Audio T Verdict
The Lyngdorf TDAI-3400 is the flagship model in the company’s range of two-channel streaming amplifiers, combining formidable power with advanced digital processing and exceptional system flexibility.
Its fully digital amplifier delivers 200W per channel into 8 ohms and 400W into 4 ohms, with up to 40A of current available for demanding loudspeakers and large musical peaks.
RoomPerfect measures the interaction between the loudspeakers and the listening room, improving bass control, imaging and consistency while preserving the underlying character of the speakers.
AirPlay 2, Spotify Connect, TIDAL Connect, Qobuz Connect, Roon Ready, internet radio and local network playback are joined by an extensive range of digital inputs, including high-resolution USB-B audio.
Optional HDMI 2.1 and high-end analogue modules add television, video-source, balanced analogue and MM phono connectivity, making the TDAI-3400 one of the most adaptable high-performance amplifiers available.
Lyngdorf TDAI-3400 Flagship Streaming Amplifier with RoomPerfect
The Lyngdorf TDAI-3400 is a two-channel integrated streaming amplifier and audio processor designed for high-performance music systems.
It combines Lyngdorf’s fully digital amplification, RoomPerfect room correction, advanced bass management, extensive music streaming and comprehensive analogue and digital connectivity.
The amplifier produces 200W per channel into 8-ohm loudspeakers and 400W into 4-ohm loads, with a maximum output current of 40A.
Loudspeakers Are Required
The TDAI-3400 includes music streaming, source selection, volume control and two channels of amplification, but it does not include loudspeakers.
Suitable passive loudspeakers and speaker cables will be required. Television and turntable connectivity may also require the appropriate optional module.
Fully Digital Amplification
TDAI stands for True Digital Amplifier Integrated.
Digital music signals remain within the digital domain through the processing and volume-control stages, with the amplifier’s switching output architecture driving the loudspeakers directly.
This removes several analogue conversion stages and signal paths found in conventional amplifier designs, helping reduce noise, hiss, crosstalk and distortion.
What Happens to Analogue Sources?
Signals connected through the analogue inputs are converted into the digital domain so that RoomPerfect, Voicings, bass management and volume control can be applied.
Output-Stage Volume Control
The TDAI-3400 controls listening level through the amplifier’s output stage rather than simply reducing the resolution of the incoming digital music signal.
This approach is designed to preserve dynamic range and musical detail across a wide range of listening levels.
Volume can be adjusted using the front control, included remote, My Lyngdorf app or a suitable external control system.
200W into 8 Ohms and 400W into 4 Ohms
The amplifier is rated at 200W per channel into 8-ohm loudspeakers and 400W per channel into 4-ohm loads.
Its maximum output current of 40A provides the control and dynamic headroom required by many larger, less sensitive or more electrically demanding loudspeakers.
This makes the TDAI-3400 particularly suitable for larger rooms and systems where high listening levels or wide musical dynamics are important.
Power Is Only Part of System Matching
Loudspeaker sensitivity, nominal impedance, minimum impedance, room size, listening distance and preferred volume should all be considered alongside the amplifier’s power rating.
RoomPerfect Room Correction
RoomPerfect measures the main listening position and additional locations around the room to understand how the loudspeakers interact with their surroundings.
It is designed to reduce unwanted room effects while retaining the intended tonal character of the loudspeakers rather than forcing every system towards the same generic target response.
The required RoomPerfect microphone, stand, cable and mini-jack adaptor are included.
Focus and Global Listening
Focus mode prioritises the calibrated main listening position for precise stereo listening from a chosen seat.
Global mode provides a more consistent tonal balance across a wider listening area, making it useful when several people are listening or music is playing throughout the room.
Additional Focus positions can also be created for different seats or listening areas.
RoomPerfect Does Not Replace Good Setup
Sensible loudspeaker placement, suitable supports, secure connections and correct system configuration remain important.
RoomPerfect should be considered the final stage of system optimisation rather than a substitute for careful installation.
Advanced Bass Management
The TDAI-3400 includes digital crossover, level and delay controls for integrating loudspeakers, subwoofers, boundary woofers and external power amplifiers.
High-pass and low-pass filters can be configured according to the capabilities of the connected loudspeakers and bass system.
The digital crossover provides three individual output settings, allowing the amplifier to support a wide variety of stereo, subwoofer and bi-amplified system arrangements.
