Accessories Review of FiiO X7 Android Digital Audio Player (DAP) w/SRC bypass with lots of pics!

Dual-mode operation.

I already mentioned that FiiO found a way to overcome Sample Rate Conversion (SRC) enforced by Android OS. As a result, their Music app utilizes its own driver to communicate with ESS9018 DAC without SRC handicap. But you still have to deal with a burden of Android OS system running in the background and all the corresponding processes and apps, some of which are not easy to disable manually. This will contribute to excessive battery drain and taking away CPU resources, especially when dealing with decoding of hi-res lossless audio formats.

To mitigate this problem, FiiO came up with a dual mode operation where you can boot up X7 into a regular Android Mode with everything loaded at the startup or a Pure Music mode where FiiO Music app is loaded as a default Launcher and you can't exit into a regular Android interface. This Pure Music mode is highly optimized to load only specific drivers/processes required to run their native music app and nothing else besides it. This dual boot switch could be accessed from notification bar or in a setting menu, just keep in mind after making a selection - you will need to reboot X7. Also, if you want to upgrade firmware, you need to boot up into Android Mode. In summary, Pure Music mode turns X7 into a touch screen DAP running one specific FiiO Music app without access to internet, streaming, or anything else associated with it, though you can still enable BT for wireless listening.

Android mode is you typical full mode where you can install and run different apps and widgets. But, there is a limitation to that as well. X7 doesn't support Google Play store and as a result you will have to side load apps (apk files) except for those which do require Google Play for registration. To make things a little easier, FiiO included a folder with "whitelisted" apps to download directly to X7. The list is limited, so you better off Googling for some of your favorite apk install files. One thing to keep in mind, the performance of X7 is optimized in Pure Music mode with their native Music app. In Android mode this optimization is out of the window. It's convenient to run your streaming apps, like Spotify, Tidal, Pandora, etc., but battery drain is rather noticeable. One thing for sure, I wouldn't recommend putting FiiO Music audio widget on the screen because it drains battery like crazy.

I think implementation of Pure Music mode was a great idea, though FiiO music app is still work in progress. In Android mode – you’re faced with a typical Android "smartphone" performance where battery drain will be a quick reminder that you are no longer dealing with a dedicated DAP. But now you can run streaming services or load another audio player app. Luckily, you can gain back the performance by switching to Pure Music mode where I was able to keep X7 in idle for 2 days and 3 hours.













With Spotify / HibyMusic





FiiO Music app.

I'm sure by now you realized the importance of FiiO Music player app - it's your gateway to an optimized X7 performance and to get the best of ESS9018 DAC. Yes, you can boot up in Android mode and use any of your favorite music app and I guarantee it will sound great with your 320kbps mp3 or FLACs, but for a true audio purist who demands the best - FiiO native Music player app is the way to go.

Unlike a number of other people, I don't have a huge library of hi-res music with numerous albums collected over the years. I'm still a certified EDM-head who listens to a lot of separate tracks. Also, I have a collection of carefully selected tracks from various genres I use to analyze performance of audio equipment I review. That is a reason I usually don't lose my sleep over improperly tagged files which is a must for those who rely on a proper sorting of the songs/albums. As a result of my listening habit, I have a lot of loose songs and often organize them by partitioning into folders. Thus, I usually focus on the usability of the app in terms of a general song/folder navigation and playback.

With all that in mind, my personal opinion about FiiO Music app is actually not that bad, though it's not as intuitive and requires some learning curve. Upon start up you have the first screen with a last played track in the upper 1/3rd of the partitioned screen - you can flicker to skip the song or use hardware transport control to hit play button to start playback. Underneath, you have a selection to access Favorite playlist, Folders, or DLNA streaming. Right below it you can access either Recently Played or Most Played songs. Clicking on artwork of the track thumbnail at the top will bring up the main Playback screen.

