The ECM (Electric Circuit Modeling) technology is the result of the Yamaha longtime experience in digital signal processing. It combines a realistic tube amplifier sound (based on virtual modeling) with advanced programming and MIDI control functions.

Some years ago, Yamaha introduced the DG series products on the market: the firstborn was the DG1000, a programmable pre-amplifier. It has been projected to be matched with external effects and power units.

In a very short time the DG lineup grew up including the DG80-112 (80-watts, Celestion "G12H-100" 12-inch speaker x 1) and DG100-212 (100-watts, Celestion "Vintage 30" 12-inch speakers x 2) combo amps and the DG130H (130 watt) head. All models feature a solid state power unit to amplify the sound generated by the digital simulation section at the required volume and in linear mode. Moreover, the DG models include reverb and delay effects. The DG-series models are equipped with motorized knobs for a more quick and user-friendly operativity. The DG-Stomp integrates the same DG-line amp technology, but it is not equipped with motorized controls.

The new "A" DG Model series is an upgrading of the previous models and provides chorus and tremolo effects. The new DG80-210A model is equipped with two 10-inch speakers. It can also be stacked with an optional S112 speaker to provide a more effective full range tone.