Getting Started AC Power and Control | Rotel RB-981 instruction

STEREO POWER AMPLIFIER RB-981

Getting Started

AC Power and Control

Thank you for purchasing the Rotel RB-981 Stereo Power Ampli- fier. When used in a high-quality music or home theater system, it will provide years of musical enjoyment.

The RB-981 is a high-power, two-channel power amplifier, provid- ing the highest level of audio performance. Discrete output de- vices, a massive power supply, premium components, and Rotel’s Balanced Design ensure superb sound quality. High current capa- bility allows the RB-981 to drive the most demanding loudspeakers.

Be aware that the RB-981 is capable of high power levels, in ex- cess of 130 watts per channel. Make sure that your speakers can handle the power of the RB-981. If in doubt about your speakers, ask your local Rotel audio retailer for advice.

The RB-981 is straightforward in its installation and operation. If you have experience with other stereo power amplifiers, you shouldn’t find anything perplexing. Plug in a pair of high-quality RCA cables from your preamp into the amplifier inputs, wire up your speakers, and enjoy.

A Few Precautions

Please read this manual carefully. In addition to basic installation and operating instructions, it provides valuable information on various RB-981 system configurations as well as general informa- tion that will help you get optimum performance from your system. Please contact your authorized Rotel audio retailer for answers to any questions you might have. In addition, all of us at Rotel wel- come your questions and comments.

Save the RB-981 shipping carton and all enclosed packing mate- rial for future use. Shipping or moving the RB-981 in anything other than the original packing material may result in severe dam- age to your amplifier.

Fill out and send in the owner’s registration card packed with the RB-981. Also be sure to keep the original sales receipt. It is your best record of the date of purchase, which you will need in the event warranty service is ever required.

Placement

Because of its high power output, the RB-981 may generate con- siderable heat. The heat sinks and ventilation openings in the am- plifier are more than capable of dissipating this heat under normal conditions, but don’t smother your amplifier. There must be ad- equate clearance around the chassis. The ventilation slots in the top cover must be unblocked, and there must be reasonable air- flow around the amplifier. Use common sense when placing the amplifier in a cabinet or when stacking other equipment.

Likewise, remember the weight of the amplifier when you select an installation location. Make sure that the shelf or cabinet can support its considerable bulk. Again, use common sense.

AC Power Input 7

Because of its high power rating, the RB-981 can draw consider- able current. Therefore, it should be plugged directly into a 2-pin polarized wall outlet. Do not use an extension cord. A heavy duty multi-tap power outlet strip may be used if it (and the wall outlet) is rated to handle the current demanded by the RB-981 and all the other components connected to it.

Be sure the power switch on the front panel of the RB-981 is turned off (in the out position). Then, connect the supplied power cord to the AC power outlet.

Your RB-981 is configured at the factory for the proper AC line voltage in the country where you purchased it (either 115 volts AC or 230 volts AC with a line frequency of either 50 Hz or 60 Hz). The AC line configuration is noted on a decal on the back panel.

Note: Should you move your RB-981 amplifier to another country, it is possible to reconfigure your amplifier for use on a different line voltage. Do not attempt to perform this conversion yourself. Opening the enclosure of the RB-981 exposes you to dangerous voltages. Consult a qualified service person or the Rotel factory service department for information.

If you are going to be away from home for an extended period of time such as a month-long vacation, it is a sensible precaution to unplug your amplifier (as well as other audio and video compo- nents) while you are away.

Power Switch 1 and Power Indicator 2

The power switch is located on the front panel of your amplifier. To turn the amplifier on, push the switch in. The LED indicator above the switch will light, indicating that the amplifier is turned on. To turn the amplifier off, push the button again and return it to the out position.

Protection Circuitry 3

The RB-981 features a thermal protection circuit that protects the amplifier against potential damage in the event of extreme or faulty operating conditions. Unlike many designs, the RB-981’s protection circuit is independent of the audio signal and has no impact on sonic performance. Instead, the protection circuit monitors the temperature of the output devices and shuts down the amplifier if temperatures exceed safe limits.

RB-981 specifications

The Rotel RB-981 is a powerful stereo power amplifier that has carved a niche among audiophiles and music enthusiasts since its launch. Known for its combination of solid performance, high build quality, and innovative technology, the RB-981 offers a multitude of features that enhance audio reproduction.

One of the standout characteristics of the RB-981 is its robust output capability. With a power rating of 130 watts per channel at 8 ohms, this amplifier can drive a wide range of speakers with ease, ensuring that dynamic musical passages are delivered with clarity and authority. The dual-mono design further enhances its performance by allowing each channel to operate independently, which minimizes crosstalk and distortion for a more immersive listening experience.

The RB-981 utilizes Rotel's proprietary Class AB amplification technology. This design strikes a perfect balance between the efficiency of Class D and the sound quality typical of Class A amplifiers. The result is a rich, warm sound with excellent detail retrieval across the frequency spectrum. Whether reproducing delicate acoustic instruments or powerful orchestral arrangements, the RB-981 maintains composure and provides a listening experience that is both engaging and satisfying.

Another notable feature of the RB-981 is its high-current capability, which allows it to effectively handle low-impedance loads and dynamic musical transients. This characteristic is crucial for maintaining stability during peaks in performance, ensuring that the audio remains clean and undistorted.

In terms of build quality, the RB-981 is solidly constructed with a chassis designed to minimize resonance and vibration. The amplifier also features extensive internal shielding to protect against electromagnetic interference, further enhancing the sound quality. The hefty transformer and high-quality capacitors ensure that the amplifier has the necessary headroom for demanding audio signals.

For connectivity, the RB-981 offers balanced XLR and unbalanced RCA inputs, allowing versatile integration into various audio setups. This modularity ensures that it can be seamlessly paired with a range of preamplifiers and audio sources.

In summary, the Rotel RB-981 is an impressive power amplifier that successfully combines power, precision, and versatility. Its robust construction, advanced technologies, and high-fidelity sound make it an excellent choice for anyone looking to elevate their audio experience. Whether you're a casual listener or a dedicated audiophile, the RB-981 stands as a testament to Rotel's commitment to performance and quality in audio equipment.