USB DAC headphone amplifier
4.4BAL+3.5SE output | Excellent output drive ability
3 Gain Level | easily switch by button
Model | ![]() Sonata BHD PRO | ![]() Sonata BHD PRO Ultra |
Core Hardware | FPGA + Dual Crystal Oscillators + Dual CS43131 | FPGA + Dual Crystal Oscillators + Quad CS43198 |
Screen Interaction | Color Screen | Color Screen |
A metronome‑precision tuning philosophy. | (A hard‑core microscope for micro‑rhythms). The FDAS system precisely captures every rapid key strike, glissando, and micro‑pause. Tailored for ears with instrumental experience and a sensitivity to timing. | (Soundstage reconstruction for symphonic music). The FDAS system precisely captures every rapid key strike, glissando, and micro‑pause. The four‑chip, single‑channel, fully‑driven architecture acts like a “coordinate mapping” system — placing every musician of a full symphony orchestra precisely within the soundstage, ensuring that multiple instruments remain perfectly ordered and distinct. |
Scenarios your body will thank you for. | Solo listening sessions — small‑ensemble folk music, classical chamber works. | Deep audiophile listening — large‑scale symphonic music, acoustic live performances for the soul. |
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It thoroughly eliminates jitter:
a FIFO asynchronous buffer forcibly isolates stray electrical noise from the phone or computer upstream.
On‑board precision dual crystal oscillators: like a strict mechanical metronome that "locks the beat" with absolute precision,
pinning every single note exactly where it belongs on the timeline.

Some products on the market use a single DAC chip to force an "inverted" negative signal through an analog circuit. This is like using a rough mirror to reflect light — it may look like a balanced connection, but the signal is already fighting itself internally. That's why some devices boast massive output power, yet the sound comes out as a muddy, congested mess — no soundstage, no clarity, just fatigue.

Powered by a quad‑flagship CS43198 DAC array.
Each signal branch — L+ / L− / R+ / R− — is driven by its own fully‑specified DAC.
This four‑chip, single‑channel, fully‑driven architecture pushes dynamic range and channel separation to the very physical limits of the hardware.

When you're listening to a large‑scale symphony or an intricate folk ensemble, the true‑balanced, multi‑chip architecture delivers two immediate benefits:
1.The violin stays front‑left, the guzheng remains back‑right — with a palpable sense of air between them, never blurred together.
2. Instrument placement is no longer a vague, left‑right guessing game. Instead, it's precisely locked in place, as if metronomically anchored to its own coordinate.
We take care of the engineering. Your body takes care of the rest.
When every instrument has its own space, your brain no longer struggles to decode a chaotic soundstage — and the tension naturally melts away.

TempoTec leverages a true‑balanced, multi‑chip differential architecture to achieve remarkable energy conversion efficiency. We don't waste a single milliwatt of your phone's battery — yet on the 4.4mm balanced output, we unleash breathtaking, room‑filling power that effortlessly drives even high‑impedance over‑ear headphones to their full potential.

What does underpowered sound like?
Thin, lifeless vocals — a soundstage cramped and claustrophobic — bass that hits like a plastic bucket instead of a drum.
This unnatural, strained presentation forces your brain to subconsciously tense up and work harder just to follow along. The result? The more you listen, the more exhausted you feel.
the entire sonic architecture of the music opens up — the spatial distance between instruments becomes palpable.
In a symphony orchestra, the cello's low-end extension turns warm and substantial, while the violins soar high with a smooth, silky timbre — detailed, yet never harsh.

With such abundant power at its core, paired with FPGA precision and dual‑crystal oscillator timing,
the music is no longer a chaotic barrage of sound — it's a perfectly ordered, immersive experience.

The moment you put on your headphones — even those that were once notoriously difficult to drive — they finally unleash a live, unadulterated sense of presence. Your shoulders, tense from a long day, naturally drop. Your body begins to sway gently with the music. All that driving power — just for this one moment of release.

We dive deep into engineering — not to send you to music theory class.
The independent color screen lets you tweak the digital filters at will.
And when, after a long day, your shoulders drop and those goosebumps you haven't felt in years finally return… that’s more than enough.

Model | ![]() Sonata BHD PRO | ![]() Sonata BHD PRO Ultra |
Core Hardware | FPGA + Dual Crystal Oscillators + Dual CS43131 | FPGA + Dual Crystal Oscillators + Quad CS43198 |
Screen Interaction | Color Screen | Color Screen |
A metronome‑precision tuning philosophy. | (A hard‑core microscope for micro‑rhythms). The FDAS system precisely captures every rapid key strike, glissando, and micro‑pause. Tailored for ears with instrumental experience and a sensitivity to timing. | (Soundstage reconstruction for symphonic music). The FDAS system precisely captures every rapid key strike, glissando, and micro‑pause. The four‑chip, single‑channel, fully‑driven architecture acts like a “coordinate mapping” system — placing every musician of a full symphony orchestra precisely within the soundstage, ensuring that multiple instruments remain perfectly ordered and distinct. |
Scenarios your body will thank you for. | Solo listening sessions — small‑ensemble folk music, classical chamber works. | Deep audiophile listening — large‑scale symphonic music, acoustic live performances for the soul. |
Due to batch. process adjusimnent and other reasons, the details of the accessories may differ from the display. The actual accessory is the final standard.