Going into Folders link brings up another screen with Local Music list where you have more choices to scroll through All the songs, sort by Artist, sort by Album, sort by Genre, and access Local folders. While making a selection through these choices, you have a narrow playback bar at the bottom with a thumbnail artwork of the currently playing song, scrolling name, and Play/Pause and Skip buttons. Clicking on that playback bar opens up the main Playback screen as well. I found going through All the songs and Folders to be more useful for my style of song browsing. But it gets a little confusing now between the first start up screen and this second navigation screen, where in my opinion they have to be combined - list of Favorite songs should be part of the sorting choices. Also, in the Folder view, I don't want to see every single Android OS folder, but would prefer to select and to display only the folder where I store my music locally and on micro-SD card.

The main Playback screen is where things start to shape up to my liking! In top half of the screen you have area to view artwork of the song or a default image if artwork is not available. Tapping it once shows embedded lyrics (if available, and a new setup icon where you can scroll or change the font size), tapping second time brings up info about the song. This part of the screen also has in the upper left corner an icon to bring you back to the first original screen of the app (why?) and in the upper right corner a search icon. In the middle you have a playback progress bar with a scrolling song name and at the left edge of it index number of a song and a total number of songs in the current playback folder. Swiping screen left-to-right brings out a list of all the songs in the currently playing folder, and swiping playback progress bar will fast forward through the song.

Lower part of the screen has Playback and other Control buttons. In the middle you have Play/Pause with a current playback time above it. To the left of it you have icon to access Graphic EQ, turn BT on/off, change playback loop mode, and Skip back. To the right of it you have Heart icon to tag song as Favorite, an icon to access more option to provide a detailed info about the song or to delete the song, icon to add the song to your Playlist, and Skip forward button. By holding a finger along the right edge of the screen brings up a volume slider menu to adjust the volume. In EQ screen, you have access to 10-band equalizer, actually with a very nice graphic representation in the upper part of the screen. Lower part of the screen has access to 5 band sliders with +/- 12dB adjustment, but there is no frequency label to indicate which band you are adjusting - this has to be fixed because it gets confusing when you flip to the next 5-bands and don't know which band you are adjusting. You can see the graphical representation of the adjustment, but you doing it blindly because sliders don't have a frequency indicator. Sliding finger up brings up 8 EQ presents (genre related) and 1 custom preset. All 8 pre-defined presets could be adjusted further. Also, on the main playback screen there is no indicator of EQ selection, something I would like to see being implemented in future updates.

In my opinion, FiiO Music app has a lot of potentials and considering it's still a work in progress - I will continue to look forward to more updates. Flexibility of Android interface opens up a door to shape this music app to perfection where sky is the limit. Yes, it is still work in progress, but I have a hope that progress will pick up soon, the way how I have seen it with sound tuning improvement.











Sound Analysis.

Often people get a dedicated DAP because they are not happy with audio performance of their smartphones, and then they realize they miss streaming capability and touch control of their phone and decide to look for usb DAC stack. With X7 you have a chance for a dedicated DAP with touch controls and streaming capability and different amp modules – all integrated in one compact design. FiiO is known for their budget oriented products where their DAPs usually considered having mid-fi performance. X7 is a big step up, nearly doubling the price of their previous X5ii flagship with high expectations to determine if FiiO was able to finally cross the threshold of summit-fi performance.

When I received X7 with its initial beta FW release, I was a little bit disappointed. Not necessary because it sounded so bad, but rather because I set my expectations very high. I didn't feel that sound was on a level of summit-fi performance. I quickly attributed that to a beta firmware and a default IEM module, assuming that fw is still work in progress and amp module will be updated with different versions. Following that, a few more fw updates were released and I started to notice an improvement. But not until the last FW 1.1 update I realized that FiiO means serious business and finally started to unlock a true potential of the ESS9018 DAC paired up with their IEM amp module.

