TRA series power amplifier expands on SRA’s concept of right amp for job. These 2RU amplifiers utilize our state of the art technology to create advanced, efficient amplifiers perfect for low impedance, 25V, 70V or 100V installations with modest power requirements. Four models available in two- and four-channel configurations, with power ratings of 75W and 150W per channel at 4 ohms, 70V and 100V. All audio controls of TRA-Series amplifiers are on rear panel or internal. Six-step LED meter for each channel lets you monitor all levels. All TRA amplifiers can drive four or eight ohm loads and 25V or 70V and 100V constant voltage lines simultaneously. Output transformers are internally mounted. 150W models are capable of driving 25V constant voltage lines using direct coupled 4 ohm output.