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Operating Manual - Powerflex Multi-Channel 70V Power Amplifier

INTRODUCTION

The Ashly Powerflex 70V amplifiers combine the

efficiency of a MOSFET high-speed switching output stage

with the sophistication of modern microprocessors and DSP

technology to produce a multi-channel 70V amplifier with

unprecedented versatility and power in a single 3RU pack-

age.

Although similar to other amplifiers with class D

output stages, 70V Powerflex amplifiers employ internal

microprocessor and DSP algorithms to optimize output

switching characteristics and eliminate the usual harshness

associated with high-frequency audio in standard class D

amplifiers. This optimization results in a spread-spectrum

switched output that varies with input amplitude and fre-

quency, and minimizes radiated emissions by eliminating

the single-frequency high-energy radiated interference

normally associated with switching outputs. The use of a

simple linear power supply removes another potential

source of radio-frequency interference, an important con-

sideration as racks become more and more heavily popu-

lated with digital signal processing equipment. A small

switching supply using flyback topology provides an effi-

cient power source for logic, protection, pre-amplifier and

indicator circuits.

To assure reliable operation, the usual protection

from excessive high-frequency, DC offset, and thermal

overload is supplemented by power supply undervoltage,

power supply overvoltage, and output overcurrent detec-

tion, all monitored and controlled by the latest in minia-

turized microprocessor technology.

In sum, Ashly 70V Powerflex amplifiers combine

the best of the new digital technologies with the best of

the traditional analog technologies to provide a product

that will supply clean sound at full output from every chan-

nel while generating minimal heat, thus increasing the re-

liability of every other piece of equipment in a rack as

well as preserving its own.

UNPACKING

As a part of our system of quality control, every

Ashly product is carefully inspected before leaving the

factory to ensure flawless appearance. After unpacking,

please inspect for any physical damage. Save the ship-

ping carton and all packing materials, as they were care-

fully designed to reduce to minimum the possibility of

transportation damage should the unit again require pack-

ing and shipping. In the event that damage has occurred,

immediately notify your dealer so that a written claim to

cover the damages can be initiated.

The right to any claim against a public carrier can

be forfeited if the carrier is not notified promptly and if

the shipping carton and packing materials are not avail-

able for inspection by the carrier. Save all packing mate-

rials until the claim has been settled.

AC POWER REQUIREMENTS

3.1

Voltage Requirements

Powerflex 70V amplifiers can be operated from

nominal 120VAC or 240VAC, 50/60Hz mains. This is user-

configurable by changing the insert in the AC Inlet (See

section 7.7). The power connector on the amplifier accepts

a standard IEC-320 receptacle.

For nominal 120VAC operation, the power cord

should be three-conductor, rated for at least 13A (16AWG).

The line fuse should be type MDA, 12A.

For nominal 240VAC operation, the power cord

should be three-conductor, rated for at least 10A (18AWG).

The line fuse should be type MDA, 10A.

3.2

Current Requirements

1.) Idle (no audio):

120V: 0.9A

240V: 0.5A

2.) With typical audio on all channels:

(Powerflex 670 with 200W loads, Powerflex 470 with 300W

loads)

120V: 10A

240V: 5A

Powerflex 70V amplifiers consume less than 12

amps when all channels operate at 1/8 power into rated

loads. This condition satisfies the UL, CSA and building

electrical code requirements for a piece of audio equip-

ment not to consume more than 80% of the current avail-

able when plugged into a grounded 15 amp outlet and

operated at 1/8 of maximum power.

3.3

AC Grounding Requirements

To reduce the risk of ground loop hum, all system

ground references should originate at the same point in

your AC power distribution. Do not remove the amplifier's

ground pin, as it creates a potential shock hazard.