Yamaha P4500 Power Amplifier in good condition. New “P” Series Power Amplifier The P4500 provides the user with excellent cost per watt value, building on that cost performance with efficient power consumption. Utilizing Yamaha’s new EEEngine technology, this amplifier delivers outstanding sound quality with remarkable efficiency. All of this power and performance comes in a compact 2-space rack-mount size that makes installation and transport easy. If you need transparent amplification with excellent reliability and superior performance, give the new P4500 a close look. Power/Efficiency Power rating for the P4500 is 700 watts per channel into 4 ohms. Yamaha’s new EEEngine (Energy Efficient Engine) consumes power efficiently, which allows the amplifier to produce the same amount of output power with about half the input power required. The EEEngine outperforms other efficiency-enhancing schemes like drive voltage switching, pulse-width modulation and switching series regulators – without degrading sound quality. Three Output Modes Provide Flexibility In the normal stereo mode, separate input signals are routed to each channel with independent L/R signal control. An extra margin of flexibility is provided in parallel mode, which feeds a single input signal to both channels while maintaining independent L/R signal control. Bridged mono mode can be used for extra high power. The P4500 pumps out 1400 watts in bridged mono, into 8 ohm loads. Quality Sound Transparent amplification without sound coloration is supplied with a frequency response of 10Hz to 50 kHz. A high damping factor of >200 provides excellent bass response and total harmonic distrortion is Comprehensive Protection Designed to prevent accidental damage to the amplifier itself and any connected speakers. Power ON muting suppresses the outputs until the amplifier circuitry has stabilized. To keep the operating temperature stable, the P1600 is equipped with ultra-quiet variable speed cooling fans. Added protection is supplied with heat oversink protection, noise filtering, a PC limiter for short circuit protection and an attenuator security cover to protect level settings. Input/Output Input attenuators are 31-position, dB-calibrated and allow independent L/R adjustment with smooth, noise-free control. Balanced XLR jacks, a barrier strip and balanced 1/4″ phone jacks accommodate input connections. Five-way binding posts provide solid, reliable speaker connections.