Description
RDL TX SERIES POWER AMPLIFIERS
The TX-PA40D is a 'high-efficiency utility amplifier' which drives a pair of 4 or 8 ohm speakers. It is suited to applications where gain is controlled by other equipment, such as projectors with variable audio outputs used in classrooms, boardrooms and video conferencing. A stereo analogue compressor/limiter is included for 'audio fidelity noticeably superior to conventional class D amplifiers with digital limiting'. This can be adjusted so that the limiter alone is used for clipping suppression, or the full compressor/limiter can be used to substantially increase the average output power beyond that of a standard 40W amplifier.
When the limiter is 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 audio is compressed according to three dynamic time constants 'providing aural transparency while maintaining clean, un-clipped, amplified audio for input overloads of up to 20 dB'. The TX-PA40D, with compression, is capable of 'producing average audio output levels and clarity normally expected from stereo amplifiers with a much higher output power rating'.
The front panel has two gold-plated RCA (phono), unbalanced input sockets, each with an associated screw-driver operated, gain-trim control. An input-mode slide switch, selects summed mono mode or stereo and another switch selects 8 or 4 ohms output loading. LEDs shows operation of the compressor-limiter and the presence of power. A detachable terminal block is provided for connection of the two loudspeaker feeds and power from the included inline power supply, which has an IEC AC power input. The module is equipped with both thermal and output short-circuit protection.
Inputs: -10dBV nominal, unbalanced, 10k ohms; -18dBV minimum to cross compressor threshold; +15dBV maximum. Response (note 1): 20Hz - 20kHz, +/- 1dB, 4 or 8 ohms. Distortion (note 1): 0.1% THD+N, 1kHz, 1W , 4 or 8 ohms; 1% ,50Hz - 20kHz, 8 ohms. Noise: 75dB below 20W RMS. Crosstalk: Better than 60dB, 1kHz, no compression. Compressor threshold: Nominally 2 dB below rated output, automatically adjusting attack and release times. Outputs: 20W RMS, 8 ohms, per channel; 15W RMS, 4ohms, per channel. Note 1: Measured at compressor threshold level equalling 12W RMS (8 Ohms) output power. Ambient temperature: 0- 40 degrees C; 20 degrees C recommended. Power source: 24V DC from included power supply, 100-240V C, 50-60Hz, 1.5A. Dimensions: 76 x 48 x 41mm.
Included accessories: Inline AC power adapter with IEC inlet. Please note that a power cable is not included.
Optional accessories: Power cable, see 'AC Mains Power Leads - IEC'. For hardware to mount TX Series modules on surfaces, to panels, to DIN-rails and a rack-mounting panel, see: 'RDL TX Mounting Accessories'.