AC-JB10-XFMR (formerly AC-FP6- XMR) Add a transformer to any low impedance speaker. 10 Watt 25/70.7/100 volt transformer inside a junction box. 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).