O-Line is capable of surprisingly high output for its size, even though it uses small, direct radiators rather than compression drivers to produce high frequencies. High output is possible because there are five HF devices in each module – resulting in an effective HF voice coil diameter of 3 inches (75mm) with a corresponding increase in power handling. This is important, since it is the HF section in a line array that has the most demanded of it, due to increased air absorption at high frequencies.