Inspection, Installation, Bridging, Fault Protection

Thank you for your purchase of the Rolls RA280 Power Amplifier. The RA280 is a stereo 80 Watt/channel RMS power amplifier in a standard 2 rack space format. It is intended for professional audio, musical, and studio applications. The unit features 80W per channel RMS into four ohms, 50W per channel RMS into eight ohms, and 150 watts into eight ohms bridged.

The unit also features MOSFET drivers in a voltage and current gain circuit, a one-second input turn on delay, and LED power output meters. The RA280 is built solid and has a painted steel chassis, special high- performance transformers and a fused power line. The MOSFET output stage is fault protected and helps the RA280 forgive output shorts.

INSPECTION

1. Unpack and Inspect the RA280 package

Your RA280 was carefully packed at the factory in a protective carton. Nonetheless, be sure to examine the unit and the carton for any signs of damage that may have occurred during shipping. If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future.

2.Please complete the Warranty Registration Card and return it to the factory.

INSTALLATION

Connect the power cord to an AC power source, connect the input to the signal source and to the RA280 via the RCA or 1/4" input jacks . Speakers may be connected by using 1/4" jacks, or the dual banana posts which are preferred. When using in bridged mode, the banana connectors must be used.

Turn the Volume controls fully counterclockwise (off), and turn on the power switch, the power LED should light. With the program material running, slowing increase the Volume controls until the desired level of sound is present.

We've included the one second turn-on delay to prevent possible speaker damage in case all equipment is on a single power strip.

4A 120V - 2A 230 V
OUTPUT 2	OUTPUT 1	SERIAL NUMBER
	-	BRIDGE NORMAL

		OUTPUT 1	MADE IN U.S.A.			C O R P O R A T I O N
		OUTPUT 1				C O R P O R A T I O N

	+
						CAUTION
						TO REDUCE THE RISK OF ELECTRIC
						SHOCK DO NOT NOT REMOVE LID. NO
MAINS POWER	+			CHANNEL 2 INPUT	CHANNEL 1 INPUT	USER SERVICABLE PARTS INSIDE.
WARNING	+			CHANNEL 2 INPUT	CHANNEL 1 INPUT	REFER SERVICING TO QUALIFIED
WARNING						SERVICE PERSONNEL
For continued prootection against
risk of fire, replace only with		OUTPUT 2
same type and rating of fuse.						WARNING:
	-					To reduce the risk of electric
	-					shock or fire do not expose
						this device to rain or moisture.

RISQUE DE CHOC - NE PAS ENLEVER

BRIDGING

To bridge the RA280, move the Bridging switch to the "Bridge" position. The Channel 1 knob controls the level of the bridged output, Channel 2 knob is inactive.

Connect the input to Channel 1 input, then connect the load to the two positive (red) banana jacks. Make no connections to the black banana jacks. The level meters will both light, and the output power into 8 ohms is the sum of the LEDs that light.

FAULT PROTECTION

The fault protection in the RA280 limits the current to the output stage in the faulted channel and turns on all the LEDs in that channel. This mode is entered whenever the output stage is called upon for too much power, it may also be fooled by impedances lower than four ohms which may cause the output stage to overheat and burn up the MOSFETs.

IMPORTANT: Since the RA280 is convection cooled, the unit radiates heat from the rear and, depending on it's load demand, it may become very hot if drawn upon heavily.

Should the unit need service, contact Rolls directly, obtain a Return Authoriza- tion number (RA Number), and return the unit to us for repair.

SCHEMATIC

RA280 specifications

The Rolls-Royce RA280 is a remarkable engine that exemplifies modern aerospace engineering, specifically designed for use in advanced civil and military aircraft. This turbofan engine is part of Rolls-Royce's strategy to develop high-thrust, fuel-efficient powerplants, meeting the growing demands for performance and sustainability in aviation.

One of the main features of the RA280 is its high bypass ratio, which contributes to both thrust and fuel efficiency. The engine’s design incorporates advanced aerodynamic principles that optimize air flow, enabling better performance while minimizing fuel consumption and emissions. With its lightweight composite materials, the RA280 also offers significant weight savings compared to its predecessors, enhancing the overall efficiency of the aircraft it powers.

The RA280 is equipped with cutting-edge technologies, including the latest in blade design and cooling techniques. Its fan blades are made from advanced composite materials, which provide durability and strength without adding excess weight. The compressor stages utilize a sophisticated multi-stage design, ensuring maximum compressibility of airflow and improved thermal efficiency. Additionally, the high-pressure turbine features advanced cooling and materials technology, allowing the engine to operate at higher temperatures for improved performance.

Another characteristic of the RA280 is its operational flexibility. It supports a wide range of aircraft applications, from regional jets to larger commercial airliners and military platforms. The engine’s modular design facilitates maintenance and repair, reducing downtime and operational costs for airlines and operators. This is vital in a highly competitive industry where efficiency and reliability are paramount.

The RA280 is also equipped with advanced electronic control systems, allowing for precise management of engine performance. This enhances reliability and safety while providing pilots with essential information for optimal operation. These systems are integrated into the broader ecosystem of the aircraft’s avionics, promoting seamless communication between components.

In summary, the Rolls-Royce RA280 is a cutting-edge turbofan engine that stands out for its high bypass ratio, advanced materials, and integrated technologies. With its emphasis on efficiency, flexibility, and operational reliability, the RA280 is poised to play a pivotal role in the future of aviation, supporting both commercial and military needs in an increasingly demanding aerospace landscape.