Astro---The 511B works and sounds fine used down to 500. In fact IMO it's the 2nd best horn I've ever used and I've used lots of them: Edgars, EVs, JBLs, Martinellis, McCauleys, PAudios. The best sounding horns I've used were tarfilled Altec multicells, 1005s.So yeah, damp the 511s and use them and forget about it, you'll be done, only one thing sounds better than a 902 on a 511 - a 288 on a 1005. :-)