second time today... the first ones broke down after heavy use at a sheet metal factory during the summer. Dull industrial work didn't feel so bad with SYL blasting... Anyway, I'm not usually raving about these kind of things, but i think the sparkplugs are worth a try.