|Simultaneous High Current / High Voltage Magnetic Field Power Amplifier. Eminently affordable and yet astonishingly powerful, the TFM - 22 and TFM - 25 are designed to drive many popular speaker designs whose overall impedance fluctuations can tax conventional amp designs. Silver seven transfer function modified. 225 W RMS/channel into 8 ohms, 20-20 KHZ with no more than 0.5% THD. 350 what's RMS/channel into 4 ohms, 20-20 KHZ with no more than 0.5% THD. 600 watts bridged mono. TFM - 25 features analog power meters.