Pioneer RS-A09X DAC for high-quality sound, set of 4. - Model: RS-A09X - Quantity: 4 - Accessories: Instruction manual - Brand: Pioneer - Type: DAC Thank you for viewing. Carrozzeria RS-A09X high-quality power amplifier x 4 With instruction manual I am selling these due to a system change. They were removed a month ago and their operation was confirmed to be problem-free. These are used items, so there may be minor scratches and light soiling. This time, I am selling 4 units. The RS-A09X was used in a 3-way + sub system, and the sound quality was superb. Please consider purchasing them.