User manual

Additional Information

This manual has been compiled with great care and is as complete as possible at the date of publication. However, updates to specifications, functionality, or software may have occurred since publication. To obtain the latest version of both the manual and software, please visit the Audac website at audac.eu.

Revision: REV-3.9

Introduction

Compact dual-channel power amplifier

The SCP series comprises a range of extremely powerful, compact dual-channel power amplifiers designed for commercial use. These half 19-inch devices can operate in stereo low impedance or 70/100V bridge mode. Various models are available, catering to a wide array of applications with power ratings ranging from 120W to 1000W, housed within a half 19-inch rack space enclosure.

The amplifier's compact and elegant design, featuring a half 19-inch rack space enclosure, allows for single installation in a 10.5-inch equipment rack or side-by-side mounting (two devices) in a 19-inch equipment rack.

Connections to the WP2xx series input wall panels or volume controllers can be established using the RJ45 connectors located on the back of the SCP.

Equipped with a standby mode switch, the SCP series automatically enters an energy-saving standby mode after a period of inactivity. This feature, combined with its overall energy-efficient design, ensures the SCP meets the high standards of Energy Star certification.

When paired with a suitable pre-amplifier or wall-mounted input panel, the SCP series provides a powerful and comprehensive solution for background music installations.

Precautions

Safety Instructions

• Always keep these instructions. Never throw them away.
• Always handle this unit with care.
• Heed all warnings.
• Follow all instructions.
• Never expose this equipment to rain, moisture, or any dripping or splashing liquid. Never place an object filled with liquid on top of this device.
• Do not place this unit in an enclosed environment such as a bookshelf or closet. Ensure adequate ventilation to cool the unit. Do not block the ventilation openings.
• Do not stick any objects through the ventilation openings.
• Do not install this unit near any heat sources such as radiators or other apparatus that produce heat.
• Do not place this unit in environments with high levels of dust, heat, moisture, or vibration.
• This unit is developed for indoor use only. Do not use it outdoors.
• Place the unit on a stable base or mount it in a stable rack.
• Only use attachments & accessories specified by the manufacturer.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• Only connect this unit to a mains socket outlet with protective earthing connection.
• The mains plug or appliance coupler is used as the disconnect device, so the disconnect device shall be readily operable.
• Use the apparatus only in moderate climates.
• This device can be sold in all EU regions.

Cautionary Symbols

The symbols shown are internationally recognized symbols that warn about potential hazards of electrical products.

• The lightning flash with an arrow point within an equilateral triangle indicates that the unit contains dangerous voltages. [Warning: High Voltage]
• The exclamation point within an equilateral triangle indicates that it is necessary for the user to refer to the user's manual. [Refer to Manual]

These symbols warn that there are no user-serviceable parts inside the unit. Do not open the unit. Do not attempt to service the unit yourself. Refer all servicing to qualified personnel. Opening the chassis for any reason will void the manufacturer's warranty. Do not get the unit wet. If liquid is spilled on the unit, shut it off immediately and take it to a dealer for service. Disconnect the unit during storms to prevent damage.

Servicing and Compliance

Servicing

This product contains no user-serviceable parts. Refer all servicing to qualified service personnel. Do not perform any servicing unless you are qualified to do so.

EC Declaration of Conformity

This product conforms to all the essential requirements and further relevant specifications described in directives 2014/30/EU (EMC) and 2014/35/EU (LVD). All related standards are listed in a Declaration of Conformity (DoC), which can be found in the product's download section on the web-page audac.eu.

Waste Electrical and Electronic Equipment (WEEE)

The WEEE marking indicates that this product should not be disposed of with regular household waste at the end of its life cycle. This regulation is designed to prevent any possible harm to the environment or human health.

This product is developed and manufactured with high-quality materials and components that can be recycled and/or reused. Please dispose of this product at your local collection point or recycling center for electrical and electronic waste. This ensures it will be recycled in an environmentally friendly manner, helping to protect the environment.

Power Supply and Power Cord Requirements

Power supply class I grounding requirements: For protection from fault currents, the equipment must be connected to a grounding terminal. Plug the system power cord into an AC outlet that provides a ground connection. Substitute cords may not provide adequate fault protection. Only use the power cord supplied with this product or an authorized/equivalent replacement.

Safety Notices

• Denmark: Apparatets stikprop skal tilsluttes en stikkontakt med jord, som giver forbindelse til stikproppens jord.
• Finland: Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan.
• Norway: Apparatet må tilkoples jordet stikkontakt.
• Sweden: Apparaten skall anslutas till jordat uttag.

Energy Star Certification

This product qualifies for ENERGY STAR in the "factory default" setting, which is where power savings are achieved. Changing factory default settings or enabling other features may increase power consumption beyond the limits necessary to qualify for the ENERGY STAR rating. Audac aims to help users save energy.

Chapter 1: Connections and Connectors

Connection Standards

The input and output connections for AUDAC audio equipment adhere to international wiring standards for professional audio equipment.

3-Pin Terminal Block

Used for balanced line input connections.

