FiiO K9 Pro ESS
$$ Mid-range$649.99
tldr; K9 with ESS chip. Same power, different flavor. For ESS fans.
$649.99 on AmazonSentiment Breakdown
28%Positive
Positive
28%Neutral
56%Negative
16%Based on 58 Reddit opinions
Strengths & Weaknesses
Each axis shows what % of Reddit comments are positive about that topic. Higher = more praise.
Key Features
- [Supports up to 384 kHz and native DSD256]: The K9Pro ESS desktop DAC is equipped with the high performance dual ES9038PRO, supporting up to 384 kHz and native DSD256 audio.
- [Support lossless MQA renderer]: The K9Pro ESS amplifier supports the unfolding of MQA tracks, allowing you to listen to high-resolution audio files that are not only reasonably sized, but also retain master-level sound quality that brings you directly into the recording studio.
- [Bluetooth 5.1 and High Resolution Bluetooth]: The K9Pro ESS bluetooth headphone amps supports AAC/SBC/aptX/aptX LL/aptX HD/LDAC/aptX adaptive lossless bluetooth formats, it means you could get high resolution sound more convenient.
- [Plentiful playing ways]: ①Front: XLR 4-pin, 4.4mm balanced, 6.35mm single-ended headphone outputs ;②Rear: 4.4mm balanced Line in; coaxial, optical, RCA, XLR out; for more convenient connections to external amps or speakers; ③Side: USB Type-C port, for your player, mobile phone,PC.
- [DAC/AMP combos]: K9Pro ESS desktop amplifier can drive 600Ω power-hungry headphones. Connect to your pc, players as desktop dac, you also could play with your speaker or external amplifier.
- ⚡ Same K9 power
- 🔊 ESS Sabre chip
- 🔧 Full featured
Sentiment Over Time
Historical Price Data
FiiO K9 Pro ESS
FiiO K9 Pro ESS
All-time low: $499.99(2025-07)
What Redditors Actually Say
What Redditors Say
Best praise vs top criticism for FiiO K9 Pro ESS
Best Praise
+12 pts“Sound/Build/Power quality is actually pretty good with the Magni Unity & DAC version which was a panic buy when the K9 suddenly died on me. Sent the K9 ESS Pro off to Fiio in China for repairs waiting to hear back on that which is really upsetting as it was my favourite dac / amp combo I’ve owned and I’ve had a few (got 2 years out of it before it hardware failed)”
r/headphones
ViewTop Criticism
+4 pts“I was one of the first owners when they released guess everyone can use me as the genuine pig, I got 2 years out of mine but a lot of reports of the same issues and them dying earlier while Fiio have stayed quiet on the matter should make people really think before buying.”
r/headphones
View13 more quotes available below
Related Products
Frequently Asked Questions
Is the FiiO K9 Pro ESS worth buying?
K9 with ESS chip. Same power, different flavor. For ESS fans.
What do Redditors love about the FiiO K9 Pro ESS?
Redditors highlight: ⚡ Same K9 power. 🔊 ESS Sabre chip. 🔧 Full featured.
What are the downsides of the FiiO K9 Pro ESS?
Some criticisms include: "I was one of the first owners when they released guess everyone can use me as the genuine pig, I got 2 years out of mine but a lot of reports of the same issues and them dying earlier while Fiio have..."
How accurate are these ratings?
Our sentiment analysis is approximately 80-85% accurate compared to manual review. Products with more mentions (FiiO K9 Pro ESS has 58) tend to have more reliable scores.
58 Reddit opinions analyzed • Last updated 5/20/2026