Since 1953, Army HQ Signals Regiment has been laying audio cables and setting sound amplifier systems for the Republic Day parade on Rajpath, New Delhi. These amplifiers are used for live commentary and announcements during the parade. The work for laying audio cable and setting sound amplifiers starts 90 days before the parade. The sound amplifier systems and cable are laid all through the length of 2.5 km on Rajpath, from Vijay Chowk to India Gate. The amplifier system is effective for about 200 metres on both sides of Rajpath.

Earlier, it used to take about four months for doing this job. Thanks to the modern technology, today the entire process has been fine-tuned for better sound results. Overhead cables are being replaced by underground cables and other technical aids have reduced the time involved in this job. Live telecast of Republic Day parade is done by Doordarshan and also broadcast by All India Radio for the public across the country. But for the spectators who throng the venue to watch the parade commentary is broadcast through a PA equipment which includes 116 amplifiers, 20 loudspeakers, eight CD players and eight cassette decks. The success of the event itself tells the story of hard work done by the regiment.