SoundTube AC-JB10-XFMR FP6000 Series Transformer J-Box with Rotary Switch10 Watt 25 70. 7 100 volt transformer inside a junction box. Includes 4 position tap switch. Can be added to any low impedance speaker. Tap settings include 10 W, 5 W, 2. 5 W and 1. 3 W (1. 3 W tap not available on 100 V setting). (25 Volt only: 1. 3 W, 0. 7 W, 0. 4 W, 0. 2 W). Specifications Shipping Weight 2. 25 lbs 1. 02 kg Carton Height 3 in 76. 2 mm Carton Length 4. 5 in 114. 3 mm Carton Width 4. 5 in 114. 3 mm