SLA-4 FOUR CHANNEL STUDIO LINEAR AMPLIFIER USER’S GUIDE
The ART SLA-4 FOUR CHANNEL STUDIO LINEAR AMPLIFIER IMPORTANT SAFETY INSTRUCTIONS - READ FIRST ....................... 4 INTRODUCTION ..................................................................................... 5 INSTALLATION ................................................................................... 6-7 AC Power Hookup ............................................................................... 6 Audio Input Connections ....................................................................
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST This symbol, whenever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure. Voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read manual. Read instructions: Retain these safety and operating instructions for future reference.
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.
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.
SECURITY COVER For commercial installations it may be desirable to set the gain controls on the power amp, and then make them inaccessible to non-qualified operators. This can be accomplished by using the Security Cover Plate that is included with the SLA-4. Simply set the channel level controls to the desired gain settings and press the knobs into the chassis until they lock into their recessed position. Then remove the two small phillips head screws, one on each side of the four channel level controls.
CONTROLS & INDICATORS – FRONT PANEL POWER SWITCH The Power Switch is located on the front of the unit, directly in the center. During initial installation, make sure the level controls for each channel are set to a low volume level before applying power. CHANNEL LEVEL CONTROLS The dials for the four channel level controls are located to the left and right of the Power Switch. When set to zero (fully clockwise), the level is at maximum. The level is reduced as you turn the control counterclockwise.
PROTECT INDICATOR LED The LED will glow when the channels associated with it go into protect mode. In protect mode, the output signal to the speakers will be muted (channel specific). If there is a fault condition at the speaker outputs (due to a severe load or short) the LED will light until the fault is removed. Channels One and Two share a Protect LED, as do channels Three and Four on the SLA-4. The protect lights will also light during power up and down, to indicate that the signal is muted.
REAR PANEL CONNECTIONS It is easy to interface the SLA-4 with a wide variety of equipment. All inputs and outputs are located on the rear panel. Standard ¼” and Euroblock inputs and binding post outputs make patching simple. INPUTS The SLA-4 has two styles of input connections: ¼” TRS and Euroblock. Use these connections to connect the output signal from a mixer, preamplifier, crossover, or EQ to the amplifier. Balanced connections are recommended for cable runs longer than 20 feet.
STEREO / BRIDGE AMP MODE SWITCHES The SLA-4 Amp Mode Switches allow you to choose between Stereo and Bridged Mono Modes. Two separate switches allow you to bridge channels 1 and 2, or channels 3 and 4, or both channel pairs. This maximizes flexibility by allowing the amp to be configured for best utilization in 2, 3, or 4 channel applications. Make sure that power is off and that your speakers are wired appropriately when changing the mode switches.
Spade Connector – Loosen the red and black caps on the binding posts (don’t completely remove). Insert the spade connector into the binding post and tighten the caps down on the spade connector. Be sure that the connection to one post does NOT come in contact with another post. Banana Plug – Insert the banana plugs into the caps of the binding posts.
FUSE The SLA-4 utilizes a (T10A 250v 20mm) 10 Amp fuse. Be sure to replace blown fuses with a fuse of equal rating only. AC POWER INPUT The SLA-4 features an internal power supply. Plug the detachable cable into a standard wall outlet. Be sure that the supplied voltage matches that of the required voltage labeled on your amplifier. Never plug the amp into an outlet that does not match the required voltage of your amplifier. Serious damage could result.
OPERATION Connect source audio material directly into each input channel and set the channel level controls to provide an appropriate level into each channels speakers. NORMAL OPERATION For a typical four-channel setup, connect the source (mixer, eq, etc.) outputs into channels one thru four of the amplifier. Connect your speakers to the outputs on the rear of the amplifier. Be sure that your front level controls are turned down to their lowest level (full counterclockwise).
PROTECTION The SLA-4’s output circuitry is fully protected from short circuits. An ultrasonic network decouples RF from the output and helps keep the amplifier stable with reactive loads. The SLA-4’s external heatsinks do most of the work in getting heat away from the amplifier, in normal operation. A quiet, rear mounted variable-speed fan provides extra cooling of the amplifiers internal circuitry as needed. Normally, at low to moderate signal levels, the fan runs at a low speed idle.
WARRANTY INFORMATION Limited Warranty Applied Research and Technology will provide warranty and service for this unit in accordance with the following warrants: Applied Research and Technology, (A R T) warrants to the original purchaser that this product and the components thereof will be free from defects in workmanship and materials for a period of three years from the date of purchase.
SERVICE The following information is provided in the unlikely event that your unit requires service. 1) Be sure that the unit is the cause of the problem. Check to make sure the unit has the proper power supplied, all cables are connected correctly, and the cables themselves are in working condition. You may want to consult with your dealer for assistance in troubleshooting or testing your particular configuration. 2) If you believe the ART unit is at fault, go to www.artproaudio.com.
SLA-4 SPECIFICATIONS Dimensions Weight Input Connections Output Connections Input Impedance Input Sensitivity Output Power, 8 ohms Output Power, 4 ohms Bridged Output Power, 16 ohms Bridged Output Power, 8 ohms Stable into CMRR Frequency Response Hum and Noise Total Harmonic Distortion (THD) Slew Rate Damping Factor Transformer Type Power Requirements 1.75”H x 19.0” W x 13.5”D 44.5mm x 482.6mm x 190.5mm 19.8 lbs., 9.0kg.
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