The FiiO K9 Pro ESS is a highly versatile DAC and amplifier with Bluetooth, various connections, and high-quality components. It features the appropriate outputs to connect headphones and speakers, as well as numerous analog and digital inputs to link your music sources. Additionally, music can also be played wirelessly via Bluetooth from your smartphone, tablet, or laptop through the K9 Pro ESS. The many connection options make the FiiO K9 Pro ESS the ideal interface for all your audio equipment. The laptop connects to the USB input of the FiiO K9 Pro ESS. Music players, smartphones, tablets, etc., can be connected via the RCA input, as well as coaxial or optical connections. For speaker connections, RCA and XLR outputs are available. Headphones can be connected symmetrically via XLR or 4.4 mm, or unsymmetrically via 6.35 mm jack on the front of the K9 Pro ESS. An adapter from 6.35 mm to 3.5 mm is included in the package. On the front of the FiiO K9 Pro ESS, there is a knob for three gain settings. A button allows you to switch between input sources (USB, optical, coaxial, line, Bluetooth). The large volume knob on the front of the K9 Pro ESS allows for precise volume adjustment. The solid aluminum housing of the FiiO K9 Pro ESS is finished in a subtle black, making it suitable for both a desk and a HiFi rack. The two ESS Sabre ES9038Pro digital-to-analog converters ensure very natural and dynamic sound quality. The two built-in THX AAA788+ headphone amplifiers are true powerhouses, capable of driving even demanding headphones with virtually no sound distortion of any kind. Thanks to these high-quality components, every single sound detail is realistically reproduced, allowing you to enjoy finely resolved and detailed sound with the FiiO K9 Pro ESS.
The FiiO K9 Pro ESS is a highly versatile DAC and amplifier with Bluetooth, various connections, and high-quality components. It features the appropriate outputs to connect headphones and speakers, as well as numerous analog and digital inputs to link your music sources. Additionally, music can also be played wirelessly via Bluetooth from your smartphone, tablet, or laptop through the K9 Pro ESS. The many connection options make the FiiO K9 Pro ESS the ideal interface for all your audio equipment. The laptop connects to the USB input of the FiiO K9 Pro ESS. Music players, smartphones, tablets, etc., can be connected via the RCA input, as well as coaxial or optical connections. For speaker connections, RCA and XLR outputs are available. Headphones can be connected symmetrically via XLR or 4.4 mm, or unsymmetrically via 6.35 mm jack on the front of the K9 Pro ESS. An adapter from 6.35 mm to 3.5 mm is included in the package. On the front of the FiiO K9 Pro ESS, there is a knob for three gain settings. A button allows you to switch between input sources (USB, optical, coaxial, line, Bluetooth). The large volume knob on the front of the K9 Pro ESS allows for precise volume adjustment. The solid aluminum housing of the FiiO K9 Pro ESS is finished in a subtle black, making it suitable for both a desk and a HiFi rack. The two ESS Sabre ES9038Pro digital-to-analog converters ensure very natural and dynamic sound quality. The two built-in THX AAA788+ headphone amplifiers are true powerhouses, capable of driving even demanding headphones with virtually no sound distortion of any kind. Thanks to these high-quality components, every single sound detail is realistically reproduced, allowing you to enjoy finely resolved and detailed sound with the FiiO K9 Pro ESS.
The FiiO K9 Pro ESS is a highly versatile DAC and amplifier with Bluetooth, various connections, and high-quality components. It features the appropriate outputs to connect headphones and speakers, as well as numerous analog and digital inputs to link your music sources. Additionally, music can also be played wirelessly via Bluetooth from your smartphone, tablet, or laptop through the K9 Pro ESS. The many connection options make the FiiO K9 Pro ESS the ideal interface for all your audio equipment. The laptop connects to the USB input of the FiiO K9 Pro ESS. Music players, smartphones, tablets, etc., can be connected via the RCA input, as well as coaxial or optical connections. For speaker connections, RCA and XLR outputs are available. Headphones can be connected symmetrically via XLR or 4.4 mm, or unsymmetrically via 6.35 mm jack on the front of the K9 Pro ESS. An adapter from 6.35 mm to 3.5 mm is included in the package. On the front of the FiiO K9 Pro ESS, there is a knob for three gain settings. A button allows you to switch between input sources (USB, optical, coaxial, line, Bluetooth). The large volume knob on the front of the K9 Pro ESS allows for precise volume adjustment. The solid aluminum housing of the FiiO K9 Pro ESS is finished in a subtle black, making it suitable for both a desk and a HiFi rack. The two ESS Sabre ES9038Pro digital-to-analog converters ensure very natural and dynamic sound quality. The two built-in THX AAA788+ headphone amplifiers are true powerhouses, capable of driving even demanding headphones with virtually no sound distortion of any kind. Thanks to these high-quality components, every single sound detail is realistically reproduced, allowing you to enjoy finely resolved and detailed sound with the FiiO K9 Pro ESS.
