I'm going to rely on the cumulative expertise on subwoofers from you good people. Here's my situation. Rotel PreAmp (RC-972) Rotel Amp (RB-981) Vantas DPA-S50 Processor/Amp Vienna Acoustics Bach Speakers I'm looking to purchase a sub to augment my current system. I would like the sub to be musical, as 80% of my audio enjoyment is music. The catch is I'm not willing to spend over $600. I've read good things about the Adire Audio Rava, and the Hsu VTF-2. Are there better recommendations, and which of these two would be the preference for music listening? Thanks!