Classic “670” In a Convenient 500 Series Module The Heritage Audio Grandchild 670 Vari-MU 500 Series stereo tube limiter/compressor distills the sonics and performance of an iconic American dynamics processor into an affordable and convenient 500 Series module. The Grandchild 670 benefits from Heritage Audio's extensive experience in building sophisticated 500 Series modules and the years of R&D that went into its rackmount stablemates, the Herchild 670 and 660. Like the Herchild models, the Grandchild 670 delivers smooth, creamy, and natural-sounding dynamics control while adding warmth, depth, weight, and character to any program material. Driven by two new-old-stock mil-spec 6BA6 tubes per channel and fortified by three custom-wound big-iron transformers, the Grandchild 670 gives you the sought-after sonics and program-dependent behavioral characteristics of a coveted classic, along with modern precision, premium components, and robust build quality that will serve you reliably for many years to come.Versatile, great-sounding Vari-MU dynamics control