QSC Audio SRA 1222, SRA 2422 User Manual

SRA

1222 SRA SRA

Studio Reference Amplifier

User Manual

2422

3622

*TD-000107-00*

TD-000107-00 rev.A

IMPORTANT SAFETY INSTRUCTIONS

& EXPLANATION OF SYMBOLS

1- Read these instructions. 2- Keep these instructions. 3- Heed all warnings. 4- Follow all instructions. 5- Do not use this apparatus near water. 6- Clean only with a dry cloth. 7- Do not block any ventilation openings. Install in accordance with QSC Audio Product’s instructions. 8- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. 9- Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one blade wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit your outlet, consult an electrician for the replacement of the obsolete outlet. 10- Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit the apparatus. 11- Only use attachments/accessories from QSC Audio Products, Inc. 12- Use only with carts, stands, tripods, brackets, interconnecting cables, or software specified by QSC Audio Products. When moving or transporting using a cart, use caution to avoid injury from tip-over. 13- Unplug the apparatus during lightning storms or when unused for long periods of time. 14- Refer all servicing to qualified personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. 15- When installing equipment into a rack, distribute the units evenly. Otherwise, hazardous conditions may be created by an uneven weight distribution. 16- Connect the unit only to a properly rated supply circuit. 17- Reliable earthing (grounding) of rack-mounted equipment should be maintained. 18- Maximum operating ambient temperature is 50°C.

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous” voltage within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in this manual.

CAUTION: To reduce the risk of electric shock, do not

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

remove the cover. No user-serviceable parts inside. Refer servicing to qualified service personnel. WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture.

Your SRA amplifier has a serial number located on the rear panel, near the AC cord entry. It looks like the example at right. Please write the serial number down and keep for your records. Retain your sales receipt; it is your proof of purchase.

Model: SRA________________________ Serial Number: ________________________ Date of Purchase: ______________________ Purchased From: _______________________

QSC® is a registered trademark of QSC Audio Products, Inc.

“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office

Speakon® is a registered trademark of Neutrik Inc., Lakewood, NJ

TABLE OF CONTENTS

INTRODUCTION

General Overview..........................................................................................4

Illustrations.............................................................................5

UNPACKING

Unpacking and Inspection..................................................................................6

What is Included.............................................................................................6

SETUP

Stand-alone Mounting....................................................................................6

Rack Mounting...............................................................................................7

Supporting the Rear of the Amplifier..........................................................9

Gain Control Security Cover.....................................................................10

Cooling Requirements...................................................................................12

AC Power Requirements..............................................................................13

Operating Mode Selection..........................................................................14

Clip Limiters................................................................................................18

Low Frequency Filters..................................................................................19

CONNECTIONS

Inputs:

General Use and Recommendations..................................................20

XLR and RCA Connector Pinouts..................................................21

Outputs:

General Use and Recommendations.................................................22

Binding Posts.................................................................................23

Speakons...................................................................25

Remote On/Off (Remote Trigger).......................................................................28

DataPort.................................................................................................31

USE

AC Power Switch.........................................................................................32

Gain Controls................................................................................................32

Signal and Clip LED indicators......................................................................32

APPLICATION EXAMPLE...........................................................................................33

TROUBLESHOOTING......................................................................................34

SPECIFICATIONS............................................................................................................36

WARRANTY INFORMATION ..............................................................................................38

HOW TO CONTACT QSC AUDIO PRODUCTS ...........................................................38

INTRODUCTION- General Overview

QSC’s SRA Series Amplifier

Congratulations on your purchase of the SRA (Studio Reference Amplifier)Series power amplifier. To help you obtain the best results from your purchase, we encourage you to carefully review this manual. With information including connections, configuration and operation, it offers many useful guidelines.

Building upon QSC’s widely recognized reputation throughout the cinema industry as “The Power Behind the Pictures,” the SRA Series of power amplifiers bring world-class audio performance to recording studios, high-end home theaters, and numerous additional applications. This SRA Series manual encompasses three models- the SRA1222, SRA2422, and the SRA3622 - with power points ranging from 200 to 750 watts per channel @ 8 ohms. These amplifiers draw upon QSC’s expertise in high frequency switching power supplies and include the popular DataPort for integration with optional QSC crossover and DSP modules.

