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So one of y'all recommend me a good sampler or compilation of dub reggae, esp. if it sounds like that one I linked to. I always like this kind of music when I hear it, and I know nada about it.
Also, there are about a million cheap, no-frills 3-CD Trojan box sets. I can't say I've looked closely at the dub ones, but they seem to be pretty decent.
I have all of the Trojan dub sets, they're good. If memory serves, Vol. 1 and the Rarities are faves. Keep in mind that most of those Trojan sets aren't dub. Arkology is probably the most important dub release. And it's soo freaking good (although not all instrumentals). Just getting that will school you so much, mainly because the guy was just everywhere for the most important period. The Blood & Fire Dubwise stuff is real good too.
Also, I highly, highly recommend Alpha & Omega's Sound System Dub. It's sort of a "best of" for them. It also reminds me of the page you linked to. Here's a sample. I have a ton more recommendations, but I'll leave it at that for now...