ユーザーズガイド ROLAND SRA-4800

[. . . ] However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: – Reorient or relocate the receiving antenna. – Increase the separation between the equipment and receiver. – Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. [. . . ] * When set to BTL mode, volume is adjusted with the Channel A attenuator. LEVEL Indicators Output is indicated by these 5-step LED level indicators. The Limiter Circuit is activated when the CLIP indicator lights. The CLIP indicator lighting too frequently means that the output levels are too high; adjust the attenuator to attain the proper output level. PROTECTION Indicator This lights when the protection circuits are in operation. When this indicator is lit, sound from the speakers is cut. Stop operation of the equipment, and immediately check the operating conditions. (About the Protection Circuits → p. POWER Indicator This is lit when the power is on. POWER Switch This switches the power on and off. * When turning the power on or off, first turn the attenuator (1) completely counterclockwise (-infinity) before pressing the switch. The fan is activated whenever the temperature of the interior heat sinks exceeds 60 ˚C, and the rotation speed of the fan changes smoothly in response to any change in the temperature. * To ensure adequate cooling capacity, position the amp so that both intake and exhaust vents remain unblocked. 13) 7 Connecting Other Devices Please refer to p. 11. Stereo Connection Channel A and Channel B may operate independently. In this mode, the SRA-4800 functions as a stereo power amp, with 100 watts per channel (at 8 ohms). BTL Connection If you need greater volume, you can connect a single speaker to each SRA-4800. In this mode, Channel A and Channel B are bridged internally by means of a BTL connection. BTL stands for Balanced TransformerLess, and is a method in which the phase of one channel is inverted, and the output taken from the + jack of both channels. This provides approximately double the output voltage modulation, and in the case of the SRA200E allows it to function as a 300 W (8 ohm) monaural power amp. One SRA-4800 connected to two speakers Signal (Right Channel) Signal (Left Channel) Right Speaker Left Speaker One SRA-4800 connected to one speakers Signal ● MODE switch: Set the MODE switch on the rear panel to "STEREO. " ● Connecting input: Connect the input carrying the left signal to the Channel A INPUT connector, and the input carrying the right signal to the Channel B INPUT connector. ● Speaker connections: Connect the speaker for the left channel to the Channel A speaker terminal, and the speaker for the right channel to the Channel B speaker terminal. * Use speaker systems with a total impedance of 4 ohms or higher for each channel. * Take care not to connect speakers to the terminals with the polarity reversed. [. . . ] Box 62, Doha, QATAR TEL: 4423-554 Paul Bothner (PTY) Ltd. 17 Werdmuller Centre, Main Road, Claremont 7708 SOUTH AFRICA P. O. BOX 23032, Claremont 7735, SOUTH AFRICA TEL: (021) 674 4030 ROMANIA FBS LINES Piata Libertatii 1, RO-4200 Gheorghehi TEL: (095) 169-5043 EUROPE AUSTRIA Roland Austria GES. M. B. H. Siemensstrasse 4, P. O. Box 74, A-6063 RUM, AUSTRIA TEL: (0512) 26 44 260 ASIA CHINA Roland Shanghai Electronics Co. , Ltd. 5F. No. 1500 Pingliang Road Shanghai, CHINA TEL: (021) 5580-0800 AUSTRALIA/ NEW ZEALAND AUSTRALIA Roland Corporation Australia Pty. , Ltd. 38 Campbell Avenue Dee Why West. NSW 2099 AUSTRALIA TEL: (02) 9982 8266 RUSSIA MuTek 3-Bogatyrskaya Str. [. . . ]