Yamaha S55 Owner's Manual - Page 2
Precautions, Connection, About The Protection Circuit, Specifications - 2 way
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Thank you for choosing the Yamaha S55 speaker system. The S55 is a compact two-way bass-reflex speaker system equipped with a 16 cm (6.5") woofer and a 2.5 cm (1") tweeter. From powerful bass to delicate high-frequency sounds, the system provides well-balanced high quality sound reproduction over the entire frequency range. To obtain maximum performance from your Yamaha speaker system we recommend that you read this operation manual thoroughly. CONNECTION Connect the speaker cables from the input terminals on the rear of the system. The red input terminal on the system should be connected to the output terminal (+) on the power amplifier, and the black output terminal should be connected to the output (-). Incorrect polarity will impair bass sounds, producing an unnatural sound. PRECAUTIONS q Be sure to turn the amplifier power OFF before attempting to connect the speakers. q To avoid distortion and possible damage to the speaker units, never drive the speakers with more than their maximum rated power. q The nominal impedance of the speaker system is 6 Ω. Since the output characteristics of the amplifier vary depending on the load impedance, the load impedance has a tolerance. If you are expanding the speaker system, be sure to observe the range of specified amplifier load impedance. q When two or more speakers are driven by separate power amplifier channels, be sure that all speakers are connected in phase to avoid a loss in output level and sound quality. q This speaker system employs an anti-magnetic design. However, placing it very close to a TV may cause the color of the screen to become uneven. In this case, relocate the system further from the TV. Press the lever ABOUT THE PROTECTION CIRCUIT The tweeter in this speaker system has an internal protection circuit that shuts off the tweeter when an excessive inputsignal is applied. If the tweeter emits no sound (i.e., the sound lacks high frequency content), reduce the volume level of the amplifier immediately. The sound will return automatically in several seconds. SPECIFICATIONS Speaker Unit LF: 16 cm (6.5") Cone HF: 2.5 cm (1") Horn Enclosure Bass reflex Frequency Range 60 Hz-40 kHz Nominal Impedance 6 Ω Sensitivity 90 dB SPL (1watt, 1m) Power Capacity : Noise PGM Max 70 watts 140 watts 250 watts Crossover Freq. 2.5 kHz Protection circuit Automatic return type Connectors Push terminal Dimensions (W × H × D) 370 × 250 × 215 mm Weight 6 kg * Design and specifications are subject to change without notice.