I have a recent model First Sound Presence Deluxe II, so I can't offer a first hand response to your direct question, but having spoken with Emmanuel on several occasions, I have to assume whatever upgrade he was offering not only improved sonics...at least to a degree that his highly discerning ears could detect...but was also fairly priced. I seem to recall the upgrade was for models made before February 2003, and had something to do with an adjustment to the grounding. Double check with Emmanuel for the details.
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