The P-75D, P-150D and P-300D are Toa professional 2-channel (stereo) power
amplifiers, with nominal power outputs of 75 watts, 150 watts and 300 watts,
respectively per channel with both channels driven into 8 ohms. Into 4 ohms they
deliver 100 watts, 220 watts and 480 watts. In BTL (Bridged) mono use, the P-
75D, P-150D and P-300D deliver 200 watts, 440 watts and 960 watts of power
into 8 ohms. All models have frequency response of +0dB, –0.5dB (20Hz to
20kHz), total harmonic distortion of less than 0.1% (at each nominal power
outputs, 8 ohms, 20Hz to 20kHz).
Each model offers many unique features such as, an octal socket for optional
matching transformer to convert unbalanced input to balanced, magnetic circuit
breaker, calibrated input attenuator, short circuit protection circuitry, 3-second
turn-on delay, current limiter circuitry, protection indicator LED's, signal
presence indicator LED's, peak indicator LED's, ground terminal strip, high pass
filter, mono/stereo mode switch, and true dual-mono configuration. Protection
indicator LED's are designed to actuate in cases of short circuit, D.C drift, turn-on
delay and thermal warning. The signal presence indicator LED's glow when
more than -30dB signal level is fed to the inputs.
For ease of maintenance and service, each channel of these amplifiers is built
with modular, plug-in boards on a sub-chassis that can be quickly removed and
replaced or repaired.
All models are mechanically reinforced by a rugged front panel made of 3mm
(1/8") thick cast-aluminum and lined with another 3mm (1/8") thick steel. With
their overall sturdy construction, they are capable of withstanding even the
roughest use on the road.
1. Magnetic Circuit Breaker Power Switch
Both the primary mains (A.C. line) overload protection and the on/off switch
are combined into a rocker-actuated, magnetic circuit breaker, whose
operation, unlike fuses, is predictable and independent of temperature.
Returning the switch to the "on" position resets the system.
2. Calibrated Input Attenuators
22-step detented input attenuators are provided for easy, accurate input
sensitivity adjustment. The attenuators are in 2dB steps from 0dB
attenuation to -34dB, then steps of -37dB, -42dB, -50dB, infinity. This
arrangement provides a smooth, noise free transition from the highest to the
lowest audio level.
3. Short-Circuit Protection Circuitry
Speaker protection is provided with relay circuitry that disconnects the load
whenever a short-circuit or harmful D.C. current is present across the output
terminals.
4. 3-Second Turn-On Delay
To help eliminate annoying clicks or pops which can occur upon turn-on in
large sound systems, a three second mute/delay circuit is incorporated. The
mute/delay circuit actuates the relay, and then disconnects the speakers the
instant the circuit breaker is shut off.
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General Description
Features
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