The SRA’s exemplary performance is a result of QSC’s high current output section and advanced HF switch mode power supply technology that enables these amplifiers to weigh considerably less than conventional transformer driven models while also occupying less rack space. This patented technology delivers crystalclear highs, smooth and accurate mids, and a powerful, articulate low-end response - providing realism to your audio playback. Further, a full complement of connectors facilitates easy integration into virtually any environment.

QSC’s SRA Series amplifiers also boast useful features such as individually selectable clip limiters and subsonic filters, front-mounted lockoutable gain controls, plus signal and clip LED indicators to monitor performance. SRA Series amplifiers can be configured for stereo, parallel, or bridge mono operation. As expected from the world’s largest manufacturer of professional power amps with an unparalleled reputation for reliability and customer support, the SRA Series amplifiers deliver performance you can count on.

SRA Features

• Active inrush limiting- will not trip circuit breakers at turn on

• A hum-free noise floor and ultra low distortion

• Optional DSP modules for the ultimate in custom applications

• Short circuit, DC, subsonic, and thermal overload protection

• Gain control security cover prevents misadjustments

• LED indicators for power, signal, and clip

• Detachable rack ears included

• Only 10 kg (22 lb.) for easy racking and shipping

• Selectable subsonic filters: off, 20 Hz, or 50 Hz

INTRODUCTION- Illustrations

Front Panel (gain control security cover removed) 1- Power switch 2- Channel 1 gain control 3- Power “on” indicator

Note! Amplifiers are shipped with the gain controls set at maximum gain (+29 dB) and with gain control security cover installed. See page 10 for security cover removal and installation information.

4- Channel 1 signal and clip indicators 5- Channel 2 gain control 6- Channel 2 signal and clip indicators

Rear Panel 1- DataPort connector 2- Channel 1 RCA input connector 3- Channel 2 RCA input connector 4- Channel 1 XLR input connector 5- Channel 2 XLR input connector 6- Mode switches 7- XLR connector pinout reference chart 8- Channel 1 Speakon® pinout reference chart 9- Channel 1 Speakon output connector 10- Channel 2 Speakon pinout reference chart

11- Channel 2 Speakon output connector 12- Channel 1 binding post output connectors 13- Channel 2 binding post output connectors 14- Cooling air intake vents 15- Remote trigger in/out jacks 16- Remote Trigger pinout reference chart 17- Serial number decal location 18- Mode switch settings reference chart 19- AC power cord entry (IEC inlet)

UNPACKING AND INSPECTION

The SRA amplifier is highly durable and carefully packaged. We recommend you inspect the unit carefully after removing it from the packaging, as occasionally there may be damage due to some unfortunate incident during shipment. Report any damage to the shipping carrier. We recommend saving the carton and packing material in case the unit must be shipped back to your dealer, distributor, or service center. Also note: some freight companies consider damage claims without the original packing materials invalid.

The QSC shipping box should contain:

1- The SRA amplifier 2- This Owner’s Manual 3- Accessory packet containing:

-rack mount ears (2, used for rack mount installation only)

-four adhesive feet (for non-rack mounting installation)

-5/64” hex key (Allen wrench) for gain control security cover removal

-remote on/off (trigger) control cable, 36” long

4- IEC Power Cord

SETUP- Stand-alone Mounting

If the amplifier is to be used “stand-alone” (not mounted in an equipment rack) install the self-adhesive rubber feet on its bottom surface. The self-adhesive rubber feet are included with the amplifier.

To install the self-adhesive rubber feet:

1- Turn the amplifier upside down on a soft, nonabrasive surface.

2- Peel the backing paper off of each rubber foot and place near each of the four corners of the chassis bottom

3- Press firmly to activate the pressure sensitive adhesive.

4- Turn the amplifier back over so that the rubber feet rest on the supporting surface.

SETUP- Stand-alone mounting (cont’d.)