Complex Systems Require Careful Configuration
Crossover frequencies, filter slopes, delays, output routing and levels must be configured correctly before carrying out the RoomPerfect calibration.
Seek specialist advice when integrating multiple subwoofers, boundary woofers or external power amplifiers.
32 Custom Voicings
The TDAI-3400 can store up to 32 adjustable Voicings for tailoring the overall tonal balance of the system.
Each Voicing can contain up to eight filters with adjustable gain and Q.
Different settings can be created for music, television, speech, late-night listening, particular sources or individual recordings.
RoomPerfect and Voicings Perform Different Jobs
RoomPerfect addresses the interaction between the loudspeakers and the room.
Voicings apply deliberate tonal adjustments selected by the listener after the room calibration has been completed.
Pre-Equaliser and Intersample Clipping Correction
The Pre-Equaliser allows additional signal correction to be applied before the main RoomPerfect and Voicing processing.
Intersample Clipping Correction helps address digital recordings whose reconstructed signal peaks may exceed the nominal maximum digital level.
An 18Hz subsonic filter with a 24dB-per-octave slope is also provided for reducing unwanted very-low-frequency information.
Built-In Music Streaming
The integrated media player supports AirPlay 2, Spotify Connect, TIDAL Connect, Qobuz Connect, Roon Ready, internet radio and compatible DLNA or UPnP music libraries.
Music can also be played from a compatible USB storage device connected to one of the rear USB Type-A sockets.
The amplifier receives network streams directly, allowing the controlling phone, tablet or computer to be used as an interface rather than remaining in the audio signal path.
Qobuz Connect
Qobuz Connect allows music to be selected from the Qobuz application and played directly through the TDAI-3400.
The amplifier receives the stream from the service through its own network connection while the phone, tablet or computer acts as the controller.
A suitable Qobuz subscription and reliable network connection are required.
TIDAL Connect and MQA
TIDAL Connect allows playback to be controlled from the TIDAL application while the TDAI-3400 receives the stream directly.
The integrated media platform also includes an MQA Core Decoder for compatible MQA-encoded files and sources.
Available formats and resolutions depend on the streaming service, subscription and original recording.
Spotify Connect
Spotify Connect allows music to be controlled from the Spotify application without continuously routing the audio through the controlling device.
The TDAI-3400 appears as an available playback device when it is connected to the same network and correctly configured.
A suitable Spotify account is required.
AirPlay 2
AirPlay 2 provides wireless network playback from compatible Apple devices and applications.
The TDAI-3400 can also be included within a suitable AirPlay 2 multi-room system.
Performance and available resolution depend on the source application, Apple device and network.
Roon Ready
Roon Ready certification allows the TDAI-3400 to operate as an endpoint within a suitable Roon system.
Roon can combine locally stored music with supported streaming services while providing extensive artist, album and recording information.
A separate Roon Server and subscription are required.
Internet Radio and Local Music
Internet radio is available through the integrated vTuner service.
Compatible music stored on a DLNA or UPnP network server can be accessed through the built-in media player.
Local files can also be played from a compatible USB storage device.
Wired Ethernet and Wi-Fi
An RJ45 Ethernet connection provides wired access to streaming services, app control, browser-based setup and software updates.
Built-in 802.11n/ac Wi-Fi allows the TDAI-3400 to be installed where a wired network connection is impractical.
A wired network connection is generally recommended where possible for the greatest reliability.
Bluetooth Is Not a Music Input
Bluetooth is specified for the included remote control and Bluetooth Low Energy functions.
For music playback, use one of the supported network streaming services or a suitable wired input.
High-Resolution USB-B Audio
The USB-B input provides a direct digital connection for a compatible computer or other USB audio source.
It supports PCM signals at up to 32-bit/384kHz, alongside DXD, DSD64 and DSD128.
A suitable driver may be required when using certain Windows computers, while the source application and cable must support the selected audio format.
AES/EBU Digital Input
A balanced AES/EBU input accepts compatible PCM signals at up to 24-bit/192kHz.
AES/EBU is commonly found on professional and high-end digital audio equipment and uses a balanced XLR connection.
It can provide useful resistance to externally induced interference, particularly over longer cable runs.
Coaxial and Optical Digital Inputs
Two coaxial S/PDIF inputs accept compatible PCM signals at up to 24-bit/192kHz.
