Ashly SRA-120 manual Typical Applications

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Operating Manual - SRA-120 Power Amplifier

In situations where the power amp and its signal source are separated by great distances, a ground voltage difference may exist between the amp’s chassis ground and the input cable’s ground. Connection of these two grounds through the jumper strap may cause large ground currents to flow (which is known as a ground loop), caus- ing a hum noise in the amp’s output. Unless you have such a situation with a hum problem that cannot be solved by using balanced input connections, the ground jumper strap should remain in place.

7.2Input Sensitivity Switch

This switch selects between a 0 dBu input sensi- tivity in the "out" position for use with professional au- dio sources, and -10 dBu input sensitivity in the "in" po- sition for use with low line-level sources such as tape decks, CD players, DAT machines, etc.

7.3Normal/Bridging Switch

This switch selects between NORMAL mode in the “out” position where both outputs are in-phase with their respective inputs, and BRIDGED mode in the “in” position where channel 1 output is switched out of phase with it's input. In BRIDGED mode, the channel 2 red bind- ing post becomes the (+) in-phase speaker output terminal

and the channel 1 red binding post becomes the (-) out-of- phase speaker terminal. To properly operate in bridged mono mode, the Mono switch must also be selected.

7.4Stereo/Mono Switch

This switch selects between stereo mode in the "out" position and mono mode in the "in" position. In mono mode, channel 1 input is sent to both amplifier chan- nels, and is controlled through the channel 1 level con- trol.

7.5Speaker Outputs - Binding Posts

A pair of dual banana binding posts provide the stereo speaker outputs. The minimum load impedance is 4 ohms per channel in normal mode, and 8 ohms in bridged mode. In BRIDGING mode, the channel 2 red binding post is the (+) in-phase speaker output terminal and the channel 1 red binding post becomes the (-) out-of-phase speaker terminal.

CAUTION! NEVER CONNECT THE TWO RED BINDING POSTS TOGETHER OR CONNECT EITHER RED BINDING POST TO A BLACK BINDING POST!

8.TYPICAL APPLICATIONS

8.1Stereo Sound Reinforcement System

In this situation, the audio source feeding the SRA-120 is a professional level (0dBu) stereo mixer. All three mode switches should be in the "out" position.

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Contents Operating Manual Table Of Contents This Apparatus Must be Earthed AC Power Requirements IntroductionUnpacking Cable RequirementsRACK-MOUNTING Requirements Front Panel Features Rear Panel Features InputsBalanced Inputs Unbalanced InputsTypical Applications Stereo Playback Monitoring System Mono Operation in High Level Bi-Amped SystemTroubleshooting Tips Design TheoryNo Audio Output Distorted SoundExcessive Hum Noise DimensionsExcessive Hiss Noise Other Information SpecificationsWarranty Policy Schematics SRA-120 Block Diagram and Wiring DiagramSRA-120 Channel One Schematic Diagram SRA-120 Channel Two Schematic Diagram SRA Rev
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SRA-120 specifications

The Ashly SRA-120 is a powerful and versatile power amplifier designed for professional audio applications. Known for its reliability and exceptional sound quality, the SRA-120 stands out in various settings, including live sound reinforcement, installed sound systems, and mobile audio installations.

One of the key features of the Ashly SRA-120 is its robust power output. It delivers 120 watts per channel at 8 ohms, making it suitable for driving a range of speakers effectively. The amplifier can also produce 200 watts per channel at 4 ohms, ensuring ample power for more demanding situations where higher speaker sensitivity and increased volume are required.

The SRA-120 incorporates advanced thermal management and protection systems, which allow the amplifier to operate reliably under extended use without overheating. This feature is especially important for professionals who rely on consistent performance during lengthy events or in commercial applications. Additionally, the unit is equipped with short circuit, DC, and thermal protection to safeguard both the device and the connected speakers.

Another notable technology found in the SRA-120 is its low noise operation. The amplifier employs sophisticated circuitry which minimizes distortion and unwanted noise, essentially delivering a clearer and more detailed audio signal. This characteristic is particularly beneficial in environments where audio quality is of the utmost importance, such as theaters, auditoriums, and conference rooms.

Control and connectivity options enhance the usability of the Ashly SRA-120. It features balanced XLR and 1/4-inch inputs, making it easy to connect to various mixing consoles and audio sources. The amplifier also provides both binding post and Speakon outputs, allowing for flexibility in speaker connections and ensuring compatibility with various speaker types.

In terms of construction, the SRA-120 boasts a rugged design, making it suitable for both portable and permanent installations. It is housed in a lightweight yet durable chassis that can withstand the rigors of travel and extensive use.

Overall, the Ashly SRA-120 represents an excellent choice for audio professionals seeking a reliable, high-quality power amplifier with essential features and advanced technology, all while maintaining exceptional audio fidelity and performance in any setting.
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