Meatier bass, better extended yet controlled treble and improved soundstage are exactly the improvements I heard with O2. You are lacking synergy with your DAC. Try SMSL Idea with O2, and forget about the "recessed" mids. Idea makes the mids sound "thicker", which results in a less recessed presentation. Also - tuning foams will have a similar effect on the mids, and you'll be able to dial in exactly how much of this effect you want. Tuning Pro 82 with easy mods The foams do not cancel the need for Idea though - they will not give you the full magical sound of Idea+O2. They can be an temporary solution until you buy Idea, and you can still try tuning Pro 82 even after getting the full combo. We all hear differently, and have different sound preferences, so easily tuning Pro 82 is always an advantage, regardless of the DAC/Amp used. Absolutely not! 6.5x would cause clipping with a 2VRMS DAC. Sabaj DA3 sounds great, but is too unstable. I'll give it a few more day before making a final decision on it. So far, it looks like it will have to go back.