Three optical Toslink inputs support compatible PCM signals at up to 24-bit/96kHz.
These connections are suitable for CD transports, televisions, streamers and other digital sources configured to output stereo PCM.
Use Stereo PCM from Video Sources
The TDAI-3400 is a two-channel amplifier and is not a Dolby Digital or DTS surround sound decoder.
Set connected televisions, disc players and games consoles to output compatible stereo PCM audio.
Two Standard Analogue Inputs
Two stereo RCA line inputs are provided for sources such as a CD player, tuner, cassette deck or external phono stage.
The maximum quoted input level is 4V RMS before reaching 0dBFS within the analogue-to-digital conversion stage.
Input names, sensitivity and behaviour can be configured through the browser-based setup interface.
No Standard Phono Input
The standard TDAI-3400 does not include a built-in phono stage.
A turntable requires a suitable external phono stage or the optional high-end analogue input module.
Balanced and Unbalanced Analogue Outputs
The TDAI-3400 provides both a stereo RCA output and a balanced stereo XLR output.
These can be configured for suitable subwoofers, active loudspeakers, an external power amplifier or a more complex crossover arrangement.
Balanced XLR connections provide improved resistance to externally induced noise over longer cable runs.
Coaxial Digital Output
A coaxial digital output provides a fixed 24-bit/96kHz signal for a compatible external DAC, recorder or power amplifier with a suitable digital input.
This is particularly useful when integrating a Lyngdorf SDA-2400 power amplifier while keeping the music signal in the digital domain.
Output routing, level control and crossover settings should be configured according to the connected system.
Headphone Output
A 3.5mm headphone socket is provided for personal listening.
The selected source, streaming platform, RoomPerfect processing and volume control remain available during headphone use.
Headphones with unusually high power requirements may still benefit from a separate dedicated headphone amplifier.
Optional High-End Analogue Input Module
The optional high-end analogue module adds a dedicated MM phono input, two additional stereo RCA inputs and one balanced stereo XLR input.
The sensitivity of each module input can be increased by up to 24dB, helping make suitable use of the analogue-to-digital converter’s available headroom.
The first 6dB of additional gain is handled through gold-plated relays.
The Phono Stage Is Optional
The MM phono input is only available when the high-end analogue module is installed.
The module is a separately purchased upgrade and is not part of the standard TDAI-3400 specification.
Moving-Magnet and High-Output Cartridges Only
The optional phono stage is designed for moving-magnet and suitable high-output cartridges.
A conventional low-output moving-coil cartridge requires an appropriate external phono stage or step-up device.
Optional HDMI 2.1 Module
The optional HDMI 2.1 module adds two HDMI source inputs and one HDMI input and output connection with ARC, eARC and CEC integration.
It supports compatible video signals at up to 8K50 or 8K60 and 4K100 or 4K120.
Compatible PCM audio signals are supported at up to 24-bit/192kHz.
Gaming and HDR Support
The optional HDMI module supports Variable Refresh Rate and Auto Low Latency Mode with compatible games consoles, computers and displays.
Static and dynamic HDR video can also pass through the module, subject to support from the source, display and connected content.
HDCP 2.3 content protection is provided for suitable premium video sources.
The Standard Amplifier Does Not Include HDMI
HDMI inputs, video passthrough, ARC and eARC require the separately available HDMI 2.1 module.
Confirm which version of the TDAI-3400 is being ordered before planning television or video-source connections.
The Entire HDMI Chain Must Be Compatible
The source, amplifier, television or projector and every HDMI cable must support the selected resolution, frame rate and bandwidth.
Long cable runs may require certified active or optical HDMI cables.
Front Display and Controls
The front panel combines a graphic text display with rotary controls for volume and menu navigation.
Input, volume and operating information can be viewed without requiring a phone, tablet or computer.
The supplied remote provides conventional access to frequently used functions.
My Lyngdorf App
The My Lyngdorf app provides control from a compatible iOS or Android phone or tablet.
Source selection, volume, RoomPerfect settings, Voicings, internet radio and compatible streaming functions can be accessed through its visual interface.
The app layout can be personalised to prioritise frequently used controls and sources.
Browser-Based Setup
A web interface provides access to the detailed setup menus from a computer, tablet or phone connected to the same network.
Inputs, outputs, digital crossover settings, RoomPerfect measurements, Voicings and system behaviour can all be configured through the interface.
