Ashly SRA-120 manual RACK-MOUNTING Requirements

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Operating Manual - SRA-120 Power Amplifier

4.2Output Cables

The wire gauge used for speaker cables is impor- tant, in that inadequate wire gauge adds significant re- sistance to the speaker’s own impedance, reducing the power which is actually delivered to the speaker. It also results in a decrease in the damping factor and possible fire hazard.

Since power at the speaker load is a primary con- cern in system design, we have included a table to best determine appropriate wire gauge for your application. Table 4.1 lists the percentage of the speaker load power which would be lost in an arbitrary 100 ft. run of 2-con- ductor cable. This table expresses the power loss as a percentage of the load’s power rather than the total am- plifier output power, so that you can use this table to ac- curately determine power loss to the load at other cable lengths. For example, if you plan to deliver 100 watts to an 8Ω load through 50 ft of 14 ga. cable, the power loss in the cable would be 3.2% ÷ 2 = 1.6% of 100 watts or

1.6watts lost in the cable. Table 4.1 also gives the resis- tance per 100 feet of common copper wire gauges.

Wire Gauge

Ω/100ft

8Ω load 4Ω load 2Ω load

#8

.0605Ω

0.8%

1.5%

3.0%

#10

.1018Ω

1.3%

2.5%

5.1%

#12

.1619Ω

2.0%

4.0%

8.1%

#14

.2575Ω

3.2%

6.4%

12.9%

#16

.4094Ω

5.1%

10.2%

20.5%

#18

.6510Ω

8.1%

16.3%

32.6%

Table 4.1: Percentage of speaker load power lost in 100 foot run of 2-conductor cable.

5.RACK-MOUNTING REQUIREMENTS

5.1Mechanical

All Ashly amps are designed to fit in standard 19-inch racks. Avoid placing the amp immediately next to devices which are sensitive to heat or magnetic fields (high-gain preamps, magnetic data storage, etc.)

5.2Cooling

The SRA-120 will cool more efficiently with space above and below the chassis, although most appli- cations will not require this.

The following chart indicates maximum BTU per hour under varying load conditions, so that accurate as- sessment of room ventilation needs can be made. Ther- mal output is approximated by subtracting audio output power from the total power consumption of the ampli- fier. All values assume the amplifier is driving both chan- nels and just peaking at the clipping level.

Idle

40 BTU

8Ω loads

200 BTU

4Ω loads

320 BTU

Table 5.2: Maximum BTU per hour (both channels driven)

5.3Grounding

In some installations where a sound system is sensitive to RF noise or system-induced oscillation, it may be necessary to ground the amplifier's chassis to the rack enclosure. This is accomplished using star type lockwashers on the four rack mounting screws. These star washers will penetrate through the amplifier's paint to adequately ground the chassis to the rack.

5.4Security Covers

For installations where it is desirable to protect the front panel level controls from tampering or acciden- tal misadjustment, use an Ashly security cover. Installa- tion is simple and does not require removal of the equip- ment from your rack. See your Ashly dealer for details.

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Contents Operating Manual Table Of Contents This Apparatus Must be Earthed Introduction AC Power RequirementsUnpacking Cable RequirementsRACK-MOUNTING Requirements Front Panel Features Inputs Rear Panel FeaturesBalanced Inputs Unbalanced InputsTypical Applications Mono Operation in High Level Bi-Amped System Stereo Playback Monitoring SystemDesign Theory Troubleshooting TipsNo Audio Output Distorted SoundExcessive Hum Noise DimensionsExcessive Hiss Noise Other Information SpecificationsWarranty Policy SRA-120 Block Diagram and Wiring Diagram SchematicsSRA-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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