FiiO K9 Pro ESS vs RME ADI-2 DAC FS
96 facts in comparison
Based on 56 Reddit opinions. DAC FSRME ADI-2 DAC FS leads by 13 points.
56 opinions
DAC FS leads by 13pts
VS
70%
B-
Based on
58 Redditors
FiiO K9 Pro ESS
~$649.99
25 opinions
tldr; K9 with ESS chip. Same power, different flavor. For ESS fans.
Check pricesVS
Reddit's Pick
83%
B+
Based on
57 Redditors
Winner
RME ADI-2 DAC FS
31 opinions
tldr; Pro audio meets consumer. Insane features, PEQ, reference. The Swiss Army knife.
Check prices🎵SOU
⭐FEA
⚡AMP
🔧BUI
64
Points
67
Points
Score by Category
Sound Quality
80%50%
Features & Connectivity
100%50%
Amp Performance
50%—
Build Quality
—100%
Why is ADI-2 DAC FS better than K9 Pro ESS?
- Higher Reddit score (83% vs 70%)
- Parametric EQ built-in
- Reference quality
- Pro features
Based on 115 Reddit opinions
Clear Winner
Reddit prefers the DAC FSRME ADI-2 DAC FS
Winning by 13 points (83% vs 70%)
Parametric EQ built-in
Reference quality
Pro features
High confidence (115 mentions)
💬Reddit Sentiment
Based on 115 Reddit mentionsOverall Rating
Pro ESS
7.0/10
58 mentions
DAC FS
8.3/10
57 mentions
AMP SECTION
Pro ESS5.0/10
DAC FSN/A
SOUND QUALITY
Pro ESS8.0/10
DAC FS5.0/10
VALUE
Pro ESS2.5/10
DAC FSN/A
FEATURES
Pro ESS10.0/10
DAC FS5.0/10
BUILD QUALITY
Pro ESSN/A
DAC FS10.0/10
⚔️
Head to Head
| Topic | Pro ESS | DAC FS |
|---|---|---|
Amp Section | 50% | N/A |
Sound Quality | 80% | 50% |
Value | 25% | N/A |
Features | 100% | 50% |
Build Quality | N/A | 100% |
Category Wins
Pro ESS: 4|DAC FS: 1
Head to Head
Pro ESS: 4|DAC FS: 1
Amp SectionPro ESS
Pro ESS50%
DAC FSN/A
Sound QualityPro ESS
Pro ESS80%
DAC FS50%
ValuePro ESS
Pro ESS25%
DAC FSN/A
FeaturesPro ESS
Pro ESS100%
DAC FS50%
Build QualityDAC FS
Pro ESSN/A
DAC FS100%
Pro ESS
70%
83%
DAC FS
Pro ESS70%
DAC FS83%
DAC FS wins by 13 points
Key Specs
| Spec | FiiO K9 Pro ESS | RME ADI-2 DAC FS |
|---|---|---|
| DAC Chip | Dual ESS ES9038PRO | — |
| Amp Chip | Dual THX AAA 788+ | — |
| Output Power Balanced | 2.1W at 32 ohms, 1.1W at 300 ohms | — |
| Sampling Rate Usb | Up to 384kHz/32bit, DSD256 | — |
| Headphone Outputs | 6.35mm single-ended, 4.4mm balanced, 4-pin XLR balanced | — |
Key Highlights
FiiO K9 Pro ESS
⚡ Same K9 power
🔊 ESS Sabre chip
🔧 Full featured
💰 Premium
RME ADI-2 DAC FSWinner
🔧 Parametric EQ built-in
📏 Reference quality
🎛️ Pro features
💰 Premium
Topic Battles
Pro ESS: 3|Tied: 0|DAC FS: 1
🎵Sound Quality
Pro ESS winsPro ESS
80%
DAC FS
50%
⭐Features & Connectivity
Pro ESS winsPro ESS
100%
DAC FS
50%
⚡Amp Performance
Pro ESS winsPro ESS
50%
DAC FS
—
🔧Build Quality
DAC FS winsPro ESS
—
DAC FS
100%
Based on Reddit sentiment across 4 categories
📈Where They Rank
💬What Redditors Actually Say
What Redditors Say
Best praise vs top criticism for RME ADI-2 DAC FS
Best Praise
+15 pts“I sold everything else after getting it in a deal for my hd800s, rme adi 2 dac fs is the goat, i love its software, eq and effects”
r/headphones
ViewTop Criticism
+143 pts“here's the timeline: \- bought ADI-2 DAC FS last wednesday. worked great until... \- during normal operation on saturday night, it cut off while i was listening to music. no warnings or strange behavior beforehand \- contacted my local dealer. he had no more of this model on hand, so i have to RMA \- my dealer contacts RME USA to start the RMA process and this is the response. Dude denied the claim off rip. at no point did i use any other PSU other than the one that came in the box (because i don't have one, and also why would i?). same with the USB cable. and at no point was it plugged into the wall directly, because i have a massive UPS and i care about my equipment. obviously, i'm pissed at this response. it feels... unscrupulous. shouldn't they at least see what's wrong with it before telling me to fuck off?”