The completed system settings can be backed up to a suitable SD card.
Custom-Installation Control
IP control and a DB9 RS-232 connection support integration with suitable custom-installation control systems.
The TDAI-3400 is also compatible with an appropriate Control4 driver.
An infrared and Bluetooth Low Energy remote control is included.
Freestanding or Rack Installation
The TDAI-3400 measures approximately 450mm wide, 105mm high and 360mm deep, including its rear connections.
It weighs approximately 8.2kg and is finished in matte black.
The amplifier can be installed freestanding or within a suitable rack using the optional mounting hardware.
Allow Space for Ventilation
The TDAI-3400 has a quoted heat-dissipation value of approximately 270 BTU.
Do not cover its ventilation openings or install it immediately beside equipment that produces substantial heat without providing suitable airflow.
Lyngdorf TDAI-2210 or TDAI-3400?
Choose the TDAI-2210 When
- 210W into 4 ohms meets the system requirements
- A smaller cabinet is preferable
- A full-colour touchscreen is important
- USB-C connectivity is useful
- One optional expansion module is sufficient
Choose the TDAI-3400 When
- Maximum amplifier power and current are required
- Demanding loudspeakers are being used
- 32-bit/384kHz USB-B audio is important
- More standard digital inputs are required
- Both analogue and HDMI upgrade options may be useful
The Lyngdorf TDAI-2210 retains RoomPerfect and Lyngdorf’s fully digital amplification within a smaller and more affordable amplifier.
Lyngdorf TDAI-1120 or TDAI-3400?
Choose the TDAI-1120 When
- The smallest possible cabinet is required
- 60W into 8 ohms suits the loudspeakers and room
- A built-in MM phono stage is important
- Standard HDMI eARC is required
- A simpler compact system is preferred
Choose the TDAI-3400 When
- Far greater output power is required
- Larger or more demanding loudspeakers are being used
- High-resolution USB-B audio is important
- Advanced crossover and output flexibility are needed
- Optional analogue and HDMI expansion is useful
The Lyngdorf TDAI-1120 provides the core RoomPerfect and streaming experience within a significantly smaller amplifier.
Lyngdorf Products and Audio T Guides
Key Features
- Flagship two-channel streaming amplifier
- Fully digital amplification
- 200W per channel into 8 ohms
- 400W per channel into 4 ohms
- 40A maximum output current
- Output-stage volume control
- RoomPerfect room correction
- Focus and Global listening modes
- RoomPerfect microphone included
- Microphone stand and cable included
- Advanced bass management
- Digital crossover with three output settings
- 32 adjustable Voicings
- Up to eight filters per Voicing
- Pre-Equaliser
- Intersample Clipping Correction
- 18Hz subsonic filter
- AirPlay 2
- Spotify Connect
- TIDAL Connect
- Qobuz Connect
- Roon Ready
- MQA Core Decoder
- Internet radio through vTuner
- DLNA and UPnP playback
- Local USB file playback
- Wired Ethernet
- Built-in 802.11n/ac Wi-Fi
- USB-B audio up to 32-bit/384kHz
- DXD support
- DSD64 and DSD128 support
- AES/EBU digital input
- Two coaxial digital inputs
- Three optical digital inputs
- Two standard stereo RCA inputs
- Stereo RCA analogue output
- Balanced stereo XLR output
- Coaxial 24-bit/96kHz digital output
- 3.5mm headphone output
- Optional high-end analogue module
- Optional MM phono input
- Optional balanced XLR input
- Optional HDMI 2.1 module
- Optional 8K60 and 4K120 passthrough
- Optional ARC and eARC
- Optional VRR and ALLM support
- My Lyngdorf app control
- Browser-based configuration
- IP and RS-232 control
- SD card backup
- Infrared and BLE remote included
- Optional rack mounting
- Matte black finish
Frequently Asked Questions
Is the Lyngdorf TDAI-3400 an integrated amplifier?
Yes. It includes source selection, volume control, music streaming, RoomPerfect processing and two channels of power amplification.
How powerful is it?
Lyngdorf specifies 200W per channel into 8 ohms and 400W per channel into 4 ohms.
What is its maximum output current?
The quoted maximum output current is 40A.
Does it include RoomPerfect?
Yes. The RoomPerfect microphone, stand, cable and mini-jack adaptor are included.
