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Lyngdorf TDAI-3400: Impressive amplifier from Denmark

Lyngdorf TDAI-3400
Lyngdorf TDAI-3400

Lyngdorf TDAI-3400 became a logical continuation of the previous model Lyngdorf TDAI-2170 . They are very similar in appearance; the modern device only has one more “window” on the front panel. But this is not an auxiliary display, as I first thought, but really a window to the outside world: the antennas of the built-in Bluetooth and Wi-Fi modules are installed behind the plastic cover.

The Danes did not move the “horns” outside so as not to disturb the purity of the lines, and inside a completely closed case the antennas would be of no use. I am very impressed by the Scandinavian style of Lyngdorf Audio – its emphasized rigor testifies to the highest professionalism and non-trivial thinking of the designers.


It is noteworthy that the Lyngdorf TDAI-3400, with the same dimensions as its predecessor (the body height is increased by only 5 mm), has a much more advanced hardware. The output power of 4-ohm amplifiers has been increased from 2 x 170 to 2 x 400 W, and the load current has been increased to 40 A, while nonlinear distortion is reduced by several hundredths. Moreover, without forced cooling – there are no fans in the device.

And all thanks to the fact that high-frequency MOSFETs of a new generation with low channel resistance are used as output switches. The Lyngdorf TDAI-3400 adds a built-in media player with support for Roon Ready, Spotify Connect, DLNA and AirPlay, which can also play audio files via USB and receive Internet radio via vTuner.


The number of settings and adjustments is amazing: their description takes up more than 20 pages in the user manual, and the main menu has 18 sections with several lines in each. The service is truly fantastic – the device can be optimized for several configurations (stereo, home theater), any acoustics and any room.

The latter task is solved using the proprietary RoomPerfect auto-calibration system, which analyzes the acoustics of the room through an external microphone, after which it not only corrects the frequency and phase characteristics of the amplifier, but also minimizes the effect of standing waves. The algorithm provides two modes of operation. When set to GLOBAL, the sound is optimized across the entire area of ​​the room (this requires taking several measurements in it), and by selecting FOCUS, the most balanced sound can be obtained at the selected listening point.


Among the settings, we can note 32 frequency response presets in the middle range (Voicing), low-pass and high-pass filters, tone and balance controls, the formation of delays for matching with the subwoofer, limiting the maximum volume, setting sensitivity and other parameters for all, incl. and digital inputs, as well as separate settings for HDMI.

For your own speaker systems, there are ready-made combinations of parameters in the DSP memory – you just need to select the desired model in the menu. And, of course, the amplifier uses proprietary technologies to eliminate the effects inherent in digital playback. This is the ICC (Intersample Clipping Correction) algorithm, which eliminates clipping and restores the original dynamic range of the signal, as well as a circuit design called Blackground, which ensures absolute “digital” silence in pauses.


The standard switching of the device can be expanded using optional modules. One of them contains three HDMI 2.0a inputs with support for ARC, CEC and HDCP 2.2 and one output, and the second contains a set of RCA and XLR line inputs with high-quality buffering. The firmware is updated over the network, and all software, filter parameters and other corrections are loaded from an SD card, which can be easily removed and rewritten if necessary. Control – from the remote control (works via IR and Bluetooth LFE) or the front panel, as well as through the web interface, IP Control/RS-232 protocols and the Lyngdorf Remote application for mobile devices.

Characteristics Lyngdorf TDAI-3400

Functions: integrated amplifier with audio processor
Configuration: stereo
Frequency range: 20 – 20000 Hz ±0.5dB ||
Amplifier output power (4/8 ohms): 2 x 400/2 x 200 W RMS
Distortion: <0.05% (20 Hz – 20 kHz, 1 W/8 ohms)
Amplifier type: Class D
Digital inputs: AES- EBU (192/24, asynchronous, 2 x Coax (192/24), 3 x optical (96/24), USB B (384/32, DSD128, DXD)
Analog inputs: 2 x RCA (max. 4 V level at 0 dBFS), microphone for RoomPerfect
HDMI module: HDMI output, 3 x HDMI inputs (PCM 192/24), optional – ARC input/output (PCM 192/24) with support for CEC and HDCP 2.2
Analog input module: 3 x RCA, 1 x XLR
Standard outputs: analog stereo RCA and XLR 1, coaxial and 3.5 mm headphones
Media player: Roon Ready, Spotify Connect, DLNA, AirPlay, USB LAN, Internet Radio (vTuner)
Wireless connections: Bluetooth (4.2 LFE ), Wi-Fi (802.11 n/ac)
Dimensions: (W x H x D): 450 x 105 x 360 mm
Weight: 8.2 kg

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