Dual SpectrumLogo Design Contest Logo Design Contest Contests / Dual Spectrum Dual Spectrum has selected their winning logo design. For $275 they received 79 designs from 11 different designers from around the world. Find out how LogoTournament works How LogoTournament works Contest Entries by cezar.grafica Return to Contest Return to Contest Withdrawn New #13 Withdrawn New #12 Discussion No comments yet.