• Left: Signal - (XLR Pin 3)
• Center: Signal + (XLR Pin 2)
• Right: Ground (XLR Pin 1)

[Diagram: Balanced signal input connections]

[Diagram: Unbalanced signal input connections]

RJ45 (Audio): Remote Input Units

Pinout:

• Pin 1: White-Orange (Left channel +)
• Pin 2: Orange (Left channel -)
• Pin 3: White-Green (+24V DC)
• Pin 4: Blue (Not connected)
• Pin 5: White-Blue (Not connected)
• Pin 6: Green (GND)
• Pin 7: White-Brown (Right channel +)
• Pin 8: Brown (Right channel -)

RJ45 (Control): Remote Volume Controller

Pinout:

• Pin 1: White-Orange (Not connected)
• Pin 2: Orange (Not connected)
• Pin 3: White-Green (GND)
• Pin 4: Blue (Variable control voltage 0 ~ 10V)
• Pin 5: White-Blue (+10V)
• Pin 6: Green (+10V)
• Pin 7: White-Brown (Not connected)
• Pin 8: Brown (Not connected)

Chapter 2: Front Panel Overview

Indicator LEDs (VU)

Channel monitoring is facilitated by four indicator LEDs for each channel, providing continuous operational status.

• Green Signal LED: Illuminates when a signal is present.
• -20dB LED: Illuminates when the input signal exceeds the -20 dB level.
• Clip LED: Illuminates when the corresponding channel is operating at its maximum level. For optimal signal-to-noise ratio, this LED should only illuminate at peak levels. When the Clip LED illuminates, the amplifier's output limiter intervenes to prevent distorted "Clipping" sound.
• Protection LED: Illuminates in case of overheating or any other detected fault. No signal will be output when this LED is illuminated. It also illuminates when external mute contacts are activated.

Power Switch

The power switch is used to turn the amplifier on and off. The LED ring around the switch illuminates blue when the power is switched on and orange when switched to standby mode.

Rear Panel Overview

AC Power Inlet with Fuse

The mains power supply (100-240V AC - 50/60 Hz) is connected via this AC power inlet.

Mute Connection

A priority mute contact connection is provided, enabling complete muting of background music upon a contact closure between the 'MUTE' contacts. This is useful for situations involving a separate emergency system requiring background music muting, such as during a fire alarm. Emergency system output contacts can be linked to this input. If a Normally Closed (N.C.) contact trigger is used, a contact bridge must be placed between both Normally Open (N.O.) contact terminals.

[Diagram: Normal open mute contact]

[Diagram: Normal closed mute contact]

Audio Output Connection

Speakers are connected to the terminal block output connector. Depending on the setup, two speakers can be connected in a low impedance stereo configuration, or a single speaker line can be connected in a constant voltage 70/100V bridge configuration. Typical wiring applications are illustrated in the following diagrams.

[Diagram: SCP2xx connected in stereo mode]

[Diagram: SCP2xx connected in bridge mode]

SCP Series Minimum Load Impedance in 4 Ohm Stereo Output Mode

Rear Panel Features (Continued)

SCP Series Minimum Load Impedance in 70 Volt Bridge Mode

SCP Series Minimum Load Impedance in 100 Volt Bridge Mode

Remote Audio Input

A remote audio wall panel (e.g., WP2xx) can be connected to the bottom 'Remote audio' RJ45 connector for providing a remote audio input. This connection can be made using CAT5e (or better) twisted pair cable in a straight pinout configuration. The remote audio input offers stereo balanced line input with a sensitivity of +12dBV and a +24V output for powering external audio panels. The audio signal from the remote audio input is mixed with the amplifier's line inputs.

Remote Volume Control

The top 'Vol Ctrl' RJ45 connector allows for external control of the SCP amplifier's main volume. This connection can be made using CAT5e (or better) twisted pair cable in a straight pinout configuration. The remote volume controller connection is designed for use with a suitable volume controller (e.g., WP200). It functions as a VCA input, operating between 0-10V (linear envelope), and can be integrated with an external 0-10V control system. The amplifier's overall volume is controlled based on the applied control voltage: 10V means no attenuation, while 0V mutes the amplifier. When no external controller is connected, the volume remains at maximum.

Standby Switch

The standby mode of the SCP can be toggled on or off. When enabled, the SCP will automatically enter standby mode after 30 minutes of inactivity (no signal detection).

Stereo- (Lo-Z) / Bridge- (Hi-Z) Mode Switch

This switch allows selection between Lo-Z and Hi-Z modes. When set to Lo-Z stereo, the output is stereo and can drive low impedance speakers. When set to Hi-Z BTL/HPF, both output channels are bridged and can drive high impedance / constant voltage speaker systems. The output voltage can be switched between 70/100V using a corresponding switch, depending on installation requirements. An HPF (70 Hz) is enabled when switched to Hi-Z.

Additional Rear Panel Features

70V / 100V Switch

When switched to Hi-Z mode (STEREO - BTL-HPF), this switch allows selection of the output voltage between 70V and 100V. In Hi-Z mode, the amplifier's CH1 input is used, and the input source should be a mono-summed signal configured on the source side. If using a WP2XX as the source, the wall panel must be set to Mono mode via its rear DIP switch.

Balanced Stereo Line Input

The balanced stereo line inputs utilize 3-pin terminal block connectors. Various types of balanced and unbalanced line-level audio sources can be connected to these inputs, including pre-amplifiers, mixers, and audio sources for spoken messages. A gain control potentiometer is fitted, allowing input sensitivity adjustment within a range of -3 dBV to +7 dBV.

Technical Specifications

SCP206, SCP212, SCP224

SCP230, SCP250

Notes

[Blank section for user notes]