A 2.5 mm (3/32") 4-pole connection for balanced headphones joins a standard headphone output. Balanced audio enables the signals for L/R channels to be decoded and amplified separately by fully balanced circuitry. BTL (Bridge-Tied Load) mode delivers high 150 mW + 150 mW driving power, while an exclusive ACG (Active Control Ground) mode developed by Onkyo delivers a stunning increase in dimensionality and soundstaging.