On a convolution series attached to a Siegel Hecke cusp form of degree 2

We prove that the "naive" convolution Dirichlet series D-2(s) attached to a degree 2 Siegel Hecke cusp form F, has a pole at s = 1. As an application, we write down the asymptotic formula for the partial sums of the squares of the eigenvalues of F with an explicit error term. Further, as a corollary, we are able to show that the abscissa of absolute convergence of the (normalized) spinor-zeta function attached to F is s = 1.