I noticed my 612 only goes down to 480p and not 480i. Does that mean it will only downconvert to 480p? Would that explain why I think the SD PQ with my 622 is better? The 612 isn't real bad but I notice a really faint screen shudder"Silght shaking" Very Slight. And I've never notice this before on my 622 when it was hooked up in my living room? HD PQ is perfect. Anyone else notice anything like this?