Based on the latest FW 1.1, I'm hearing X7 to have a neutral and slightly warmish signature with a very clear and detailed sound. It doesn't necessary strike you with analytical micro-detailing, but it definitely leans more toward a more revealing sound signature. The layering and separation is pretty good (improvement over the initial fw release), sound never gets congested, but the transparency is not at the highest reference level and I actually hear a little thickness in a sound, thus my reference to a slightly warmish signature contributed by a fuller body of lower mids and some noticeable impact of lower end. Soundstage width/depth/height is slightly above the average where sound has a more intimate feeling, yet placement of instruments is still very convincing.

Based on what I hear across different headphones, I find X7 to have an excellent impact and speed at the lower end and a decent extension. Bass is well controlled and that is one of the reasons why I hear such a high level of clarity and details because bass is confined without spilling into mids. Lower mids give some nice thickness to a body of the sound, but they are not too thick. Upper mids are full of details, but not too analytical, treble is clear and has a nice definition without contributing to sibilance.

Describing a DAP by itself is not always helpful, thus I prefer to include a relative comparison to some of my other DAPs to give an idea how it stacks up against the competition.





X7 vs PAW Gold - LPG is more neutral, soundstage wider/deeper, I hear more transparency in the sound, while layering and separation is similar.

X7 vs L5Pro - similar neutral-warmish sig, L5P soundstage is a little wider, other than that sound is very similar in layering/separation, even matching the dynamics. But overall L5P sound is tighter and a little faster.

X7 vs AK120ii – AK has a very similar neutral-warmish sig, soundstage is a little wider, bass has a touch more impact, but everything else is very close in performance.

X7 vs QA360 - 360 is slightly brighter (leaner lower mids), soundstage is wider/deeper, mid-bass has slightly more impact; overall sound of 360 is a little smoother.

X7 vs LP5 Gold – similar sound signature, LP5G has a little wider/deeper soundstage, more transparency and faster speed, and slightly better layering and separation, but the gap is not that wide.

X7 vs N6 - N6 is a little brighter (neutral-bright), soundstage is a little wider, very similar dynamic sound and separation/layering. The bigger difference is that N6 sounds a little leaner in comparison. X7 has more body and sounds more musical.

X7 vs X5ii - X7 has a fuller sound with more body, also more natural tonality. Soundstage is rather similar. X7 sound is a little more dynamic, and has a slightly better separation/layering of a sound.

To test the DAC output of X7, I connected LO to different external amps.

w/E12A - a great pair up where the sound is very close to HO of X7, but w/E12A you get a little more transparency. Makes me wish FiiO would have used MUSE02 amp in their IEM module.

w/VE Runabout - excellent pair up, improves dynamics, improves width/depth, sound becomes more transparent, layering/separation is also improved.

w/HA-2 - nice pair up, improves soundstage depth, also makes sound a little bit warmer (adds more body to lower mids).

w/C5 - nice pair up, improves soundstage width/depth, also makes sound a little bit warmer.



For those who are wondering if they should get X7 or external USB DAC to pair up with their smartphone, I tested N4 with HA-2 to find:

X7 vs Note 4 w/HA-2 - X7 sound has a little more transparency and sounds a little tighter, otherwise a very similar performance.

Pair up with different headphones.

Though you have option to select high/low gain, I found the sound in high gain to have more energy and to be more dynamic. Thus all my headphone testing was done with X7 set in high gain, and I also indicated a volume level for each. Not every pair up turned out as I expected.

ES60 (35/120) - some hissing, nice clean detailed sound, good low end expansion, good transparency.

ZEN (83/120) - high gain is the way to go with these 320 ohm earbuds, though X7 doesn't drive them to a full potential, especially when it comes to bass which lost a little bit of weight/body and sound is a little mellow (not as fast or tight).

Savant (49/120) - very clear detailed smooth sound, modest sub-bass quantity (sub-bass rumble is there), excellent soundstage expansion, nice transparency.

W60 (45/120) - smooth warm detailed sound, a bit more on a laidback side, missing a little bit of speed.

