Thanks for the responses. I have purchase the REL R218 and I am currently auditioning it. It might be too early to comment on its performance but so far I am really enjoying how it is sounding. The bass is extremely clean and articulate for it size. I was very easy to seamlessly integrate with my speakers. However, with the sub I notice a few flaws I am somewhat disappointed. First, the R218 has a class D amp rated or 250 watts where as the STF-2 is rated at 200 watts. As far as gain level, I had to max out the gain on the REL to get at least acceptable level and this was used for both low and high level(speakon high level cable). With the STF-2, all I have need to set just less then half ways. This might not be a fair comparison since one is a sealed and the other ported. Second issue is that the REL for me does not go as deep and as the Hsu does. Both subs integrate well in my system and perform well but I felt the REL lacking impact with certain music. It does however sound tight, natural and articulate and this is great but the Hsu does have better impact.
@m-db To answer your question, mostly yes. It was measured at the listening position mostly and other parts of the room. All measurements are done in real time and delayed to compensate latency.
