For some time, Higher-Order Ambisonics is a research topic in reproducing three-dimensional sound fields. Among others objectives, research aims at sound field reproduction over a large listening area. For prediction and simulation of a sound field the so-called energy vector (rE-vector) is a commonly used tool. At the central listening position, the energy vector provides good results for predicting position and width of a phantom sources. However, at off-center listening positions, the performance of the energy vector becomes worse. This project work compares different extensions of the energy vector model. The extensions try to include time and level differences, as well as the precedence effect in dependence of the listening position. Simulations investigate three existing loudspeaker arrangements (IEM CUBE, IEM mAmbA and György-Ligeti-Saal) for Ambisonic playback of 1st to 5th order and calculate the extended energy vectors for discrete points within the whole listening area. The resulting localization accuracy of the extended energy vectors at off-center listening positions can be compared to further predict areas with sufficient localization accuracy.