UM Pro 50 (42/120) - deep bass impact, nice smooth detailed sound, good dynamics, missing a bit of sparkle at the top.

DN2kJ (52/120) – not the best pair up with these 8 ohm IEMs; bass missing some sub-bass texture and upper mids/treble a bit too revealing/harsh.

MSR7 (56/120) - excellent pair up, clear detailed sound, good soundstage expansion, nice transparency and great retrieval of details.

PM-3 (70/120) – excellent pair up, drives them with authority! nice punchy bass, good soundstage depth, clear detailed sound.

EL-8C (80/120) - doesn't drive it to full potential, bass is not as tight and missing sub-bass texture and treble has a little bit of metallic sheen, sound is a bit thin.

R70x (95/120) - excellent pair up with these open back 470 ohm cans, clear detailed sound, excellent transparency, but pushing it closer to X7 max driving limit.



Conclusion.

It’s hard to evaluate X7 as a finished product because I didn’t get a chance to test different amp modules and the firmware is still work in progress, but so far it shows a lot of potential. As a matter of fact I was very impressed with the progress of sound improvement from the day I received X7 to the latest FW1.1 update. At $650 it still represents a great value considering high performance desktop quality DAC, wireless connection with access to streaming services, modular amp design, and touch screen interface. More work needs to be done to finish their Music app and probably to optimize DAC performance with new amp modules, as well as a desperate need for a good case. But if you take into consideration this is their first Android-based release, I think it turned out pretty good! Just like with a classic X5 and their mechanical wheel introduced and later improved throughout X1/X3ii/X5ii releases, FiiO is breaking their own new grounds with X7 release which I’m sure will get only better moving forward toward their ultimate goal of setting the World on FiiO-R!

Ready, Set, Go!!! $650 w/free shipping, limited available stock: http://www.miccastore.com/fiio-andr...s-music-player-early-release-units-p-148.html

Also, finally on Amazon

This is a review of FiiO X7 accessories. http://fiio.net/en/products/49, leatherette and leather cases available on Amazon: http://www.amazon.com/dp/B01B2D1336/?tag=vectron00-20 and http://www.amazon.com/dp/B01B2DHQIM/?tag=vectron00-20

Just like with smartphones, many people enjoy personalizing their DAPs and search for accessories to make their gadget stand out from the crowd. Some accessories are not just about the visual enhancement, but also the improvement of usability and safety. Here are a few essential ones released by FiiO for their latest X7 flagship.

FiiO X7 Stickers (ST-X7) – available from FiiO Aliexpress store http://www.aliexpress.com/store/product/Sticker-for-FiiO-X7/1473108_32563966868.html for $6.90

Here you will find 5 sticker kits, each one with 10 self-adhesive textured pieces that feel like a vinyl sticker to the touch. Each of these kits correspond to a specific theme with Carbon fiber, Light wood, Dark wood, Shield (resembling Captain America), and Spider (resembling Spider-man). With a material being textured, they actually enhance the grip, making X7 slick metal body not as slippery, and can also enhance the fitment into the case. I personally didn’t apply one yet and not sure if I will since I prefer using the case, but I can probably see myself using a set with carbon fiber finish. One thing to keep in mind, X7 amp modules are removable/replaceable and different modules will have different port opening at the bottom (between 3.5mm and additional balanced port). Thus, if you want to keep your X7 covered head-to-toe in stickers, take your time to decide which amp modules going to get it!

















FiiO X7 Tempered glass screen protector (PF-X7) – Available from FiiO Aliexpress store http://www.aliexpress.com/store/pro...ass-screen-protector/1473108_32566963466.html for $10

While using a sticker is a matter of personal preference, I highly recommend the tempered glass as a must have accessory. X7 comes with a regular film screen protector which only protects display glass from scratches. If you drop your X7 face down or drop something on top of it – the glass can easily crack or chip. Tempered glass absorbs some of the impact and if/when it breaks – your display glass stays intact. This is Japanese brand Asahi glass with a typical 9H hardness rating and anti-scratch finish. I also have a feeling it has an oleophobic coating since it kept fingerprints off.

