My favorite picture here is of the delivery.  As for your 2 channel use of the SB16, I do agree that it could be overkill.  I have stereo SB3000's anchoring a pair of NHT 2.5I's.  I do have to back the SB's down a bit.  But what I did find sir is that my soundstage absolutely exploded with better information.   I was always okay with one sub ( I've had Veloydne F1500R and ULD 15), but when pairing them...…….  Well let's just say I had to eat my opinion about one being sufficient.