Acoustic GW detectors in the 2010 timeframe

I consider the spectral sensitivities and bandwidths, in the standard quantum limit, of the narrowband spherical detectors, which would evolve from the present bar detectors and the wideband novel ʹdualʹ detectors that have been proposed recently. If appropriate advanced fabrication and read-out technologies are developed, both kinds of GW acoustic detectors would play a relevant role in the near-kHz frequency region.