Application of this tempered glass screen protector was very easy, just have to remember to remove default film screen protector from X7 first, clean the glass with a provided alcohol wipe, remove the sticker off the glass, align and press it down squeezing all the bubbles from the center outwards. Right after application there was a few “wet” spots but they disappear within hours. Also, this screen protector works great with FiiO protective case. I did test sliding X7 in and out at least a dozen of times and glass stayed securely attached.

FiiO X7 leatherette (LC-X7A) and full leather (LC-X7B) cases. Both cases are available from FiiO Aliexpress store: http://www.aliexpress.com/store/product/leatherette-case-for-FiiO-X7-LC-X7A/1473108_32584272247.html (leatherette for $14.99) and http://www.aliexpress.com/store/pro...e-for-FiiO-X7-LC-X7B/1473108_32584288008.html (real leather for $18.99). If you don’t have account on Aliexpress, you can try Penon (http://penonaudio.com/FiiO-X7-Slide-in-Case) or on Amazon (http://www.amazon.com/dp/B01B2D1336/?tag=vectron00-20 and http://www.amazon.com/dp/B01B2DHQIM/?tag=vectron00-20), though you will end up paying a slight premium.

I only received leatherette case which is a synthetic leather case (PU material), but found it to have a very convincing leather finish with a fake stitching and overall nice build quality. While having synthetic leather outside, inside it has a soft felt material protecting X7 shell from scratches and extra padding at the top to even out the battery hump. At the top of the case you have a generous cutout around LO port, and Left/Right sides have a symmetrical oval opening/cutout for the control buttons. For me personally that was the biggest advantage of using this case since now I was able to get a good grip around X7 without worrying of pushing buttons on the opposite side of X7 shell. As a matter of fact, the cutout made these buttons recessed, protecting from accidental pressing – perfect to carry in your pocket.

The bottom of the case was completely open to allow X7 slide in and out with ease. For a basic everyday use X7 stays securely in, but if I throw my arm down with some force – X7 did slide out by about an inch. It didn’t fly out, which is good, and was convenient for removing the DAP. The same with connected headphones, if I pull on the cable at the bottom – I was able to slide X7 out. I’m sure if I would have applied stickers, the fitment would be tighter. Overall it stays secure inside of the case, but it’s not 100% secure as if you would have with a fully enclosed case.

I also really liked the fact that now my display was recessed and I was able to place X7 face down on the surface. As I mentioned before, there was no interference with tempered glass screen protector. The only thing I wasn’t too happy about was the case covering the glowing blue light underneath of the display. Coincidentally, I read another impression where this wasn’t a problem and light was exposed. This suggests a marginal variation between builds. I know that some people don’t even care about this light and permanently turn it off. But for those who find it useful, just be aware that you might end up with a case covering it, unless if you can get a piece of sandpaper and expand the screen opening at the bottom.

Overall, in conjunction with a tempered glass this case does a great job protecting X7 DAP and enhancing its functionality. For under $30 (case and glass), this is a smart way to protect your $650 investment.

This is a Review of FiiO K5 Docking Amp. http://fiio.net/en/products/46, available on Amazon http://www.amazon.com/gp/product/B01BBX1NNM/?tag=vectron00-20

Can you refer to a docking desktop amp as “jack of all trades”? You certainly can when you start playing with FiiO’s latest K5. Prior to receiving it, I was expecting K5 to be a desktop accessory for X7 only. But was I wrong! In addition to being compatible with FiiO’s latest X-series DAPs (X1/X3ii/X5ii/X7) and their E17k DAC/amp, it can also work with other audio sources connected to RCA Input, and even take advantage of DAC processing inside of a docked DAP while feeding audio from your laptop. After spending over a month with it, here is what I found.



Unboxing & Accessories.

