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Ashly P70 Owners Manual Ashly P70 Owners ManualPage Page

Output Power

EIA Spec.

(±1dB <1% THD @ 1KHz)

Both Channels Driven

Dual

Bridged-Mono

FTC Spec.

(<.1%THD 20Hz-20KHz)

Both Channels Driven

Dual

Bridge-Mono

Total Harmonic

Distortion

(at rated power)

20Hz-1KHz

20KHz

IM Distortion

(at rated power)

Damping Factor (25Ω)

Bandwidth (-3dB)

Slew Rate

Frequency Response

(20Hz-20KHz)

Full Power Input Sensitivity

Input Impedance

Hum and Noise

(20Hz-20KHz unweighted)

Cooling

Power Requirement

Size

Shipping Weight

SPECIFICATIONS

P70-400 P70-800

200W @ 70V 400W @ 70V

400W @ 140V 800W @ 140V

160W @ 70V 320W @ 70V

320W @ 140V 640W @ 140V

<.05% <.05%

.< .1% < .1%

< .05% < .05%

>500 20Hz-1KHz >500 20Hz-1KHz

100KHz 100KHz

>20V/µS >20V/µS

+0/-.4dB +0/-.4dB

1.77V 1.77V

20KΩ Balanced 20KΩ Balanced

>105dB below full output >105dB below full output

Forced Air Forced Air

790W Max, 75W Idle 1580W Max, 150W Idle

120VAC 50-60Hz 120VAC 50-60Hz

(240V available) (240V available)

19"Wx3.5"Hx17.8"D 19"Wx3.5"Hx17.8"D

44 lbs. 60 lbs.

12 1

ASHLY

70 VOLT POWER AMPLIFIERS

Models P70-400, P70-800

TABLE OF CONTENTS

Introduction ..................................................................... 1

Standard Connections and Controls ................................ 2

Typical Applications ....................................................... 5

Input Options ................................................................... 7

Transformer Input Option ................................................ 7

Limiter Input Option ........................................................ 7

Crossover Input Option ................................................... 8

Mic/Line Mixer Input Option ......................................... 8

Design Theory ................................................................. 10

Dimensional Diagrams ..................................................... 11

Specifications .................................................................. 12

INTRODUCTION . . . Why MOSFETS?

The Ashly P70 series MOSFET amplifiers combine the sonic excellence of

a high-end stereo amp with the ruggedness and stamina necessary in commercial

audio. The P70 series amps use power MOSFETs (metal-oxide-semiconductor,

field-effect transistors) for their superior audio fidelity and unmatched reliability

as proven in Ashly amps for over ten years.

MOSFET output devices are used in the P70 series amps because of their

superior performance characteristics over bipolar power transistors which are

normally used in conventional power amp designs. The power MOSFET is

inherently more self-regulating and does not exhibit the failure modes that bipolar

transistors are susceptible to. MOSFETS do not require any thermal runaway

compensation circuitry, thus making the design simpler and more reliable. MOS-

FETS do not exhibit secondary breakdown (an instantaneous failure in bipolar

transistors when their collector current exceeds a safe level, even at voltages much

lower than their maximum rating). The MOSFET will even withstand a dead shorted

output resulting in very high drain current without any protection circuitry for a very

short time.

1 2 3 4 5 6

Indice de contenidos

Pagina 1 - POWER AMPLIFIERS

Ashly P70 Owners Manual Ashly P70 Owners ManualPage PageOutput PowerEIA Spec.(±1dB <1% THD @ 1KHz)Both Channels DrivenDualBridged-MonoFTC Spec.(<

Pagina 2 - DIMENSIONS

Ashly P70 Owners Manual Ashly P70 Owners ManualPage PageDIMENSIONS112MOSFETS also do not have a “storage time” associated with them (aphenomenon found

Pagina 3 - DESIGN THEORY

Ashly P70 Owners Manual Ashly P70 Owners ManualPage PageDESIGN THEORYAshly P70 series amplifiers use a direct-coupled output stage with totallydiscret

Pagina 4 - 5. SPEAKER OUTPUTS

Ashly P70 Owners Manual Ashly P70 Owners ManualPage Page9Figure 8: Crossover Input OptionFigure 9: Mic/Line Mixer Input Option4It is recommended that

Pagina 5 - TYPICAL APPLICATIONS

Ashly P70 Owners Manual Ashly P70 Owners ManualPage Page8CROSSOVER INPUT OPTIONThe XR-1 crossover input option provides separate high-pass and low-pas

Pagina 6 - INPUT OPTIONS

Ashly P70 Owners Manual Ashly P70 Owners ManualPage Page7out-of-phase. The channel 1 output terminal is used as the positive and thechannel 2 output