I'm getting some weird results calibrating my new sub (SVS25-31cs) driven by PartsExpress 250W amp. This is in 6500 ft^3 room. Using the Avia sub balancing tones, with both reciever and amp volume maxed out, I can't get the sub to match the speaker level (speaker at 80 db) - its down about 3 db. But then with the internal reciever (Onkyo 696) level calibration, this max achievable level(but too-low level according to Avia) is 17 db too hot. I was expecting around 7db based on statements that the Onkyo sub tone is 10 db too low. Subjectively, the sub at this level sounds way to high. Any ideas on what's going on here? By the way - my rave on this sub will come soon. I can tell it will be pretty spectacular. But I'll withhold further comment until I get everything just right - Behringer BFD due to be delivered tomorrow!