1 set speakers with thick cable. The Polk Audio Atrium 45P is a powered version of the Atrium 45 outdoor speaker, featuring a built-in amplifier in one of the two speakers that powers both channels. Audio Performance Atrium 45P has the following audio specifications: Amplifier: Built-in 50-watt amplifier (25 watts x 2 channels). Frequency response: 60 Hz – 20 kHz. Sensitivity: 89 dB. Drivers: Mid/Woofer: 4.5-inch (11.43 cm) Dynamic Balance mineral-filled polymer driver with rubber surround. Tweeter: 0.75-inch (1.91 cm) metalized polymer composite soft dome tweeter with neodymium magnet. Connections & Controls The Atrium 45P offers flexibility for various audio sources: Inputs: Equipped with both line-level (RCA) and speaker-level inputs via 5-way gold-plated terminal blocks. Local Controls: Includes a volume knob on the front and a stereo/mono switch on the rear. Power: Powered by an external adapter and features a signal-sensitive automatic on/off function. Dimensions: The active speaker measures approximately 9.5" H x 6.25" W x 8.25" D (including bracket). 24,1 cm H x 15,9 cm B x 20,5 cm D Weight: Approximately 2.3 kg each. Mounting: Includes stainless steel/aluminum mounting brackets that allow 90-degree rotation. Carefully shipped insured Pictures are description