Sorry, but exciters are not a substitute for high-fidelity loudspeakers.
That is all true, however, if you remember the OP of this thread he said: " I’m exploring my options for surface mounting speakers on front wall" I offered an inexpensive option within the parameters given. Although electrostatic flat speakers may produce better sound, from my experience, they are also far more sensitive to placement, therefore, the exciter method may be a happy medium.