r/headphones
View3 more quotes available below
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
View3 more quotes available below
Sentiment Over Time
FiiO K9 Pro ESS
RME ADI-2 DAC FS
📈Historical Price Data
FiiO K9 Pro ESS
RME ADI-2 DAC FS
FiiO K9 Pro ESS
All-time low: $499.99(2025-07)
RME ADI-2 DAC FS
All-time low: $1329(2020-10)
Which is Better?
RME ADI-2 DAC FS Wins
83%
FS
vs
70%
ESS
RME ADI-2 DAC FS leads by 13 points based on 115 Reddit opinions.
Why DAC FSWinner
- 🔧 Parametric EQ built-in
- 📏 Reference quality
- 🎛️ Pro features
Why Pro ESS
- Better Features (100% vs 50%)
❤️The Love/Hate Breakdown
Sentiment Breakdown
49%Positive
Positive
49%Neutral
46%Negative
5%Based on 57 Reddit opinions
Sentiment Breakdown
28%Positive
Positive
28%Neutral
56%Negative
16%Based on 58 Reddit opinions
Frequently Asked Questions
Which is better, RME ADI-2 DAC FS or FiiO K9 Pro ESS?
Based on 115 Reddit comments, RME ADI-2 DAC FS is the preferred choice with 83% positive sentiment vs FiiO K9 Pro ESS's 70%. RME ADI-2 DAC FS leads by 13 percentage points.
Should I buy RME ADI-2 DAC FS or FiiO K9 Pro ESS?
If you want the safer choice based on community sentiment, RME ADI-2 DAC FS has stronger approval ratings (83% vs 70%). However, FiiO K9 Pro ESS may still be better depending on your specific needs, budget, or use case.
What do Redditors love about RME ADI-2 DAC FS?
Reddit users highlight: Parametric EQ built-in. Reference quality. Pro features. With 57 mentions and 83% approval, it's a well-regarded choice in the community.
What do Redditors say about FiiO K9 Pro ESS?
Reddit users highlight: Same K9 power. ESS Sabre chip. Full featured. With 58 mentions and 70% approval, it remains a popular alternative.
How many Reddit reviews were analyzed?
This comparison analyzed 115 Reddit comments: 57 about RME ADI-2 DAC FS and 58 about FiiO K9 Pro ESS. Data was sourced from DACs community discussions.
How accurate are these ratings?
Our sentiment analysis is approximately 80-85% accurate compared to manual review. Well-discussed products with many mentions tend to have more reliable scores than niche items with fewer data points.
Why trust Reddit over professional reviews?
Reddit users bought products with their own money and have no incentive to mislead. You're seeing hundreds of real opinions across different use cases, not just one reviewer's take. This crowdsourced approach surfaces both common praise and recurring complaints.
56 Reddit opinions analyzed · Last updated 9/15/2026