Stereo Audio Amplifier with Power SupplyThe TX PA40D is the ideal choice in many applications where a high quality, high efficiency utility amplifier is needed to drive a pair of 4 or 8 speakers. It is specifically suited to fixed gain amplification applications where gain is controlled by other equipment. Examples include projectors with variable audio outputs used in classrooms, boardrooms and video conferencing.The TX PA40D features two unbalanced line level inputs on high reliability gold plated phono (RCA) jacks. A front panel recessed gain control trimmer permits setting the desired amplifier output level for each channel. The gain range accommodates the range of typical unbalanced audio signal levels. Each of the two TX PA40D outputs will drive a 4 or 8 speaker or multiple speakers connected to present a 4 or 8 load to the amplifier. The output impedance is switch selectable on the front panel of the module.A front panel switch is provided to sum the audio inputs to mono. In the STEREO mode, the TX PA40D independently amplifies each audio channel, left (L) and right (R). If speaker placement in the specified installation is incompatible with stereophonic amplification, the INPUT MODE switch may be set to SUMMED MONO.The TX PA40D includes a stereo analog compressor/limiter for audio fidelity noticeably superior to conventional class D amplifiers with digital limiting. The input GAIN settings determine whether the limiter alone is used for clipping suppression, or if the full compressor/limiter will be used to substantially increase the average output power beyond that of a standard 40 W amplifier. A red front panel LED flashes when the limiter is preventing output clipping. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics. If the input level is increased so the compressor is active, the LED remains dimly lit between peak flashes. The audio is compressed according to three dynamic time constants
