Summary
A maker's manual for a proprietary 2.4 GHz digital system used for tours, interpretation, intercom and hearing assistance, with its encryption, groups and range.
Key findings
- Describes a digital spread-spectrum system that hops across 2402-2476 MHz at 19 dBm typical output, and says its frequency-hopping algorithm "avoids interference and is a very secure method of communication".
- Gives a range of up to 900 ft (274 m) depending on the environment, with a repeater mode that extends range by up to 50%.
- Has a Hearing Assistance mode with raised tone control; listeners use receivers with headphones, and the manual mentions neckloops for one transceiver model.
- Recommends no more than four groups at once within the same area to prevent interference, with up to 15 channels in use at once; in a venue with two theatres, each may have its own group.
- Offers 87-bit encryption by default and an AES-128 layer on top that requires a four-digit Encryption PIN; devices without the PIN cannot listen, which it suggests for private or high-security functions, and it advises against 0000 or other easily guessed PINs.
- Notes limits: the PIN cannot be used with its AA-battery receiver model, an older receiver model cannot receive encrypted signals, and the series is not backward compatible with its earliest generations.
- Gives an audio frequency response of 100-11,500 Hz in most modes and 100-7,200 Hz in intercom, interpretation and court modes.
Limits
A manufacturer's manual for its own product, without test data; the range and interference claims are the maker's. The system is designed mainly for tours, interpretation and two-way groups, with hearing assistance as one mode. Dated by its 2025 copyright; the file was created on 7 November 2025.
Read the original
williamsav.com/wp-content/uploads/2020/04/Dig-Wave-400-Manual-DLT-400-DW-T410-MAN-241N.pdf
Cited in
- Which radio bands can venue FM and RF systems use, and what limits them?Partly answered
- What works in courtrooms, council chambers and other meeting rooms where speech must be heard by all and kept in the room?Partly answered
Cite this source
Williams AV. Digi-Wave 400 Series User Manual (MAN 241N). 2025. https://williamsav.com/wp-content/uploads/2020/04/Dig-Wave-400-Manual-DLT-400-DW-T410-MAN-241N.pdf (accessed 9 October 2026).
Every finding here cites its source, and who funded each source is labelled. This site does not recommend products. Found an error or a missing study? Suggest a correction.