The FiiO K9 Pro ESS is a highly versatile DAC and amplifier with Bluetooth, various connections, and high-quality components. It features the appropriate outputs to connect headphones and speakers, as well as numerous analog and digital inputs to link your music sources. Additionally, music can also be played wirelessly via Bluetooth from your smartphone, tablet, or laptop through the K9 Pro ESS. The many connection options make the FiiO K9 Pro ESS the ideal interface for all your audio equipment. The laptop connects to the USB input of the FiiO K9 Pro ESS. Music players, smartphones, tablets, etc., can be connected via the RCA input, as well as coaxial or optical connections. For speaker connections, RCA and XLR outputs are available. Headphones can be connected symmetrically via XLR or 4.4 mm, or unsymmetrically via 6.35 mm jack on the front of the K9 Pro ESS. An adapter from 6.35 mm to 3.5 mm is included in the package. On the front of the FiiO K9 Pro ESS, there is a knob for three gain settings. A button allows you to switch between input sources (USB, optical, coaxial, line, Bluetooth). The large volume knob on the front of the K9 Pro ESS allows for precise volume adjustment. The solid aluminum housing of the FiiO K9 Pro ESS is finished in a subtle black, making it suitable for both a desk and a HiFi rack. The two ESS Sabre ES9038Pro digital-to-analog converters ensure very natural and dynamic sound quality. The two built-in THX AAA788+ headphone amplifiers are true powerhouses, capable of driving even demanding headphones with virtually no sound distortion of any kind. Thanks to these high-quality components, every single sound detail is realistically reproduced, allowing you to enjoy finely resolved and detailed sound with the FiiO K9 Pro ESS.
Last updated at 06/09/2026 20:47:36
Fiio K9 Pro Ess Desktop Bluetooth Dac And Amp
Delivery $158.32
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
FiiO K9 Pro ESS Desktop DAC Headphone Amplifier Bluetooth USB DAC DSD Decoder Support MQA Music
Free delivery
FiiO K9 Pro ESS - High-Fidelity Headphone Amplifier, 6.35 mm jack, Jack 4.4 mm, XLR 4-pin
Delivery $160.09
originally posted on apos.audio
This is my first time buying from Apos and apart from the live support not active at all and slow support responses the purchase was quite satisfactory and the product was delivered with care and packaged nicely as well as quick shipping, I recieved my package 3 days from ordering. The product itself is amazing the K9 Pro has such a lush and vibrant sound (coming from an L50 E50 stack, this is a clear upgrade and pairs really well with my headphones, (Focal Clear, Arya Stealth, Sundara, 560s and IE 600's the unit itself is built really well, heavy and dense feeling, great input choices and outputs, I'd highly recommend this DAC AMP for an all in one solution!
originally posted on apos.audio
Just received my Fiio K9 Pro. Shipping was fast, and arrived in perfect condition. Box in a box. I have the K9 hooked up to my Apple Mac M1 Mini, and going to a pair of KRK Rokit 8 G4's right now. The sound is so clean and pure. Its hard to describe, but my ears are having orgasms after orgasms right now. Can't wait for this thing to break-in a bit. Over all I'm very impressed with the level of quality of this product. Fiio did an amazing job on this. You definitely can't go wrong adding this to your system. And the whole ordering experience with APOS was flawless.
