The Digi-Wave 400 Transceiver is a digital spread-spectrum (DSS) that can transmit and receive audio simultaneously. It operates in the 2.4 GHz band that offers a portable solution to assistive listening and interpretation applications. Its frequency-hopping algorithm allows the system to continuously switch frequencies, ensuring security and preventing interference.
The Digi-Wave 400 Transceiver allows users to listen and talk to one another wirelessly. It is compatible with the listen-only Digi-Wave 300 Receiver (with limited features) and Digi-Wave 400 Receiver. When pairing one or more Digi-Wave Transmitters and receivers, you can facilitate communication in scenarios such as guided tours, language interpretation, intercom communication, government sidebar communications, and more.
To download firmware updates for your Digi-Wave product, please contact TechBlue.
Features
A Digi-Wave system consists of at least one transceiver (DLT 400) and various combinations of transceivers and receivers (DLR 400 RCH or DLR 400 ALK). Combinations of one or more DLT’s and DLR’s can be used to facilitate different events, depending on what needs to be spoken and what needs to be heard. Typical scenarios include:
- Guided Tours – with one or more tour guides (2-way), with audience participation (2-way), or without audience participation (1-way)
- Language Interpretation – one or more interpreted languages transmitted to audience (1-way)
- Intercom – with up to six people able to speak simultaneously, and even more listening
- Hearing Assistance – featuring boosted audio for improved comprehension
DLT 400
| Dimensions |
4.22″W x 2.60″H x 0.50″D
(107.3 mm x 66 mm x 12.6 mm) |
| Weight |
3.3 oz (94 g) including battery |
| Color |
Black/Silver (Front/Back) |
| Case Material |
Black ABS plastic |
| Battery type |
Lithium Polymer with smart charge built into transceiver; 1800 mAH |
| Battery life |
Up to 16 hrs talk time per charge@ 1ch Tx and 1ch Rx |
| Power Save |
Auto Sleep Mode after 5 minutes if no RF signal from compatible devices (Power can be turned off in Advanced Settings if desired) |
| Charge time |
5 hrs. approx. |
| System Voltages |
OLED 14VDC; RF 5VDC; Logic 3.3 VDC |
| Operating frequencies |
2.4 GHz (ISM band); 2402 – 2476 MHz FHSS |
Audio Frequency response
(-3dB Level) |
Interpretation, Tour, Hearing Asst (≤4 mics): 100 – 11,500 Hz
Other Modes: 100 – 7,200 Hz
|
| SNR |
73 dB (A-weighted, default Rx volume with mic input ) |
| THD |
0.1 % (Default Volume, 1kHz) |
| Microphone input |
Internal microphone (disabled when MIC jack engaged) and 3.5 mm phone jack (sleeve) with electret microphone bias, adjustable gain with 63dB range. |
| Line Input |
USB-C, Adjustable level |
| Headphone Output |
3.5 mm TRRS headphone jack; 25 mW, R 32 ohms |
| Audio Output |
Headphone: Max SSPL 90 111.8dB (EAR 013), 116.8dB (EAR 041)
Line: USB-C, Adjustable level |
| Range |
Up to 900 ft (274 m) (depending upon environmental conditions) |
| Modulation |
FSK |
| RF Output |
19 dBm Max |
| Security |
87-bit encryption (300 Series Compatible), 87+128 bit Encryption, Encryption PIN, Lock for settings |
| Side tone |
-6 dB below volume, tone variation (Off, Low and High settings available) |
| Indicators |
OLED |
| LEDs |
Red LED around Talk button when enabled; Bi-color, changing green and red LED at top |
| Charging Connectors |
USB-C; Two contacts for use with CHG 412 |
| Compatible Receiver |
DLR 400 RCH, DLR 400 ALK, DLT 300 with some limitations and DLR 360 with some limitations |
| Operating Temperature Range |
14º to 113ºF (-10º to 45ºC) |
| Approvals |
FCC, Industry Canada, CE, RoHS 3, WEEE, RCM, ANATEL, KC, Giteki |
| Warranty |
5 years on parts and labor with product registration; 2 years standard without registration. Internal batteries are covered for 1 year and accessories for 90 days, regardless of registration. Visit the Warranty and Registration page for details. |
Warranty
5 years with registration - 2 years standard (90 days for accessories)
What is the DLT 400?
