The Amphion ONE 18 is a passive two-way studio monitor offering excellent sound properties to create a better mix. In addition to a 6.5" woofer and fast-response titanium tweeter, this monitor features Corian Waveguides and a sealed case with a passive radiator. Together, the components deliver a clear listening experience to facilitate a clear and balanced mix. This two-way speaker operates reliably in the frequency range of 45Hz-20000Hz (+/- 3dB), whilst the clean frequency crossover is set at 1.6 kHz. An additional subwoofer is therefore not absolutely necessary.