6 channel preamplifier and buffer module.

The project is to provide an improved output section replacement of a commercial digital crossover (audio DSP). The heart of the system is a buffered differential amplifier followed by a gain stage control (+/- 6dB). To avoid the loss of signal resolution dictated by the digital volume control, I preferred to control the level of the 6 channels analogically. It's for this reason that I have realized the second PCB (the smaller one) that simply acts as buffer for the analog volume control. Thanks to pcbway for excellent pcb realization!