This is a passive version of the MH75-34-A and may be used in a bi-amped system with the low frequency cabinets. The passive crossover is within the cabinet and the MF/HF part of the system will typically be driven by one 350w amplifier giving approximately 3dB less headroom than the active version. It will therefore only be used in medium sized rooms with a mix position of up to 6m from the monitor system.