The Yamaha P4050 is a compact and light power amplifier featuring three selectable output modes: 2-channel (140W x 2), 3-channel (140W + 80W x 2), and 4-channel (80W x 4) at 8 ohm loads. It includes extensive protection circuitry, such as DC detection, a PC limiter, and a POWER ON MUTE function to protect speakers.
The manual provides instructions on operating the front panel controls, including input attenuators and thermal indicators, as well as connecting inputs via screw terminals or TRS phone jacks. It details rear panel configurations for different models (U.S., Canadian, General) and explains how to switch between 2, 3, and 4-channel output modes.
In 2-channel mode, the power output is 140W x 2 at 8 ohm loads.
The cooling fan operates at high speed, and if it remains lit for a long time, you should check for blocked air vents.
Use the INPUT MODE switch on the rear panel to choose between 'CH.A TO ALL' or 'EACH CH.'