Arrived in a sturdy cardboard packaging box, I like how FiiO choose to have an all black background with a glossy image of K5 and a docked X7 popping out in “3D” from the front cover. All the promotional pictures of K5 I’ve seen featured X7, but make no mistake – it’s intended to work with other FiiO X-series DAPs. The back of the box has a detailed spec, including a very impressive output power rating for such a compact desktop amp.

Before opening the box, I did take a notice of the weight since we are dealing with an amp, though later turned out that part of it was contributed by external power converter. Once taken out, you can feel that the actual amp is not that heavy at 450g, packed into 120mm x 130mm x 55mm compact enclosure. The power supply converter is external, a typical AC/DC supply with 15V/1.5A output you can find with a number of laptops. As a matter of fact, my review unit arrived with non-US plug and FiiO kindly included an adapter which got temporary misplaced, so I ended up using power converter from my old Thinkpad.

Other included accessories were 4 rubber bumps/feet, 2 insert adapters for different DAPs, usb cable (full size usb-B to usb), 1/4” headphone adapter, and a user guide. Considering a number of all the inputs and outputs, it would have been nice to see other cables included with accessories, for example a pair of RCA to 3.5mm cables or 11pin micro usb connector, and maybe balanced 3.5mm cables. Of course, these extra cables are not a showstopper to get you going, but still would have been great to see at least FiiO’s proprietary 11pin micro-usb interconnect cable. The docking can only accommodate X-series DAPs without a case/skin, and you need to use this extension cable connected to “dock in” micro-usb port on the back of K5 if you want to keep your DAP dressed.






Accessories.





Design.

Since I’m into portable audio gear, I rely mostly on standalone DAP use, though have one desktop amp and a handful of portable amps. In my opinion, K5 design fits somewhere in the middle. It’s obviously a docking amp designed for a desktop use, but it doesn’t weight a ton especially since power supply is external to the case. It’s lightweight, but still has a solid build with a nice titanium color aluminum shell. It has a relatively small footprint that not going to occupy too much space, and yet it is sturdy enough on a flat surface. As a matter of fact, I dragged it next to me on a couch and had no problem using it even so the surface wasn’t perfectly flat. Ergonomics of the design and tight fitment and placement of the micro-usb connector contributes to a nice weight distribution without anything tipping over, even with X7 docked.

With K5 being a “docking” amp, the key feature of this amp is micro-usb docking port on the top under the flip panel. When not in use or using external ports, the panel is flush with a top surface with an exception of a small tab to open it up. The flip panel mechanism is smooth and the panel turns into a solid back support of a docked device when flipped open. Inside you can see a pocket to cover micro-usb connector when it’s closed and another elongated pocket for a rubber adapter to accommodate different DAPs, depending on thickness variation.

The main focus of the front panel is a large rotary volume knob that also functions as a power switch once you turn it clockwise, greeting you with a brief red backlight glow while it initializing and then turning blue. I absolutely love this detail which matches X7 blue light for a visual feedback when power is on. Turning the power on will also turn the power on X1, X3ii, X5ii, X7, and E17k, and the same when you turn it off, though you can dismiss power-off from the DAP screen. And with power on, your DAPs will also be charging. The knob is big, yet easy to grip, has a perfect potentiometer resistance for a better control of the adjustment, and a clear white marker indicating rotary position which goes from -90 dB to 0 dB.

The front panel (the same as a back panel) is slightly recessed with a nice bezel trim design, and you can find to the left of the knob Input switch for Dock vs Line selection and Gain switch for Low (0 dB), Mid (6 dB), and High (12 dB) gain setting. Input switch will correspond to a source selection of either DAP from the dock (or micro-usb “dock in” port) or the Line input. In High Gain you can drive your HO output with a VERY impressive 1.5W (32 ohm load) power which scales down to 150mW (300 ohm load), and most likely with enough juice to drive your 600 ohm cans. I found these flip switches have a nice click action. To the right of the knob you will find 1/4" headphone output, keeping in mind that 3.5mm adapter was included with accessories. I was happy to see FiiO didn’t clutter the area around HO with switches, keeping it clean.

