Ashly PowerFlex 470 User Manual

Powerflex™ 470 70 Volt - Four Channel Power Amplifier

Architects Specifi cations

Powerflex-470 70 Volt Four Channel Amplifier

The power amplifier shall be a multichannel unit consisting of
four independent channels. Each amplifier shall be able to deliver
250 watts at 70 volts, , 500 watts at 140 volts, all channels
driven. Each individual channel shall be able to drive 70 volt dis­tributed audio lines without the use of an external transformer.
When channels are paired, the paired channels shall be able to
drive 140V distributed audio lines without the use of external
transformers.

The amplifier shall have a gain of 34.0 dB (50x) and an input
sensitivity of 1.40 Volts RMS for full rated output. Frequency
response shall be 20Hz to 20kHz +/- 0.5dB. Hum and noise
shall be at least 100dB below full output (A-weighted) and
SMPTE intermodulation distortion shall be less than 0.2%. Total
Harmonic Distortion (20Hz - 20KHz) shall be less than 0.5%.

Each amplifier channel shall be supplied with an input attenua­tor located on the rear panel input module. Each pair of inputs
shall have a bypassable high pass filter of 12dB/octave at 80Hz,
a switch to select independent or parallel channel mode and a
switch to select normal 70V or bridge 140V mode. There shall

Technical Notes & Specifications

be an input ground switch located on the input module to select
chassis or floating ground operation.

The inputs shall be active balanced design, with an impedance
of 10K ohm accessible with euroblock connectors. The outputs
shall be terminated with a screw terminal connector.

Individual channel indicators for protect, thermal overload, clip
and signal present shall be LEDs located on the front panel.

Cooling shall be supplied by a temperature sensitive two-speed
fan drawing air from the front of the unit and exiting through the
rear.

The unit shall be powered from 110 - 125V AC, 220 - 250V
AC, 50/60Hz. Dimensions of the unit shall be 19”L X 5.25”H X

16.5”D. The chassis shall be constructed from 16 gauge steel
with an aluminum face panel and weigh 45lbs.

The unit shall be the Powerflex-470, 70 Volt four channel power
amplifier manufactured by Ashly Audio, Inc.

• Four Channel Amplifier - 250W/Ch
70V, 500W/Ch 140V

• High-Speed Switched MOSFET

Output Design with Spread Spectrum
Switching Technology

• Superior Efficiency Over

Conventional Linear Amplifiers

• Input Module with Level Controls
Located on Rear Panel

• Switchable HPF on Inputs

• Euroblock Input Connections

• Screw Terminal Output Connections

• Individual Channel Front Panel Level

and Protection Indicators

• Multiple Protection Circuits

• Bridgeable Channel Pairs

• Internal Modular Design

• Quiet, Two-Speed Fan

• Front In/Rear Out Channeled Air-

Flow

• Five Year Warranty

General Specifications Powerflex 470
*Power Output
(Maximum Average Power, 0.1% THD, 1KHz)

Crosstalk: < -75dB (20Hz - 1KHz)

Signal Present Signal Sensitivity: 14mV RMS (-34.9dBu)

Rated Per Channel, Two Channels Driven
70V: 300Watts RMS
140V (Mono Bridged, 1-Channel): 600 Watts RMS

Rated Per Channel, Four Channels Driven
70V: 250 Watts RMS
140V (Mono Bridged, 2-Channels): 500 Watts RMS

Input Impedance: 10K ohm balanced, 37K ohm unbalanced

High Pass Filter: 80Hz, 12dB/octave, internally selectable

**THD (20Hz - 20KHz, 250W, 4-Channels Driven): <0.5%

**IMD
(SMPTE 60Hz/7KHz 4:1): <0.2%
**Hum and Noise: < -100dB from full output (A-weighted)

Full Power Input Sensitivity: 1.4V RMS (5.1dBu)

Frequency Response: ±0.5dB (20Hz-20kHz, full power)

Voltage Gain: 50X (34.0dB)

* Continuous power limited by power line capacity
**Non-conventional amplifiers require bandwidth limiting for all distortion and noise measurements
Signal peaks in audio programming may trigger protection circuitry at low line voltages

Specifications are subject to change or improvement without notice

Power Requirement: 110-125VAC, 220 - 250VAC, 50/60Hz

Typical Idle Current
120V: 0.94A
240V: 0.48A

Current with Typical Audio Program Material (4 Channels Driven)
120V: 10.0A
240V: 5.0A

Connections
Input: Euroblock
Output: Screw Terminal

Cooling: Forced Air, Thermal Sensitive 2-Speed Fan, Front Inlet/Rear

Outlet

Dimensions: 19”L x 5.25”H x 16.5”D

Construction: All-Steel Chassis, Extruded Aluminum Front Panel

Weight: 45 lbs. net, 52 lbs. shipping

Specification conditions are: 120VAC mains at 60Hz, 25° C

Rear Panel Powerflex-470

Applications:

Any 70V and 140V multichannel power amplification application, paging systems, cinema systems, boardroom audio applications,
multiple zone restaurant, bar, theme park or auditorium systems.

Ashly manufactures a complete and comprehensive line of Graphic and Parametric Equalizers,

Electronic Crossovers, Power Amplifiers, Compressor-Limiters, Mixers, and

Amplifier Input Options. Please call, write or visit our web site for information on any of these Ashly Products.

Ashly Audio Inc., 847 Holt Road, Webster, NY 14580-9103, Toll Free [phone], Telephone [phone], FAX [phone]

Internet: http://www.ashly.com, email: [e-mail]