User manual ONKYO M-5000R

[. . . ] Power Amplifier M-5000R Instruction Manual En Introduction WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. WARNING RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. Important Safety Instructions 1. Install in accordance with the manufacturer's instructions. [. . . ] Low Negative-Feedback Design Conventional amplifiers make extensive use of negative feedback (NFB), whereby part of the output signal is re-input in order to improve the S/N ratio across a wide frequency range. However, too much NFB makes a system susceptible to counter-electromotive force from the speakers, resulting in a drop in perceived sound quality. To avoid this, Onkyo focuses on improving the frequency response and reducing distortion, without relying so much on NFB. We use a low negative-feedback design incorporating audiophile-grade, close-tolerance components, to achieve a frequency response, out to 100 kHz. Closed Ground-Loop Circuits If an amplifier's ground potential (voltage) fluctuates during playback, noise is likely to result. In an open-loop circuit design, where all circuits (ire connected to the power supply via a single loop (as on many amplifiers), the noise is compounded. To avoid this, the M-5000R employs a sophisticated closed-circuit design in which each circuit has a separate link to the power supply. This helps to cancel individual circuit noise and keep the ground potential free of distortion. HICC (High Instantaneous-Current Capability) When an amplifier outputs an audio signal, the connected speakers accumulate energy, reflex, and send energy back to the amplifier. The amplifier must then immediately cancel the speakers' reflex energy and instantaneously send out the next signal. The same high current required to achieve this is also necessary to handle speaker impedance, fluctuations, which can force an amplifier to provide four to six times its usual current load. The M-5000R's instantaneous current capability ensures that audio output is not affected by power limitations. Quad Push-Pull Amplification Design with Three-Stage Inverted Darlington Circuitry Three-Stage Inverted Darlington Circuitry brings greater efficiency to the M-5000R power amp by employing a low-NFB design to maintain voltage stability and enhance transient response. Extremely sensitive to oscillations, this circuitry requires very advanced control technology in order to be incorporated into the amplifier. Breaking further new ground, the M-5000R employs two extra transistors for each channel in a "quad push-pull" design that significantly enhances amplification power. Symmetrical Twin-Monaural Construction Power devices for the left and right channels of the M-5000R are aligned symmetrically. Each channel has the same electrical and structural design, and signal pathways are uniform in length. This helps to minimize errors in stereophonic playback. New Circuit Board Construction Rather than being directly connected to the chassis base, the circuit boards inside the M-5000R are cushioned by internal struts and affixed to the front, side, and rear panels. This method of construction prevents vibrations from the chassis from adversely affecting the circuit boards. En 8 Block Diagram En 9 Supplied Accessories Make sure you have the following accessories: Power cord Power cord (1. 8 m/5. 9 ft) . (1) (Plug type varies from country to country. ) Mono mini-plug cable Mono mini-plug cable (1. 8 m/5. 9 ft) . (1) This is used to connect the 12V trigger jacks. * In catalogs and on packaging, the letter at the end of the product name indicates the color. [. . . ] · Make sure the analog audio cable is connected correctly. · Make sure that all audio connecting plugs are pushed in all the way. External Components The 12V trigger does not work. · Make sure the cables are connected to the jacks firmly. The power amplifier contains a microcomputer for signal processing and control functions. In very rare situations, severe interference, noise from an external source, or static electricity may cause it to lockup. [. . . ]