originally posted on apos.audio
I was looking for an all in one for my IEM's on my exercise bike. I was not expecting the quality of the K9. The dual pro ess dacs, balanced design and thx amps combine to make a top class piece of equipment. The design with the large volume knob also scores high. The thing is built like a tank. The sound rivals my Pontus
| Form Factor | Tabletop |
| Number of Headphone Channels | 3-Channel |
| Recommended Headphone Impedance | 16 to 600 Ohms |
| Other I/O | 1 x Coaxial SMA Antenna |
| Wireless Connectivity | Bluetooth (Audio Streaming, Mobile App) |
Fiio K9 Pro Ess Desktop Bluetooth Dac And Amp
Delivery $158.32
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
FiiO K9 Pro ESS Desktop DAC Headphone Amplifier Bluetooth USB DAC DSD Decoder Support MQA Music
Free delivery
FiiO K9 Pro ESS - High-Fidelity Headphone Amplifier, 6.35 mm jack, Jack 4.4 mm, XLR 4-pin
Delivery $160.09
This is my first time buying from Apos and apart from the live support not active at all and slow support responses the purchase was quite satisfactory and the product was delivered with care and packaged nicely as well as quick shipping, I recieved my package 3 days from ordering. The product itself is amazing the K9 Pro has such a lush and vibrant sound (coming from an L50 E50 stack, this is a clear upgrade and pairs really well with my headphones, (Focal Clear, Arya Stealth, Sundara, 560s and IE 600's the unit itself is built really well, heavy and dense feeling, great input choices and outputs, I'd highly recommend this DAC AMP for an all in one solution!
Just received my Fiio K9 Pro. Shipping was fast, and arrived in perfect condition. Box in a box. I have the K9 hooked up to my Apple Mac M1 Mini, and going to a pair of KRK Rokit 8 G4's right now. The sound is so clean and pure. Its hard to describe, but my ears are having orgasms after orgasms right now. Can't wait for this thing to break-in a bit. Over all I'm very impressed with the level of quality of this product. Fiio did an amazing job on this. You definitely can't go wrong adding this to your system. And the whole ordering experience with APOS was flawless.
I was looking for an all in one for my IEM's on my exercise bike. I was not expecting the quality of the K9. The dual pro ess dacs, balanced design and thx amps combine to make a top class piece of equipment. The design with the large volume knob also scores high. The thing is built like a tank. The sound rivals my Pontus
I bought (and returned) two other DAC/AMP combos before trying and settling with this one. The FiiO K9Pro is built solid, sounds amazing, and has everything I need to connect audio from my TV and PC. I’ve even used the Bluetooth feature and didn’t expect myself to. The volume knob is silky smooth and the controls are easy once you get the muscle memory down (button and switch labels on the device are difficult to read). App control is nice but would be better with volume control.
Sound, it has a very slight warmish tint, yet also the upper frequencies seem to be just slightly elevated as well giving it a smooth yet detailed experience. Build quality is exceptional, features that it has is awesome. It pushes my Edifier S880DB speakers with ease, and it's super simple to switch from speakers to headphones with a simple switch. I do have two problems with it, one is the inscriptions next to the buttons, I can barely read them which is a pain, the other is the power. It will power mostly everything I have, but if you have a higher Ohm headphone you might want to connect an amp to it for those occasions, I ended up attaching an iFi Zen Can to solved this problem without sacrificing the sound somewhat. Overall I'm pretty much happy with this ... MoreSound, it has a very slight warmish tint, yet also the upper frequencies seem to be just slightly elevated as well giving it a smooth yet detailed experience. Build quality is exceptional, features that it has is awesome. It pushes my Edifier S880DB speakers with ease, and it's super simple to switch from speakers to headphones with a simple switch. I do have two problems with it, one is the inscriptions next to the buttons, I can barely read them which is a pain, the other is the power. It will power mostly everything I have, but if you have a higher Ohm headphone you might want to connect an amp to it for those occasions, I ended up attaching an iFi Zen Can to solved this problem without sacrificing the sound somewhat. Overall I'm pretty much happy with this setup, cleared all the other amps/dacs off my desk and this is my main setup.
I'm a multiple purchase customer from Apos and I've never been disappointed with their products or customer service. I bought a Topping D90 (AKM4499) a few years ago and was very pleased with it. Apos was quick and courteous when I had to return jt for service when it just kinda died after nearly a year. I then tried the D90 with ESS9038 Pro, but returned it when I really found no real differences from my first D90. I gave my D90 to my nephew when he went off to college, so it was time to find a new dac.This K9 Pro ESS is a different story from anything I've heard before. I'm so impressed with the sound it produces. I use it as part of my PC audio system (KEF LS50 Metas, Crown XTi 2002, SVS 3000 Micro). I'm not a headphones guy, so can't comment on that function. ... MoreI'm a multiple purchase customer from Apos and I've never been disappointed with their products or customer service. I bought a Topping D90 (AKM4499) a few years ago and was very pleased with it. Apos was quick and courteous when I had to return jt for service when it just kinda died after nearly a year. I then tried the D90 with ESS9038 Pro, but returned it when I really found no real differences from my first D90. I gave my D90 to my nephew when he went off to college, so it was time to find a new dac.This K9 Pro ESS is a different story from anything I've heard before. I'm so impressed with the sound it produces. I use it as part of my PC audio system (KEF LS50 Metas, Crown XTi 2002, SVS 3000 Micro). I'm not a headphones guy, so can't comment on that function. This K9 does a superb job with games, music, and streaming video. The sharpness typically associated with ESS dacs isn't there at all, at least not to my ears. My neighbors probably ain't too pleased when I blast Nine Inch Nails for hours, but that's their problem. As far as I'm concerned, my endgame dac is sitting on my desk now.Big shout out and thanks to Shiela and all the gang at Apos. They were great keeping me posted on my order's progress. Shiela always answered my questions quickly, too. I can't recommend Apos and this amazing dac highly enough!
