I have Quad 12LS and am flabbergasted at the level of detail,transparency,soundstaging,dynamics, and bass...they have a very "open" presentation...with a "sweet spot" that simply fills the room...I am also using NAD amplification and have not experienced any of the issues mentioned above...NAD might not have the esoteric name or garnish the best looking amp category...but their amps are their "bread n butter" so to say...the only change I would consider would be tubes...just for the record...I auditioned the Studio 20...and many others...including Spendor,Sonus Faber,Revel,etc...the Quads are a steal...