Ashly P70 Owners Manual
Ashly P70 Owners Manual
Page
Page
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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 (25
Ω)
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/
µ
S
>20V/
µ
S
+0/-.4dB
+0/-.4dB
1.77V
1.77V
20K
Ω
Balanced 20K
Ω
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.
