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Ashly SRA-120 manual

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Table of contents for the manual

  • Page 1

    ASHL Y AUDIO INC. 847 Holt Road W ebster , NY 14580-9103 Phone: (716) 872-0010 T oll-Free: (800) 828-6308 Fax: (716) 872-0739 Internet: http://www .ashly .com/ SRA-120 Power Amplifier Operating Manual SRA-120 SRA-120 Si g. Cli p SRA-12 0 Stereo Power Amplifier Prot ect Si g. Cli p Ster eo Hea d ph on e s Channel 1 (M ono) Channel 2 Powe r Chan ne l[...]

  • Page 2

    Operating Manual - SRA-120 Power Amplifier 2 T abl e Of Contents 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 UNP ACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 AC POWER REQUIREMENTS . . . . . . . . . . . .[...]

  • Page 3

    3 Operating Manual - SRA-120 Power Amplifier 9 DESIGN THEOR Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 10 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 10.1 No Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 4

    Operating Manual - SRA-120 Power Amplifier 4 1. INTRODUCTION Congratulations on your purchase of the Ashly SRA-120 professional stereo power amplifier . This single rack-space (1 3/4" height) amplifier delivers a substan- tial amount of power with exceptional audio quality and many features typically found only in lar ger power am- plifiers, B[...]

  • Page 5

    5 Operating Manual - SRA-120 Power Amplifier 4.2 Output 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 ha[...]

  • Page 6

    Operating Manual - SRA-120 Power Amplifier 6 Sig. C li p Prot ect Sig. C li p Stere o Hea dph ones Channe l 1 (Mono) Ch ann el 2 Level (dB) Level (dB) - 0 -1 -3 -6 -10 -20 - 0 -1 -3 -6 -10 -20 SRA-120 St ereo Po wer Am p l ifier 6.5 Pr otect Indicators Protect mode in the SRA-120 is automatically activated during extreme fault conditions, as well a[...]

  • Page 7

    7 Operating Manual - SRA-120 Power Amplifier SRA-1 20 Po w er Channel 2 Prot ect 7. REAR P ANEL FEA TURES 7. 1 Inputs The input of the SRA-120 amplifier is equipped with balanced 1/4" tip-ring-sleeve (TRS) phone jacks and balanced screw-terminal inputs. Each channel's connec- tors are internally wired in parallel and may be used with bala[...]

  • Page 8

    Operating Manual - SRA-120 Power Amplifier 8 In situations where the power amp and its signal source are separated by great distances, a ground voltage dif ference 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 lar ge ground currents to flow (which is[...]

  • Page 9

    9 Operating Manual - SRA-120 Power Amplifier 8.2 Stereo Playback Monitoring System Here the SRA-120 is fed from a low line-level (-10dBu) stereo tape machine or CD player . Only the sensitiv- ity switch should be depressed. 8.3 Mono Operation in High Level Bi-Amped System Here the SRA-120 is fed from the high frequency output of a professional two-[...]

  • Page 10

    Operating Manual - SRA-120 Power Amplifier 10 9 . DESIGN THEOR Y Ashly engineers set out to design a single rack space stereo power amplifier delivering a minimum of 120 watts total with the sonic excellence, mechanical rug- gedness and unsurpassed reliability Ashly amps are known for . These qualities were upheld while containing other important p[...]

  • Page 11

    11 Operating Manual - SRA-120 Power Amplifier • Signal present indicators active but clip LED is not: Applied input signal is distorted befor e it gets to the amp. Check to see if a piece of equipment in the signal chain befor e the amp is clipping. Normally the amplifier should be operated with input levels fully CW to maximize headr oom in the [...]

  • Page 12

    Operating Manual - SRA-120 Power Amplifier 12 12. SPECIFICA TIONS 12.1 Output Power: Maximum A verage Power , 0.1% THD, 1KHz RMS W atts Per Channel, Both Channels Driven 8 ohms: 40 W 4 ohms: 60W Bridged Mono Mode: 8 ohms: 120W FTC Continuous Power , 0.1% THD, 20Hz-20KHz RMS W atts Per Channel, Both Channels Driven 8 ohms: 40 W 4 ohms: 55 W 12.2 Fre[...]

  • Page 13

    13 Operating Manual - SRA-120 Power Amplifier 14. SCHEMA TICS: Figur e 15.1: SRA-120 Block Diagram and Wiring Diagram.[...]

  • Page 14

    Operating Manual - SRA-120 Power Amplifier 14 Figur e 15.2: SRA-120 Channel One Schematic Diagram.[...]

  • Page 15

    15 Operating Manual - SRA-120 Power Amplifier Figur e 15.3: SRA-120 Channel T wo Schematic Diagram.[...]

  • Page 16

    Printed in USA 4/97 SRA Rev 3 Operating Manual - SRA-120 Power Amplifier ASHL Y AUDIO INC. 847 Holt Road W ebster , NY 14580-9103 Phone: (716) 872-0010 Fax: (716) 872-0739 T oll Free (800) 828-6308 Internet: http://www .ashly .com  1997 by Ashly Audio Corporation. All rights reser ved worldwide.[...]