User manual YAMAHA PSS790E

[. . . ] All full-range loudspeakers are fitted with a self-resetting poly switch that protects the high-frequency driver from damage caused by excessive power. If a loudspeaker cabinet loses high-frequency output, immediately remove power from the unit and wait for two to three minutes. They should allow the poly switch to reset. Re-apply power and check the performance of the high-frequency driver before continuing with the power reduced to a level that does not cause the poly switch to interrupt the signal. [. . . ] On the SW118IV/SW118IVS sub woofer, the Poly Switch protects the woofer and a similar routine should be followed if its output is lost. This product, when used in combination with amplification and/or additional loudspeakers, may be capable of producing sound levels that could cause permanent hearing loss. dO NOT operate at high volume levels or at a level that is uncomfortable. If you experience any discomfort or ringing in the ears, or suspect an hearing loss, you should consult an audiologist. Versions of these speakers are designed for suspension. please consult a qualified engineer for proper hanging techniques. Fly-Ware Model S115IVA, S115IVAS, S115IVA-OAK These speakers are supplied with Fly-Ware rigging hardware installed. The following notes explain how to prepare these speakers for suspension. This material does not explain how to suspend speakers. Do not attempt to suspend any speaker system unless you have received specific training to do so. SPEAKER HANDLES The handles on your speakers are for transportation. The illustration below shows audio connections for a standard setup using two speaker systems. DAISY-CHAINING SPEAKERS Since the speaker systems in this series are equipped with two input terminals that are internally connected in parallel, it is possible "daisy-chain" speakers by connecting the output from the power amplifier to one phone jack, and a second speaker system to the other. all speaker models in this series have a nominal impedance of 8. Since most power amplifiers are designed to provide stable performance at a load impedance of 4 or 8, Yamaha recommends that no more than two 8 speaker systems be daisy-chained together. This will allow the amplifier to operate properly and avoid overheating. PHONE PLUG WIRING The standard input terminals for this unit are 1/4" phone jacks. Caution: Use only unshielded speaker cable with stranded conductors to connect speakers to the speaker terminals on a power amplifier. The use of audio cable not rated as sufficient for the amplifier's maximum output level can create a potential fire hazard. This example shows audio connections for a system using SW118IV or SW118IVS Subwoofers and a PN90 Crossover Network. [. . . ] The use of audio cable not rated as sufficient for the amplifier's maximum output level can create a potential fire hazard. This example shows audio connections for a system using SW118IV or SW118IVS Subwoofers and a PN90 Crossover Network. Do not connect the PN90 between the power amplifiers and the SW118IV, SW118IVS subwoofers, as doing so will damage the equipment. â· Although the PN90 has a standard load impedance of 15 k, it can be used with loads between 7. [. . . ]