Ahuja CS 663T Ceiling Speakers

Ahuja CS 663T Ceiling Speakers

The Ahuja CS-663T is a flush-mount ceiling speaker for 100V line public address systems. It uses a 6 inch (15.24 cm) full range driver rated at 6W RMS, with a built-in line matching transformer whose power taps of 6W, 3W and 1.5W are selected by changing the receptacle on the transformer. Ahuja specifies a frequency response of 60 to 15,000Hz and a sensitivity of 92dB at 1W/1m, figures aimed squarely at clear speech and background music coverage. An aesthetically designed plastic grille covers the driver, and spring loaded clamps make mounting in a ceiling cut-out quick. Ahuja positions the model for hotels, shopping malls and offices.

Key features

• 6 inch (15.24 cm) full range driver in a flush ceiling format
• 6W RMS input power on a 100V line
• Power taps of 6W, 3W and 1.5W, selected at the line matching transformer
• Frequency response 60 to 15,000Hz; sensitivity 92dB at 1W/1m
• Spring loaded clamps for fast mounting in a ceiling cut-out
• Plastic grille that sits discreetly in finished ceilings

Why 100V line, and why taps matter

Large buildings need even, intelligible sound in many rooms at once, without running heavy speaker cable back to a central amplifier for every loudspeaker. A 100V line system solves this by distributing audio at high voltage over long, thin cable runs, with each speaker drawing only its tapped share of power through its own matching transformer. The tap selection is the installer’s volume planning tool: set a speaker to 6W where the room is large or noisy, 3W for a typical office or corridor, and 1.5W where only gentle background level is wanted. Add up the taps of every speaker on a line and keep the total within the amplifier’s rating, with headroom to spare.

Coverage and placement

Ceiling speakers work best as a planned grid rather than as single loud units. Evenly spaced CS-663T speakers, each running at a modest tap, produce a consistent level across a floor, so announcements stay intelligible everywhere without any one seat being blasted. Speech clarity benefits from the 92dB sensitivity, which delivers useful output from very little amplifier power, and the 60 to 15,000Hz response covers the full speech band plus the body of background music. In practice, spacing speakers so their coverage overlaps gently at ear level below the ceiling gives the smoothest result for paging and music alike.

Installation notes

The speaker mounts flush in a ceiling cut-out and is held by its spring loaded clamps, so fitting is fast once the cut-out is made to the required size; the unit measures 230mm in diameter by 75mm deep and weighs 670g, which the installer should confirm against the ceiling void and tile before fitting a full floor of them. Select the power tap at the transformer before the speaker goes up, wire in parallel along the 100V line observing polarity, and switch the amplifier off while wiring. Final tap adjustments are easier with a walk-through test at working volume after installation.

For distributed paging and background music in commercial interiors, the CS-663T is the straightforward Ahuja ceiling speaker: 6W, three taps, quick clamps, and nothing in the ceiling to look at but a neat grille.