  The spectrum of meson and diquark excitations of dense color neutral cold
quark matter is investigated in the framework of a 2-flavored
Nambu--Jona-Lasinio type model, including a quark $\mu$- and color $\mu_8$
chemical potential. It was found out that in the color superconducting (2SC)
phase, i.e. at $\mu>\mu_c=342$ MeV, $\mu_8$ aquires rather small values $\sim$
10 MeV in order to ensure the color neutrality. In this phase the $\pi$- and
$\sigma$ meson masses are evaluated around $\sim$ 330 MeV. The spectrum of
scalar diquarks in the color neutral 2SC phase consists of a heavy ($\rm
SU_c(2)$-singlet) resonance with mass $\sim$ 1100 MeV, four light diquarks with
mass $3|\mu_8|$, and one Nambu --Goldstone boson which is in accordance with
the Goldstone theorem. Moreover, in the 2SC phase there are five light stable
particles as well as a heavy resonance in the spectrum of pseudo-scalar
diquarks. In the color symmetric phase, i.e. for $\mu <\mu_c$, a mass splitting
of scalar diquarks and antidiquarks is shown to arise if $\mu\ne 0$, contrary
to the case of $\mu = 0$, where the masses of scalar antidiquarks and diquarks
are degenerate at the value $\sim$~700 MeV. If the coupling strength in the
pseudo-scalar diquark channel is the same as in the scalar diquark one (as for
QCD-inspired NJL models), then in the color symmetric phase pseudo-scalar
diquarks are not allowed to exist as stable particles.
