Digi-Wave 400 Series Tour Guide System for one guide and up to 20

The Williams AV Digi-Wave 400 Series Tour Guide System is a portable communication system for one guide and up to 20 visitors. It allows the guide to address the group through individual receivers using a secure, frequency-hopping wireless connection. Operating in the 2.4 GHz ISM band, the system combines encrypted communication, portable components, individual listening outputs, and a published operating range of up to 900 feet under suitable environmental conditions.

Ideal Use Cases

This model is designed for guided tours and other presenter-led visitor programs where one guide needs to communicate with as many as 20 listeners. It is particularly applicable to mobile walkthroughs in which the guide and visitors move together rather than remain in a fixed presentation area. Individual receivers let each visitor listen through a compatible headphone, earphone, or neckloop connected to the receiver’s 3.5 mm output. The available range also accommodates tours that cover a larger area, although actual performance depends on environmental conditions.

Why Choose This Model

The Digi-Wave 400 system centers on secure digital communication. Its 2.4 GHz FHSS operation uses frequencies from 2402 to 2476 MHz, while the listed security features include 87-bit encryption for 300 Series compatibility, 87+128-bit encryption, an encryption PIN, and a settings lock. These features give tour operators defined options for protecting the group’s audio and controlling device configuration.

The DLR 400 ALK receiver uses two AAA alkaline batteries and provides up to 30 hours of battery life with the specified BAT 010-2 batteries. An automatic sleep mode activates after five minutes without an RF signal from compatible devices. The DLT 400 transceiver uses an integrated 1800 mAh lithium-polymer battery and is rated for up to 16 hours of talk time per charge when operating with one transmit and one receive channel. Approximate charging time is five hours.

Installation and Integration

As a portable tour system, setup focuses on preparing the guide transceiver, distributing the visitor receivers, connecting listening accessories, and confirming the selected group or channel. The receiver LCD reports battery level, RSSI, and group or channel number. The transceiver uses an OLED indicator, a red LED around the Talk button when enabled, and a bi-color status LED at the top.

The DLT 400 provides an internal microphone that is disabled when its microphone jack is engaged. Its 3.5 mm microphone input supplies electret microphone bias and offers adjustable gain across a 63 dB range. USB-C supports adjustable line input and output, while the 3.5 mm TRRS headphone jack supplies 25 mW into 32 ohms. Charging is available through USB-C or the two contacts specified for use with the CHG 412. Receiver compatibility includes the DLR 400 RCH and DLR 400 ALK, with limited compatibility listed for the DLT 300 and DLR 360.

Performance Highlights

The system’s published wireless range is up to 900 feet, or 274 meters, depending on environmental conditions. Receiver specifications include FSK modulation, an internal antenna, a 74 dB A-weighted signal-to-noise ratio, and 0.1% typical total harmonic distortion. Its mono 3.5 mm TRRS output can drive headphones, earphones, or a neckloop at up to 27 mW into 32 ohms.

For the transceiver, RF output is rated at 19 dBm maximum. In tour, interpretation, and hearing-assistance configurations using no more than four microphones, the listed audio frequency response is 100 Hz to 11,500 Hz. Other transceiver modes are rated from 100 Hz to 7,200 Hz. Receiver audio response is listed as 100 Hz to 7,300 Hz in intercom mode and 100 Hz to 11,200 Hz in interpretation and other modes.

What Makes It Different

This configuration brings together capacity for up to 20 visitors, frequency-hopping transmission, multiple encryption controls, and separate power arrangements for the guide and listener devices. The alkaline receivers support field battery replacement, while the guide transceiver provides an integrated rechargeable battery and USB-C connectivity. The listed copolymer carrying case measures 15.7 inches wide by 19.7 inches long by 7.2 inches high externally and weighs approximately 6.6 pounds when empty. Component approvals include FCC, Industry Canada, RoHS 3, CE, WEEE, RCM, ANATEL, KC, and Giteki.

Final Assessment

The DWS TGS 20 400 ALK is suited to organizations that need a portable, one-guide tour system for groups of up to 20 visitors. Its defining advantages are the 2.4 GHz FHSS platform, encrypted operation, up-to-900-foot published range, status displays, and long receiver battery life. A two-year warranty covers component failure and manufacturing defects, subject to the manufacturer’s full warranty terms.