In reply to:
BTW, I don't think any of us are saying that a bigger / better amp won't make ANY difference, just that you will probably see a small, subtle improvement from the new amp versus a huge, honkin' improvement from the new sub
Enjoy !!
On the contrary I found that smaller power amps with dedicated circuitry, quality parts like short paths and high power reserves on the power supply, minimal components within give the best presentation.
For example a Creek 5350SE 85w@8ohms or the CEC 3300 amp 60w@8ohms class A or Exposure 2010 50w@8ohms or Musical Fidelity A300 150w@8ohms can present a sound with more detail, better headroom and better soundstage than my Bryston 4B 250w@8ohms. I sold my Bryston and would pick up any of the amps I mentioned which also is much cheaper than the Bryston. Actually my older Bryston 3B 125w@8ohms sounded better than my Bryston 4B.