Fosi Audio ZD3 Desktop DAC Preamp, Fully Balanced Digital to Analog Audio Converter with ES9039Q2M for Home Stereo Amplifier, Bluetooth/USB/Optical/Coax/TV HDMI ARC Input, XLR/RCA Output with Remote
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AI Verdict
A killer desktop DAC with balanced XLRs and a 12V trigger for your amp stack, but skip it for living room TVs due to buggy HDMI ARC and no subwoofer out.
The 12V trigger and balanced XLR outputs make this a perfect match for a desktop stack with Fosi's V3 Monos. The lack of a subwoofer output and reported HDMI ARC handshake issues with certain TVs severely limit its usefulness for living room home theater setups.
If you need a dedicated subwoofer out and flawless HDMI ARC for a TV setup, upgrade to a streaming preamp with built-in bass management.
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Pros
- Physical bypass switch on the bottom panel removes the volume control circuit for pure DAC output
- 12V trigger in/out syncs power states with external amplifiers like the Fosi V3 Monos
- Balanced XLR outputs deliver a wider soundstage and reject interference better than RCA
- ES9039Q2M chip measures at 126 dB SNR, ensuring a completely silent noise floor
- Socketed DIP8 op-amps allow you to swap the stock LME49720 chips for Sparkos or MUSES
Cons
- No dedicated subwoofer output forces you to rely on your amplifier for bass management
- HDMI ARC has a known 10-second wake delay and handshake issues with LG OLED TVs
- RCA preamp output voltage is lower than bypass mode, requiring you to turn your amp dial higher
- The 1.5-inch OLED screen's sample rate text is too small to read from a living room couch
Dimension Scores
The ES9039Q2M chip measures at 126 dB SNR and under 0.00008% THD+N, providing absolute transparency.
Preamp RCA output voltage is lower than expected, requiring you to push your amplifier's gain higher.
Includes HDMI ARC, balanced XLR, and 12V triggers, but completely omits a subwoofer output.
The aluminum chassis stays cool, but tapping it produces a slight ringing sound and the remote feels cheap.
Best For
- Desktop headphone or monitor setups utilizing balanced XLR cables
- Stacking with Fosi ZA3 or V3 Mono amplifiers using the 12V trigger cable
- PC gamers wanting a dedicated volume knob and zero USB audio delay
Not Recommended For
- Living room home theater setups relying on flawless HDMI eARC integration with LG TVs
- 2.1 channel audio systems that require a dedicated subwoofer output from the preamp
Watch Out For
- HDMI ARC handshake issues with LG TVs — it often wakes up 10 seconds late or forces you to use the DAC remote instead of the TV remote.
- The RCA preamp output voltage is surprisingly low compared to bypass mode, meaning you'll have to crank your amplifier's volume dial higher than expected.
- The 1.5-inch OLED screen is crisp for desktop use, but the sample rate and input text is too small to read from a living room couch.
- No dedicated subwoofer output means you'll need an amplifier with its own sub out or use high-level speaker connections if you want a 2.1 setup.
Full Specifications
| ASIN | B0DHXH9RLZ |
| Brand | Fosi Audio |
| Item Weight | 2.65 pounds |
| Manufacturer | Vision Technology (Guangzhou) Co., Ltd. |
| Interface Type | Coaxial, HDMI, Optical, RCA, USB |
| Number of Pins | 15 |
| Item model number | ZD3 |
| Number of Channels | 2 |
| Product Dimensions | 6.1 x 7.24 x 2.01 inches |
What Buyers Say
The ZD3 shines as a transparent, balanced DAC for desktop setups, especially when paired with Fosi's own amplifiers via the 12V trigger. Audio Science Review measurements confirm it delivers flawless, noise-free signal conversion through the ES9039Q2M chip. The inclusion of HDMI ARC is a massive bonus at this price, though real-world testing reveals frustrating handshake delays with LG TVs. The biggest physical limitation is the 1.5-inch OLED screen, which is practically unreadable from across a living room.
“Love the sound and the XLR outs for my desk, but the HDMI ARC is super buggy with my LG TV and I have to use the Fosi remote anyway.”
Common Praise
- Dead-silent noise floor with 126 dB SNR over balanced XLR outputs
- Physical bypass switch on the bottom completely removes the preamp circuit
- 12V trigger perfectly syncs power with Fosi V3 Mono amplifiers
- Aluminum chassis stays completely cool even after hours of use
Common Complaints
- HDMI ARC fails to wake up reliably with LG C-series OLED TVs
- RCA preamp output voltage is significantly quieter than the bypass signal
- Sample rate text on the 1.5-inch OLED is impossible to read from a couch
- Lack of a dedicated subwoofer output complicates 2.1 channel setups
Ownership Tips
- The volume knob has a satisfying, smooth rotation but the included remote is made of cheap plastic.
- Tapping the chassis produces a slight ringing sound, though it doesn't affect audio playback.
- You have to manually switch inputs before turning off your TV to avoid HDMI ARC wake issues.
Frequently Asked Questions
Does the HDMI ARC let me control volume with my TV remote?
Yes, but users report handshake and wake-up delays specifically with LG OLED TVs. You might still need the Fosi remote to fix input switching issues.
Can I bypass the volume control to use it just as a DAC?
Yes. There is a physical bypass switch on the bottom of the unit that removes the preamp circuit entirely.
Does it have a subwoofer output?
No. It only has stereo XLR and RCA outputs, so you'll need an amp with a sub out for a 2.1 system.
What op-amps does it come with?
It ships with LME49720 op-amps. They are socketed DIP8, allowing you to swap them for Sparkos or MUSES chips.
Is the Bluetooth connection high-res?
It supports aptX HD, but Bluetooth is inherently lossy and limited to 24-bit/48kHz on this device.
Buying Guide
When buying a budget DAC/preamp, you are paying for clean signal conversion and connectivity convenience. The ZD3 gives you high-end balanced XLR outputs and a 12V trigger, which are rare under $200 and perfect for desktop amplifier stacks. Skip this if you expect a flawless home theater hub. The HDMI ARC is a nice bonus but proves buggy with LG OLEDs.
ES9039Q2M Chip
The brain that turns digital 1s and 0s into analog sound. This specific chip is known for extreme clarity and zero audible background hiss.
Balanced XLR Outputs
Three-pin audio connections that reject electrical interference better than standard RCA cables, crucial if you have a lot of electronics on your desk.
12V Trigger
A simple cable connection that tells your amplifier to turn on or off automatically when the DAC does.
Alternatives
If you need a dedicated subwoofer output, built-in room EQ, or more reliable HDMI ARC for a living room TV, look for a dedicated streaming preamp in the $300 range.
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