The Moonrock (really, unfortunately named) upgrade is only $
60 now shipped including PayPal or Visa/Mastercard fees.
So, I went for it. Based on the sizable better achieved by dumping 10 lbs of shot in the bottom on my Linaeum floorstanders, this was worth a shot for $60 for my Linaeum bookshelf units. The bookshelves already play louder and deeper than the floorstanders as it has an 8" woofer (rather than a 6.5" woofer). My bookshelfs have the port located very close to the bottom of the cabinet, front mounted, so it's likely to achieve the effect Paul describes for his TAD-803.
Hell, I've pee'ed away a whole lot more than $60 on dumber tweeks over time...at least this is somewhat proven
