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The Heil Parametric Receive Audio Unit (PRAS EQ) is a state-of-the-art audio unit that enhances the
internal audio systems of amateur radio, shortwave, commercial, and CB receivers. The PRAS allows radio
operators to modify, shape, and improve the audio output of their receivers using three separate
equalization controls.
Midrange frequencies are the most critical for achieving clear voice articulation in receive audio.
The Parametric Receive Audio Unit allows operators to have unique control over these important frequencies.
First, operators can adjust the parametric midrange filter from 400 Hz through 4 kHz, with the recommended
sweet spot being at 2.5 kHz. In addition, operators can control the presence of these midrange frequencies
plus or minus 15 dB. Combined with a low-frequency filter down to 160 Hz, and a high-frequency filter up to
6 kHz, the Parametric Receive Unit provides operators unparalleled control and quality of their receive
audio.
The PRAS has three audio inputs: standard XLR and 1/8" inputs, and an 8 ohm input that can be used with the
8 ohm speaker output of any receiver.
There are three audio outputs on the PRAS: balanced XLR and 1/4" outputs on the rear panel, and a 1/8"
output on the front panel for recording audio. The PRAS also has two built-in headphone amplifiers with
separate level controls and dual 1/8" headphone outputs.
The PRAS is best when used with the Heil HPS-5 powered speaker (the PRAS must be used with a powered
speaker). But can be used with the speaker of your choice.
Requires 12VDC, comes with 6FT power adapter cable, 2.5mm barrel connector (PRAS side) to Anderson power
pole connectors.
Instruction Manual
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STC Network Systems