I bought my Panasonic Plasma 42" HD back in December. For the 1st three months I stuck with my old SD TIVO DVR. I was a bit upset with the TV in that it had depth of black problems when the scene was dark; the blacks seemed to "pool" and fluctuate. Since I put in my HR20 last month the problem as disappeared. Does the HR20 delever a higher quality signal to the TV, or is it maybe because I’m using an HDMI connection now.