Any truth to the rumor that how you position a projection TV in a room (N,E,S,W) can affect the image quality?
(From: Jeroen Stessen (Jeroen.Stessen@philips.com).) Yes, it is true. It makes a difference whether you talk about a front or rear projector. Front projectors are expensive and critical enough that they will be converged after installation, so that takes care of any convergence errors. Purity errors are of course no issue with 3 separate CRTs… Rear projectors are converged in the factory, the customer does only the static convergence (4 pots) after he has decided which direction the set will face. This takes care of problems due to the horizontal component of the earth agnetic field. In a rear projector the CRTs are mounted almost vertically. The vertical component of the earth magnetic field causes a rotation error. Normally this is not an issue because that component does not depend on the orientation of the set and it is more or less constant over the entire continent. It makes a biiiig difference though if you manufacture PTVs in Belgium and then export them to Australia… That
