ART SLA-4 User Manual

SLA-4
FOUR CHANNEL STUDIO LINEAR AMPLIFIER
USER’S GUIDE
2
The ART SLA-4
IMPORTANT SAFETY INSTRUCTIONS - READ FIRST ....................... 4
INTRODUCTION ..................................................................................... 5
INSTALLATION ................................................................................... 6-7
AC Power Hookup Audio Input Connections Speaker Load Safety Precautions Security Cover
............................................................................... 6
..................................................................... 6
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......................................................................................7
CONTROLS AND INDICATORS – FRONT PANEL ............................8-9
Power Switch ....................................................................................... 8
Channel Level Controls Signal Indicator LED Clip Indicator LED
............................................................................... 8
Protect Indicator LED
....................................................................... 8
........................................................................... 8
.......................................................................... 9
REAR PANEL CONNECTIONS
Inputs .................................................................................................
¼” Input Jacks Euroblock Barrier Strips
................................................................................... 10
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...................................................... 10-13
10
Stereo / Bridge Amp Mode Switches ................................................ 11
Output Binding Post
SmartFan™ .......................................................................................
Fuse ..................................................................................................
..................................................................... 11-12
12 13
AC Power Input ................................................................................. 13
OPERATION ....................................................................................
14-15
WARRANTY INFORMATION ............................................................... 16
SERVICE ...............................................................................................
17
SLA-4 SPECIFICATIONS
..................................................................... 18
3

IMPORTANT SAFETY INSTRUCTIONS – READ FIRST

This symbol, whenever it appears, This symbol, wherever it appears, alerts alerts you to the presence of uninsulated you to important operating and maintenance dangerous voltage inside the enclosure. Voltage instructions in the accompanying literature. that may be sufficient to constitute a risk of shock. Please read manual.
Read instructions: Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment. Follow operating instructions printed in this user guide.
Do not open: There are no user serviceable parts inside. Refer any service work to qualified technical personnel only.
Power sources: Only connect unit to mains power of type marked on rear panel. Power source must provide a good ground connection.
Power cord: Use the power cord with sealed mains plug appropriate for your local mains supply as provided with the equipment. If the provided plug does not fit into your outlet consult your service agent. Route the power cord so that it is not likely to be walked on, stretched or pinched by items placed upon or against.
Grounding: Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the ground connection on the power cord.
Ventilation: Do not obstruct the ventilation slots or position the unit where the air required for ventilation is impeded. If the unit is to be operated in a rack, case or other furniture ensure that it is constructed to allow adequate ventilation.
Moisture: To reduce the risk of fire or electrical shock do not expose the unit to rain, moisture, or use in damp or wet conditions. Do not place a container of liquid on it, which may spill into any openings.
Heat: Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard. Locate the unit away from any equipment, which produces heat such as: power supplies, power amplifiers and heaters.
Environment: Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink spillage and smoke, especially that associated with smoke machines.
Handling: To prevent damage to the controls and cosmetics avoid rough handling and excessive vibration. Protect the controls from damage during transit. Use adequate padding if you need to ship the unit. To avoid injury to yourself or damage to the equipment take care when lifting, moving or carrying the unit.
Servicing: Switch off equipment and unplug the power cord immediately if it is exposed to moisture, spilled liquid, objects fallen into opening, the power cord or plug becomes damaged during a lightning storm, or if smoke odor or noise is noted. Refer servicing to qualified technical personnel only.
Installation: Install the unit in accordance with the instruction printed in the user guide.
4

INTRODUCTION

Thank you for purchasing the ART SLA-4 Four Channel Studio Linear Amplifier and congratulations, you now own one of the most versatile linear audio amplifiers available. Offering a superb level of sound quality, the SLA­4’s clean and powerful linear circuitry combined with a straightforward user interface quickly and easily delivers the power you need for professional audio applications.
Features:
• Extremely Low Noise, Discrete Linear Design
• 4 x 100 Watts/Ch @ 8 Ohms, 140 Watts/Ch @ 4 Ohms
• 2 x 200 Watts/Ch @ 16 Ohms, 280 Watts/Ch @ 8 Ohms (bridged)
• 2 x 100 Watts/Ch @ 8 Ohms & 1 x 280 Watts @ 16 Ohms (bridged)
• Toroidal Transformer
• 10 Hz to 40 kHz Frequency Response
• ¼” TRS, and Euroblock Balanced Inputs
• Recessed “Pop Out” Detented Gain Knobs
• Tamper-Proof Faceplate Included
• Multi-way Binding Post Outputs
• Low Profile 1U Rack-Mountable Design
• SmartFan Silent Cooling System
5

INSTALLATION

The SLA-4 may be used in a wide variety of applications from project or professional studio environments to commercial sound installations. Self-contained in a steel and aluminum enclosure, the unit is designed for many years of use. For greater reliability, we recommend that you not place the unit directly under or on top of other sources of heat. It is important that any rack-mountable unit is properly ventilated, and the SLA-4 is no exception.
AC POWER HOOKUP
The SLA-4 has an internal power supply designed to operate at 120 VAC @ 50 to 60 Hz. Units manufactured for use outside of North America have been modified to comply with the required electrical specifications.
AUDIO INPUT CONNECTIONS
Audio connections to the SLA-4 are balanced or unbalanced ¼” [Tip = Hot (+), Ring = Cold (-), Sleeve = (Ground)].
Euroblock connections: can be wired balance or unbalanced. See diagram on page 11
SPEAKER LOAD SAFETY PRECAUTIONS
Warning:
For optimum performance and reliability, do not operate the amplifier with a speaker load of less than 4 Ohms per channel, or any combination of speakers that together are less than 4 Ohms.
Using one speaker per channel, it must be rated at 4 Ohms or greater. When using two speakers per channel, in parallel, they must each be rated at 8 Ohms, or greater.
When in bridge mode, the speaker load should be 8 Ohms, or greater.
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