Dimensions shown are

useful for non-rack

mount installations.

Rack Mounting

Rack mounting the amplifier

Rack mounting is optional. The amplifier fits a 483 mm (19”) width equipment rack.

To rack mount the amplifier:

1- Install the rack mount ears (see below and the following page for details).

2- Position the amplifier in the equipment rack and secure all four corners of the front panel using

machine screws and washers. The size and thread type of the screws is determined by the equipment rack. Washers should be large enough to prevent the screw head from slipping into the rack ear mounting hole. Plastic washers will help prevent the screws from scratching the front panel.

To attach the rack mounting ears, you will need:

1- A #2 size cross point (Phillips) screwdriver.

2- The rack mount ears included with you SRA amplifier.

Continued, top of next page.....

SETUP- Rack Mounting

Continued, from previous page.....

Attaching the rack mount ears:

1- Remove the two screws holding the front panel end cap

in place. Use a #2 cross point screwdriver (Phillips).

2- Place the rack mount ear as shown, aligning it so the screws will go back into their original locations.

3- Insert the screws and tighten being sure to keep the rack mount ear properly aligned.

4- Repeat procedure for the other side

When installing equipment into a rack, distribute the units evenly. Otherwise, hazardous conditions may be created by an uneven weight distribution.

Dimensions for rack mount installations.

Note: Some dimensions are taken from

the front surface of the rack rail.

SETUP- Supporting the rear of the amplifier

Supporting the rear of the amplifier

If transporting the amplifier in a loaded equipment rack, support the rear of the amplifier using rear rack ears. They are optional and not included with the amplifier. QSC’s Technical Services Group has the rear rack ear kits for sale.

The rear ear kit mounts two ways (shown below):

- using machine screws to secure the amplifier to the rear ears

- using a post and the notch to support the rear.

Refer to the instructions that come with the optional rear rack ear kit! Information is for reference only.

Method 1- The amplifier is

first installed and secured to the front rack rails. The rear ears are then secured to the amplifier and to the rails using screws.

Method 2- The post is installed on the rear ears, then the ears attached to the rack using screws. The amplifier is then installed from the front of the rack and the notch in the amplifier’s rear chassis tab slides over the post.

SETUP- Removing the Gain Control Security Cover

Gain Control Security Cover

The amplifier is shipped with its gain controls at their maximum setting of +29 dB and a security cover installed to prevent tampering.

To adjust gain settings, remove the cover. Reinstall the cover to prevent unintentional changes.

Removing the Security Cover

1- Using a 5/64” (or 2 mm) hex key, remove the

cover’s retaining screw and set it aside.

Cover retaining tab detail (left) and corre-

sponding chassis retaining slot (right).

2- Insert the end of the hex key tool into the

cover’s screw hole and pull/swing the plate out as shown.

3- Once the right side has been withdrawn from its retaining slot, pull the gain control lockout plate out from the front panel recess.

(continued, following page)

SETUP- Installing the Gain Control Security Cover

4- Gain controls exposed for adjustment.

Installing the Gain Control Security Cover

1- Slide the cover into the front panel recess.

Push it fully to the right and against the front panel. You should feel the cover’s retaining tabs drop into the slot in the front panel.

2- While lightly pressing the right side of the cover against the chassis, use the hex key tool (inserted into the plate’s screw hole) to slide the cover to the left until the LEDs line up with the cover’s holes. Continue to lightly press the cover against the chassis while you insert the cover’s retaining screw and secure the screw. Fully tighten the retaining screw.

SETUP- Cooling Requirements

Cooling Air Inlet and Exhaust Vents

The amplifier has a rear-mounted variable-speed fan. Speed is determined by the temperature of the amplifier’s internal heat sink assembly.

Cooling air enters the rear of the amplifier and exhausts from the front vents.

If mounting in an enclosure, be certain not to restrict airflow.

Warm air exhausts through the front panel vents.

Amplifier

Cool air is pulled into the rear of the amplifier.

Fan

Equipment Rack

Do not obstruct cooling air vents!

+ 28 hidden pages