The DLT 400 is the core unit of every Digi-Wave 400 system. It’s a portable digital transceiver that sends and receives audio at the same time, so one unit can be used to talk, listen or both. Use it as the guide or presenter unit in a tour or interpretation system, or give one to each person who needs to speak in a two-way intercom setup.
What can I use it for?
The DLT 400 supports four main uses:
- Guided tours: one-way to listeners, or two-way with multiple guides or audience participation
- Language interpretation: one or more interpreted languages sent to the audience
- Intercom: up to six people talking at the same time, with unlimited listeners
- Hearing assistance: boosted audio for clearer speech
It’s used in houses of worship, classrooms, healthcare facilities, courtrooms (including government sidebar conversations), training sessions and presentations.
What comes in the box?
The DLT 400 has a built-in rechargeable battery. A charger is not included. Order the DW ACC PAC4 single-unit power supply to charge one transceiver, or a CHG 404 (4-bay) or CHG 412 (12-bay) charger to charge several units at once.
How long does the battery last?
The built-in 1800 mAh lithium-polymer battery runs up to 16 hours of talk time per charge. A full charge takes about 5 hours.
What charging options are there?
- DW ACC PAC4: single-unit USB-C power supply with US, UK, Euro and Australia plug adapters
- CHG 404 DW: 4-bay charging station
- CHG 412: 12-bay charging station
- CHG 412 PRO: 12-bay charging station with carry case
What receivers does it work with?
The DLT 400 works with DLR 400 RCH (rechargeable) and DLR 400 ALK (alkaline) receivers. It also works with the older DLT 300 and DLR 360 with some limitations. See the Transmitter/Receiver Compatibility Chart on the product page for details.
How many people can talk at once?
Up to six DLT 400 users can talk at the same time. Any number of DLR 400 receivers can listen.
What is the range?
Up to 900 ft (274 m). Walls, crowds and other 2.4 GHz devices can shorten it.
Is the audio secure?
Yes. The DLT 400 uses digital frequency-hopping spread spectrum in the 2.4 GHz band, with 87-bit encryption (compatible with Digi-Wave 300 Series) and 87+128-bit encryption. An encryption PIN and a settings lock keep unauthorized users out and stop anyone from changing settings.
Does it need a license or frequency coordination?
No. It runs in the license-free 2.4 GHz ISM band. It is approved for FCC, Industry Canada, CE, RCM, ANATEL, KC and Giteki markets.
What microphone can I use?
The DLT 400 has a built-in microphone. Plugging a mic into the 3.5 mm jack turns off the internal mic. The jack supplies power for electret mics and has 63 dB of adjustable gain, so it works with Williams AV headset, lapel and plug-mount mics, including the MIC 449.
Can I hear myself while I talk?
Yes. Side tone lets you hear your own voice in your earphone at 6 dB below the listening volume. You can set it to Off, Low or High.
Can I connect a sound system, laptop or recorder?
Yes. The DLT 400 has a USB-C line input and line output, both with adjustable levels. You can feed in audio from a mixer or laptop, or send audio out to a recorder or sound system.
What earphones or headphones work with it?
Any earphone or headphone with a standard 3.5 mm plug works. That includes the full line of Williams AV earbuds, headphones and the NKL 001 neckloop.
What do the display and lights show?
An OLED screen shows status and settings. A red LED around the Talk button lights up when talk is enabled, and a two-color LED on top changes between green and red to show status.
What happens if I forget to turn it off?
The DLT 400 goes to sleep on its own after 5 minutes without a signal from other units. You can turn this off in Advanced Settings.
How do I update the firmware?
Download DLT 400 firmware v1.4.2 and the Digi-Wave Updater App from the Firmware tab on the product page. For help with updates, contact Williams AV TechBlue support.
Where can I find the manual and setup guides?
The product page includes the Digi-Wave 400 user manual (English and Spanish), a Quick Setup Guide, a Contactless Courtroom Communication Guide, a security features guide, a compatibility chart, the spec sheet and a brochure.
How big and heavy is it?
It measures 4.22″ W x 2.60″ H x 0.50″ D (107.3 x 66 x 12.6 mm) and weighs 3.3 oz (94 g) with the battery. It works in temperatures from 14° to 113°F (−10° to 45°C).
What’s the warranty?
The DLT 400 is covered for 5 years on parts and labor if you register the product (2 years if you don’t). The internal battery is covered for 1 year and accessories for 90 days. Full terms are at williamsav.com/support/warranty-product-registration.
How do I get pricing?
Click “Request More Info” on the product page and the Williams AV team will follow up with a quote.