The back panel of K5 reveals a Power in connector jack for 15V supply, all the way to the right, and a number of additional connection ports. You have usb-B USB IN connector for digital input from your computer while processing a signal through X3ii, X5ii, X7, or E17K internal DAC, DOCK In input for 11pin usb interconnect cable if you can’t dock your DAP (due to case/skin), a pair of RCA Line In and Line Out connectors for external input connection from any audio source and to other audio source inputs, and Balanced Line Output. This dual 3.5mm Balanced Line Out output can be used only in conjunction with X5ii or X7 to connect to another external amplifier stage.

Sound Analysis.

While testing K5, I focused on 3 main pair up scenarios with docked DAPs, external connection from LO of the DAP, and digital input from my laptop. In every case I found K5 as an amp to be rather neutral, transparent, and contributing to a noticeable soundstage expansion (especially in width).

Of course, pair up with X7 was at the top of my list. By default, this flagship DAP from FiiO comes with IEM amp module which does a good job with in-ears and other efficient headphones, though I have to keep it in high gain. K5 pair up really stepped up X7 performance with a deeper sub-bass, more organic mids, and additional sparkle in treble - a very consistent improvement I found across R70x (470 ohm) and both planar magnetic PM-3 and EL-8C. Another change was in soundstage expansion, in all three dimensions of width/depth/height where width was the most noticeable. I can't judge yet how other X7 amp modules going to compare, so keep in mind this is relative to IEM module.




Docked with FiiO other DAPs, I found X3ii + K5 pair up to make sound more transparent, with a slightly improved dynamics and expanded soundstage, and with X5ii + K5 a found more body in lower mids giving sound a little smoother organic tone, and also the improvement in soundstage expansion.

Docked with X5ii




Docked with X3ii




The docking convenience of FiiO DAPs is great, but K5 is not limited to only that and can be paired up with other DAPs. Using a common RCA to 3.5mm cable you can feed Line Out of any DAP into Line In of K5. I went straight to the top using PAW Gold as my guinea pig for this test, as well as AudioQuest Evergreen RCA to 3.5mm cable, and ended up with a big surprise. Using Beyer's T5p 2nd gen, I found PAW Gold HO to sound nearly identical to PAW Gold LO + K5. Sure, there could be a few subtle differences, but overall it sounded very close where K5 combo even had a slightly wider soundstage.



Last but not least, I put to the test my ThinkPad T430s driving USB In through DACs of the docked X3ii and X7 while monitoring through T5p 2nd gen. This was really a proof of concept just to verify that both of the DAPs will be recognized by my laptop while docked, function as expected in USB DAC mode, and able to play FLAC files from Foobar2k on my computer. Everything worked flawlessly, with a loud and clear sound improvement. Pretty much anything would be a sound improvement over my laptop's HO from integrated motherboard sound chip. But it also fared very well against a number of my other USB DACs, especially in conjunction with X7 DAC where sound became more dynamic, more detailed, and with a consistent improvement in soundstage width.





Conclusion.

For sure you can call K5 a docking "jack of all trades" and "master of expanded dynamic sound". This latest FiiO docking amp is quite versatile in boosting the performance of portable FiiO DAPs as well as any other DAP, and you can also use it connected to a computer/laptop as USB DAC powerhouse. But among all of this it really shines with X7, replacing its IEM amp module with a more powerful alternative to take full advantage of ES9018S DAC performance. In my opinion, K5 bridges the gap between X7 portable and desktop use where on the go you can enjoy your IEMs and efficient headphones, while at home you can supercharge X7 not only by "charging" it up when docked but also by giving it an extra jolt of output power.

Sorry, only use free Spotify version, so never had a chance for offline testing. I think FiiO mentioned about coming up with a fix, though I don't remember the exact details. Better check head-fi thread where James and other FiiO guys quite frequent answering questions.