The Bass Enhancement unit is a monolithic electronic hardware unit aimed especially for bass, we could double up this unit and make a stereo version but lets keep it simple for now and maybe add at a later date. There would be nothing wrong using the unit for the full spectrum this unit focus's on adding warmth, saturation and drive to low end frequencies, this makes bass sounds more thicker and fuller sounding.
There are 3 stages to this unit, the first being the Input stage, 2nd the transformer with bypass switch, then the 3rd being the filter and output stage. Each stage has its own unique job in maintaining stability and overall sound quality for the chosen input.
Below I will explain simply what each stages is intended for.