Does it include music streaming?
Yes. AirPlay 2, Spotify Connect, TIDAL Connect, Qobuz Connect, Roon Ready, internet radio, DLNA and local USB playback are supported.
Does it support Qobuz Connect?
Yes. Qobuz Connect is included within Lyngdorf’s current streaming platform.
Is it Roon Ready?
Yes. A separate Roon Server and subscription are required.
Does it support AirPlay 2?
Yes. AirPlay 2 is included.
Can I stream music using Bluetooth?
Bluetooth is specified for the remote control and Bluetooth Low Energy functions rather than conventional music streaming.
Does it have built-in Wi-Fi?
Yes. It supports 802.11n/ac Wi-Fi alongside wired Ethernet.
Does it have a USB computer input?
Yes. The USB-B input supports compatible PCM signals at up to 32-bit/384kHz, as well as DXD, DSD64 and DSD128.
Does it have USB-C?
No USB-C audio input is listed within Lyngdorf’s detailed TDAI-3400 connection specification. Computer audio is provided through USB-B.
How many coaxial digital inputs does it have?
It provides two coaxial S/PDIF inputs supporting compatible PCM signals at up to 24-bit/192kHz.
How many optical inputs does it have?
It provides three optical Toslink inputs supporting compatible PCM signals at up to 24-bit/96kHz.
Does it have an AES/EBU input?
Yes. A balanced AES/EBU digital input supporting compatible signals at up to 24-bit/192kHz is provided.
Does it have a digital output?
Yes. A coaxial digital output provides a 24-bit/96kHz signal.
Does it have balanced outputs?
Yes. A balanced stereo XLR output is provided alongside a stereo RCA output.
Does it have a headphone output?
Yes. A 3.5mm headphone connection is provided.
Does the standard model include a phono stage?
No. The MM phono input requires the optional high-end analogue module.
What does the optional analogue module add?
It adds one MM phono input, two additional stereo RCA inputs and one balanced stereo XLR input.
Can the optional phono stage be used with a moving-coil cartridge?
A conventional low-output moving-coil cartridge requires a suitable external phono stage or step-up device.
Does the standard model include HDMI?
No. HDMI connectivity requires the separately available HDMI 2.1 module.
What does the optional HDMI module add?
It adds two HDMI source inputs and one HDMI input and output connection with ARC, eARC and CEC.
Does the HDMI module support 8K?
Yes. It supports compatible video signals at up to 8K50 or 8K60.
Does the HDMI module support 4K120?
Yes. Compatible 4K100 and 4K120 video signals are supported.
Does the HDMI module support VRR and ALLM?
Yes. Variable Refresh Rate and Auto Low Latency Mode are supported with compatible equipment.
Does it decode Dolby Digital or DTS?
No. The TDAI-3400 is a two-channel amplifier. Connected video sources should be set to output compatible stereo PCM audio.
Can it connect to a subwoofer?
Yes. Its configurable analogue outputs and digital crossover allow suitable powered subwoofers to be integrated.
Can it be used with an external power amplifier?
Yes. Balanced XLR, unbalanced RCA and coaxial digital outputs provide several integration options.
Can it be used for bi-amplification?
Yes, within a correctly configured system using compatible loudspeakers, external amplification and appropriate crossover settings.
Is a remote control included?
Yes. An infrared and Bluetooth Low Energy remote control is supplied.
Can it be rack-mounted?
Yes. Optional rack-mounting hardware is available.
How large and heavy is it?
It measures approximately 450mm wide, 105mm high and 360mm deep, including its connections, and weighs around 8.2kg.
Which finish is available?
The TDAI-3400 is supplied in matte black.
Why Buy From Audio T?
- Specialist demonstrations with familiar music
- RoomPerfect demonstrations and calibration support
- Loudspeaker power and impedance matching
- Streaming service and network setup assistance
- High-resolution USB audio guidance
- Turntable and optional phono-module advice
- Optional HDMI 2.1 module guidance
- Subwoofer and boundary-woofer integration
- External power amplifier and bi-amplification advice
- Direct comparison with other Lyngdorf amplifiers
- Speaker cable and interconnect guidance
- Part-exchange options on suitable equipment
- Ongoing system, software and setup support
Contact your local Audio T store to arrange a demonstration or discuss building a high-performance music system around the Lyngdorf TDAI-3400.