Ashly SRA-120 User Manual 2

SRA-120

The power amplifier, being of two channels, shall deliver a minimum power of
45 watts RMS per channel into 8 ohm loads and 60 watts RMS per channel into 4
ohms. When switched into Bridged-Mono mode, the amplifier shall deliver a total
of 120 watts RMS into 8 ohms. The amplifier shall be immune to damage from
shorted, open, or mismatched loads and shall feature independent thermal protec­tion, turn on delay, and instantaneous turn-off. The amplifier shall have a gain of
26 dB + .2dB per channel. The input sensitivity shall be selectable between
.775Vrms or .245Vrms via a rear panel switch. Frequency response shall be 20Hz to
20kHz + .2dB. The amplifier shall be stable into any load, including pure capaci­tors and inductors. Hum and noise shall be at least 100dB below full output and
SMPTE intermodulation distortion shall be less than .01% at full output. To mini­mize hum and reduce overall weight, the unit shall utilize a toroidal power supply
transformer.

The amplifier shall have rear panel switching for mono or stereo and bridging

modes. The inputs shall be of balanced bridging type with both 1/4” phone and

barrier strip connections located on the rear panel of the unit. A ground lift strap
shall be provided to float the input ground from chassis ground if necessary. An
input jack on the front panel shall be provided for connection of stereo head­phones. A separate attenuator control for each channel shall also be located on the
front panel. There shall be status L.E.D.’s for each channel on the front panel of
the amplifier to indicate signal present, clip alert, and “protect mode”. Power
requirements of the amplifier shall be 350W max, 30W idle @ 120VAC, 50Hz­60Hz. For use in other countries, the unit shall also be available as a 240VAC
model. The unit shall be one rack space (1.75”) high and no more than 10” deep.
The amplifier must be convection-cooled, with large, extruded aluminum heat sinks
with vertically oriented fins located on each side of the unit. The shipping weight
of the unit shall be 20 pounds. The amplifier shall be covered under a full limited
warranty of not less than five years. The amplifier must be made in the USA. The
amplifier shall be the model SRA-120, manufactured by Ashly Audio, Inc. of
Rochester, New York.

TECHNICAL NOTES & SPECIFICATIONS

ARCHITECTS SPECIFICATIONS

SRA-120 Convection Cooled Amplifier

Features:

• Convection Cooled

• Class-A Full Complementary Front
End

• Stereo, Mono & Bridging Modes

• Barrier Strip and 1/4" Inputs

• Input Sensitivity Select Switch

• Turn-on Delay

• Instantaneous Turn-off

• Independent Thermal Protection

• 5-Year Worry-Free Warranty

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]

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.

Applications:

Churches, Studios, Concerts, Dance Clubs, PA Systems, Auditoriums, Lecture Halls, Sports Stadiums, Outdoor Festivals

General Specifications SRA-120

EIA SPECIFICATION (± 1dB, <1% THD, 20Hz-20kHz)
Stereo (Rated Per Channel)
4 ohm: 60W
8 ohm: 45W
Mono Bridged
8 ohm: 120W
FTC SPECIFICATION
(< 0.1% SMPTE IM)
Stereo (Rated Per Channel)
4 ohm: 55W
8 ohm: 40W
Mono Bridged
8 ohm: 110W
Total Harmonic Distortion:
Stereo @ 35W per channel into 8 ohm) < .01% 1kHz, < .05% 20Hz-20kHz
IM Distortion:
(stereo @ 35W per channel into 8 ohm) < .01%
Damping Factor: >200, 8 ohm, <1kHz
Slew Rate:
(Stereo Operation) >10V/µS
(Mono Bridged Operation) >20V/µS
Frequency Response: ±0.2dB (35W/ch, 20Hz-20kHz)
Output Noise & Hum: (20Hz-20kHz unweighted) 100 dB

below full output

Input Impedance: 20K ohm balanced

Input Sensitivity: (switchable) .775Vrms or .245Vrms
Voltage Gain: (switchable) 26.0dB or 36.0dB
Output Protection: Instantaneous protection from shorted output

and voltage-current overload limiting.

Load Protection: 2 second output turn-on delay and instanta

neous turn-off to protect load from transients.
Subsonic and ultrasonic filtering.

Thermal Protection: Thermal sensing on each channel will turn off

outputs independently under overheat condi
tions

Power Requirements: 350W max, 30W idle @ 120VAC, 50Hz-60Hz.

(240VAC available)
Cooling: Convection cooled
Connectors:
Input: 1/4 phone jacks and barrier strip.
Output: 5-way speaker binding posts, 1/4 headphone

jack
Controls: Rear panel: stereo/mono switch, bridge/normal

switch, sensitivity switch and ground lift

jumper. Front panel: two attenuator controls

and front panel power switch.
Indicators: Front panel signal present, clip and protect

LEDs for each channel
Dimensions: 19L x 10D x 1.75H
Shipping Weight: 20lbs

Rear Panel SRA-120