The FiiO K9 Pro is a decent product capitalizing on the THX technology from the company that burned down (literally) and Chinese manufacturing is unfortunately coming alive in the K9 Pro.The output power is enough to drive the Abyss Diana V2, but there is no much headroom available, since the output power is not very big.I liked the sound that I got when pairing it with my HD800s, it cut some of the edges on high frequencies and it made it very pleasant to listen to (the HD800s peaks are still there but it was more enjoyable than when using my AAA THX Decamp) - (HD800s sounded nice with the knob at 12 o'clock)I returned it because of this specific reasons:1. The volume knob. It felt great! It is BIG! BUT....in less than a day of use, it started to make a squeaky ... MoreThe FiiO K9 Pro is a decent product capitalizing on the THX technology from the company that burned down (literally) and Chinese manufacturing is unfortunately coming alive in the K9 Pro.The output power is enough to drive the Abyss Diana V2, but there is no much headroom available, since the output power is not very big.I liked the sound that I got when pairing it with my HD800s, it cut some of the edges on high frequencies and it made it very pleasant to listen to (the HD800s peaks are still there but it was more enjoyable than when using my AAA THX Decamp) - (HD800s sounded nice with the knob at 12 o'clock)I returned it because of this specific reasons:1. The volume knob. It felt great! It is BIG! BUT....in less than a day of use, it started to make a squeaky sound. I always treat my gear with care, and I was surprised that the K9 was doing this already within a day. So, I wanted to say the build quality is great for the price, but I can't say that when the knob is behaving this way. Also, the adjacent buttons are flimsy like on the THX Decamp from Monoprice.Also, I had this thoughts:1. Many headphone reviewers don't mention the fact that THX company that used to make those awesome AK4499 burned down in 2020 and all the remaining stock are now "collectors" items. Therefore, if your AK4499 turns out to be defective... it might be virtually impossible to replace since the company won't be making more AK4499.2. I wanted to replace my THX Decamp that is now a discontinued product for the K9 Pro, due to the better sound quality. However, it could not feed my Diana V2 with enough headroom available.If you don't mind any of those issues, the K9 Pro sounds sweet and powers most headphones wellApos was excellent at working with me on the return of the item.
The FiiO K9 Pro arrived quickly. I have been enjoying it with my HD 650, EMU teak, Hifiman Arya and Final Audio Pandora VI the last few weeks. The sound quality is excellent. It is warm with terrific resolution and staging. I also have the Topping D-90. The K-9 Pro might be a touch warmer and the D-90 a bit more spacious.My only comment is for a little bit more power , that would make the K-9 Pro perfect.
This desktop dac/amp sounds amazing. Those AKM Dac's sound smooth, detailed and very musical. Beautiful build and feature set too. Simple,elegant and very satisfying. The THX amps are the perfect sonic match for the dac. Works great with my Audeze LCD X cans . Highly recommended!
Great all in one system.Only thing i have noticed is that occasionally the Dac will drop connection from the computer at times. Which will require you to turn it off and back on again. Does not happen when listening to music which is the primary reason i bought it for, but tends to happen if you are playing games. But this may be a side effect of the system overheating possibly.Overall though I am enjoying it. Bluetooth functionality could also be a bit better with the Fiio phone app, but overall it does the job as well.Happy with my purchase for the price.
| Form Factor | Tabletop |
| Number of Headphone Channels | 3-Channel |
| Recommended Headphone Impedance | 16 to 600 Ohms |
| Other I/O | 1 x Coaxial SMA Antenna |
| Wireless Connectivity | Bluetooth (Audio Streaming, Mobile App) |
