Soundstream Technologies HRU. 2 - Manual (Page 5)

Harmonic Bass Alignment™ The 2nd and 3rd order harmonic peaks are critically
aligned to fundamental peaks at low frequencies. This produces tighter, more
accurate bass reproduction.
Output Clipping Indicators indicate clipping on the output stage of the amplifier.
Monitoring the clipping indicators allows the user to achieve maximum Sound
Pressure Level without clipping the amplifier.
Dynamically Optimized power Grid™ Power grid is evenly distributed between
primary and secondary power supplies, providing greater dynamics and improved
RF filtering.
Chassisink™ All transistors are ideally located and sandwiched between the
circuit board and the heatsink to provide cool efficient amplifier operation.
Differentially Balanced RCA Input eliminates ground loop related noise in the
audio.
Continuously Variable Crossover Network : 12dB/octave for the highpass
section and 24dB/octave for the lowpass section.
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Flexible Input Level Control allow 300mV to 5V input sensitivity.