The main question is what is the purpose of the buffers for Hypex Class D amplfiers. The simple answer is the input impedance of the HYpex Class D modules is quite low making it impossible for most pre-amplfiers to drive it. The buffers increase the input impedance and add extra 12-14 dB gain.

NC500 modules completely depend on the external buffer. NCX500 comes with a built in buffer stage which can be bypassed.

RCVTech is working on developing customized buffers in order to achieve the maximum performance from NC500 modules and giving more OPAMP options for NCX500 modules.

The module currently available for sale is based on JRC MUSES02. The MUSES02 is a dual bipolar input high quality audio operational amplifier, which is optimized for high-end audio and professional audio applications with advanced circuitry and layout, unique material and assembled technology by
skilled-craftwork.

This buffer model uses high performance Hypex HxR series voltage regulators.

As mentioned above this buffer supports both Hypex NC500 and NCX500 modules. NC500 require regulated 12V inputs to drive the modulator stage. NCX500 comes with its own HxRs which requires 15V to 25V inputs. RCVTech buffer has two jumpers J1 and J2 which need to be set for either NC500 or NCX500 mode of operation.

This model has three year warranty and free shipment.