The Lyngdorf TDAI-3400 carries forward the brand’s fully digital amplification approach, but packs in enough additional functionality that, as Peter Lyngdorf puts it, he struggles to remember everything it can do.
Fully digital power, and why it stays quiet
Volume control on the TDAI-3400 works by adjusting the voltage of the power supply itself, so the amplifier delivers the same sound quality whether it’s running at 0.5 watts or 400 watts — a consistency Lyngdorf says is effectively impossible to achieve any other way. It’s the same fully digital amplification technology first used in the TacT Millennium amplifier, now paired with a far more sophisticated switch-mode power supply that reaches a 137 dB noise ratio. Without a feedback loop to strip noise out after the fact, that quiet baseline has to come from the power section itself.
RoomPerfect and seamless subwoofer integration
Beyond amplification, the TDAI-3400 includes a dedicated low-frequency output for a subwoofer or woofer system, with RoomPerfect handling proper time alignment between the woofer and the mid/high speakers so the two work together as a single, unified speaker — something Lyngdorf says the system gets right every single time, without the trial-and-error or overly conservative crossover points that competing systems typically need. The smaller TDAI-2170 — the amplifier behind the on-wall Lyngdorf FR-1 — shares this same capability.
A long feature list, built for the long term
On top of the core amplification and room correction, the TDAI-3400 adds HDMI input, high-quality USB, 384kHz DSD support, and — new to this generation — a pre-voicing option that lets a listener adjust their own perception of a speaker’s character (a touch more midrange or bass, for instance) before RoomPerfect is applied. A web interface handles setup, including custom voicing profiles for movies or louder listening. A headphone output comes with its own sophisticated EQ system for tuning personal taste. HDCP lets the TV remote control volume once the TDAI-3400 is hooked up to a television, and the amplifier also supports Bluetooth and Roon streaming. Lyngdorf expects the unit’s DSP headroom to support further software updates down the line, delivered automatically once connected to the internet.
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Frequently asked questions
How does the TDAI-3400 keep the same sound quality at any volume?
Volume is controlled by adjusting the power supply’s voltage rather than through a traditional volume stage, so playback stays consistent from 0.5 to 400 watts.
Can the TDAI-3400 integrate a subwoofer with the main speakers?
Yes — RoomPerfect handles time alignment between the woofer and mid/high speakers, making them behave as one unified speaker system.
What is pre-voicing on the TDAI-3400?
A feature that lets you adjust a speaker’s perceived character — for example a bit more bass or midrange — before RoomPerfect’s room correction is applied.
Does the TDAI-3400 support streaming?
Yes, including Bluetooth and Roon, alongside HDMI, high-quality USB and 384kHz DSD input.
