CTD-4125

The Crown CTD-4125 is a four-channel ComTech D Series amplifier with Dante inputs and outputs, built-in DSP, and asymmetrical power sharing. With all channels driven equally it produces 125 W per channel, and power sharing lets the channels split the full 500 W in any ratio. A zone with a large speaker cluster and a second zone with one small ceiling pair no longer force a compromise on amplifier sizing.

Outputs switch between Lo-Z and Hi-Z, so the same amplifier handles low-impedance speakers or 70V and 100V distributed lines. Pilot tone and load monitoring watch the speaker lines for faults, and source priority switching moves to a backup input when the primary signal drops, which matters for paging and announcements.

Configuration runs through a web interface from any computer or tablet on the network, with no proprietary software to install, so a technician can commission the system from a browser. The amplifier speaks HARMAN HControl natively to BSS OMNI Processors and AMX MUSE Automation Controllers, and an API is included for third-party control systems. A GPIO interface covers contact-closure functions such as mute and preset recall.

Built-in DSP handles room tuning and speaker tuning and supports custom speaker tunings. Factory JBL SpeakerTunings for select models, including Control 400 Series ceiling speakers, are preloaded.

The chassis is 1RU tall and half-rack width. Mounting hardware is included, so the unit can sit in a rack, under a table, or on a wall: useful in conference rooms, restaurants, and retail spaces where equipment closets are small or missing entirely.