Power/ Efficiency

Power ratings for the P1600, P3200 and P4500 are 230, 520

and 720 watts per channel into 4 ohms, respectively. 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 in all three models. The P1600, P3200 and

P4500 pump out 460, 1040 and 1440 watts in bridged mono

respectively, all into 8 ohm loads.

Quality Sound

Transparent amplification without sound coloration is supplied

with a frequency response of 10 Hz to 50 kHz. A high damping

factor of >200 provides excellent bass response and total

harmonic distortion is <0.05% -perfect for today's digital

sources and musical instruments.

Comprehensive Protection

All three models offer 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, all three models are equipped with ultraquiet, 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.

Yamaha's EEEngine

(Energy Efficient Engine)

EEEngine Technology

By means of a switching drive system, Yamaha's

EEEngine technology reduces AC power requirements

and heat loss while maintaining output power and

sound quality.

Input power is supplied through a high-efficiency

current buffer. During low requirement periods, it

transparently switches the input power on and off

automatically as needed. As the signal becomes large,

an independently responding auxiliary power line

supplies the additional power, as required. The output

isn't compromised

because the

auxiliary power line

is driven by the

power supply

voltage, which can

maintain the

maximum output to

the speaker load.

The amplifiers

make more efficient

use of the AC

power than conventional amplifier

technology.

With EEEngine

technology, the

electric company

will wonder how

you're doing it!