  We study two $1/N_c$ effects on the meson spectra by using the AdS/CFT
correspondence where the $1/N_c$ corrections from the chiral condensate and the
quark density are controlled by the gravitational backreaction of the massive
scalar field and U(1) gauge field respectively. The dual geometries with zero
and nonzero current quark masses are obtained numerically. We discuss meson
spectra and binding energy of heavy quarkonium with the subleading corrections
in the hard wall model.
