Yamaha A15W Owner's Manual - Page 4

■ Subwoofer Parallel-connection The subwoofer A15W features four input/parallel connectors-two 1/4" phone jacks and two Neutrik NL4MP connectors. Use either a phone jack or a Neutrik connector to receive input from your sound system/power amplifier. One of the spare connectors can be used to parallel-connect an additional main speaker (keeping in mind the impedance considerations mentioned below). ■ Impedance Considerations When connecting speakers in parallel be sure to check the rated load impedance of the power amplifier. Most power amplifiers are capable of safely driving speakers with minimum impedance of 8 ohms or 4 ohms. A pair of parallelconnected 8-ohm speakers have a total impedance of 4 ohms. Two 8-ohm speakers can safely be paralleled on one output. 4-ohm speakers, however, should not be parallel-connected with other speakers. These models can be connected in parallel, however, if you are using a power amplifier that can safely drive load impedances of 2 ohms or lower. Check your speaker impedance in the table below. Specifications Model Type LF Speaker Unit HF Frequency Response NOISE* Power Capacity PGM MAX Nominal Impedance Sensitivity Input Connectors Socket Mount Diameter Dimensions (W×H×D) Weight *: EIA RS-426 A10 A12 A15 A12M A15W 2 way Bass reflex Bass reflex 10" cone 12" cone 15" cone 12" cone 15" cone 1" VC, Horn-TW - 65 Hz-20 kHz 60 Hz-20 kHz 65 Hz-20 kHz 50 Hz-200 Hz with the internal low pass filtering 125 W 150 W 200 W 150 W 250 W 250 W 300 W 400 W 300 W 500 W 500 W 600 W 800 W 600 W 1000 W 8 Ω 96 dB SPL (1 W, 1 m) 97 dB SPL (1 W, 1 m) 98 dB SPL (1 W, 1 m) 97 dB SPL (1 W, 1 m) 97 dB SPL (1 W, 1 m) 1/4" phone jack × 1, Neutrik SPEAKON NL4MP × 1 1/4" phone jack × 2, Neutrik SPEAKON NL4MP × 2 35 mm (1 - 3/8") 385 mm × 542 mm × 405 mm × 582 mm × 470 mm× 672 mm × 582 mm × 405 mm × 485 mm × 622 mm × 307 mm 323 mm 375 mm 323 mm 485 mm 13.0 kg 15.5 kg 21.5 kg 15.5 kg 28.0 kg A10/A12/A15 77.5° 102.5° A12M A15W H D W 120° H 30° D W H D W Unit: mm Specifications and descriptions in this owner's manual are for information purposes only. Yamaha Corp. reserves the right to change or modify products or specifications at any time without prior notice. Since specifications, equipment or options may not be the same in every locale, please check with your Yamaha dealer. 4