- A (global) determinantal representation of projective hypersurface X ⊂ P n is a matrix whose entries are linear forms in homogeneous coordinates and whose determinant defines the hypersurface. We study the properties of such representations for singular (possibly reducible or non-reduced) hypersurfaces. In particular, we obtain the decomposability criteria for determinantal representations of globally reducible hypersurfaces. Further, we classify the determinantal representations in terms of the corresponding kernel sheaves on X . Finally, we extend the results to the case of symmetric/self-adjoint representations, with implications to hyperbolic polynomials and the generalized Lax conjecture.