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We present the concept of a sensitive AND broadband resonant massgravitational wave detector. A massive sphere is suspended inside a secondhollow one. Short, high-finesse Fabry-Perot optical cavities read out thedifferential displacements of the two spheres as their quadrupole modes areexcited. At cryogenic temperatures one approaches the Standard Quantum Limitfor broadband operation with reasonable choices for the cavity finesses and theintracavity light power. A molybdenum detector of overall size of 2 m, wouldreach spectral strain sensitivities of 2x10^-23/Sqrt{Hz} between 1000 Hz and3000 Hz.Comment: 4 pages, 3 figures. Changed content. To appear in Phys. Rev. Let

Wideband Dual Sphere Detector of Gravitational Waves