Mackie SA1521 PAIR of Powered Speakers. A beautiful pair of used Mackie SA1521 15 Active Powered PA speakers. They are fuly tested and working and come complete with power cables. These are amazing speakers with tons of crisp highs and lows and feature. 500W built in amplified power. 3dB response: 57Hz - 18kHz. 10dB response: 49Hz - 20kHz. Max SPL long-term: 130 dB. Max SPL Peak: 133 dB. Loop-Through (Parallel with Input): balanced/unbalanced Male XLR. Dimensions: 82cmH x 46cmW x 47cmD.