Digi-Wave transceiver 400 version

Ideal Use Cases

The Williams AV Digi-Wave DLT 400 is a digital spread-spectrum transceiver designed for simultaneous two-way wireless communication. Its listed operating modes include interpretation, tours, and hearing assistance, making it suited to applications where participants need to exchange audio rather than receive a one-way feed. The transceiver operates in the 2.4 GHz ISM band and has a stated range of up to 900 ft (274 m), depending on environmental conditions.

• Interpretation systems using up to four microphones
• Guided tours requiring two-way communication
• Hearing assistance configurations built around compatible Digi-Wave receivers

Why Choose This Model

The DLT 400 combines transmission and reception in a unit measuring 4.22 inches wide, 2.60 inches high, and 0.50 inches deep. It weighs 3.3 oz (94 g), including its internal battery. The 1800 mAh lithium-polymer battery incorporates smart charging and provides up to 16 hours of talk time per charge when operating with one transmit channel and one receive channel. Approximate charging time is five hours.

An automatic sleep mode activates after five minutes without an RF signal from compatible devices. This power-saving function can be turned off through the Advanced Settings when continuous operation is preferred.

Installation and Integration

The transceiver provides several paths for connecting audio and charging equipment. Its internal microphone is available for direct voice input and is automatically disabled when the 3.5 mm microphone jack is engaged. The microphone jack supplies electret microphone bias and offers adjustable gain across a 63 dB range. USB-C supports adjustable line-level input and output as well as charging.

A 3.5 mm TRRS headphone jack delivers 25 mW into 32 ohms. Charging connections include USB-C and two contacts for use with the CHG 412. Compatible receivers include the DLR 400 RCH and DLR 400 ALK. The DLT 300 and DLR 360 are also listed as compatible, although each has some limitations.

Operating status is presented through an OLED indicator. A red LED surrounds the Talk button when it is enabled, while a bi-color LED at the top changes between green and red. These visual indicators provide direct access to talk and device-status information during operation.

Performance Highlights

The DLT 400 operates from 2402 to 2476 MHz using FHSS frequency hopping, FSK modulation, and a maximum RF output of 19 dBm. Its specified signal-to-noise ratio is 73 dB A-weighted at the default receiver volume with microphone input. Total harmonic distortion is rated at 0.1% at 1 kHz using the default volume setting.

For interpretation, tour, and hearing assistance modes using four or fewer microphones, the audio frequency response is 100 to 11,500 Hz at the -3 dB level. Other operating modes have a stated response of 100 to 7,200 Hz. Side tone is set 6 dB below volume, with Off, Low, and High tone settings available.

The specified operating temperature range is 14 to 113 degrees Fahrenheit (-10 to 45 degrees Celsius). The black-and-silver enclosure uses black ABS plastic, providing a clearly defined physical format for portable Digi-Wave configurations.

What Makes It Different

Security options include 87-bit encryption for compatibility with the 300 Series, combined 87-bit and 128-bit encryption, an encryption PIN, and a settings lock. This selection supports both compatibility-focused configurations and installations that require additional control over communication access and device settings.

The DLT 400 also brings its microphone, headphone output, adjustable USB-C line connections, charging interface, OLED, and status LEDs together within one transceiver. Its dual communication role, frequency-hopping operation, and defined receiver compatibility distinguish it from a receive-only device.

Final Assessment

The Williams AV Digi-Wave DLT 400 is a two-way 2.4 GHz wireless transceiver with up to 900 ft of stated range, up to 16 hours of talk time, and flexible microphone, headphone, line-audio, and charging connections. Its encryption choices, OLED interface, automatic sleep mode, and compatibility with multiple Digi-Wave receivers make it a well-specified component for interpretation, tour, and hearing assistance systems.