Greetings Bassheads, As a Brit residing in the U.S. I am looking for advice on purchasing a sub in the $400 range. I see many comments in the sub forum about house shaking results, how low can you go ? This is all well and good, and enjoyable, but I'm looking for a sub with a tight, crisp sound. I'm concerned that many of the subs in the U.S. market are designed for maximum bass and offer little finesse or articulate, detailed presentation. Any thoughts, suggestions. Many thanks.