The X7 AM5 Module By FiiO
Tonality9
Build & Function8
Matchability9
Value For Money8
8.5Our Score

Modules for the FiiO X7 DAP are now coming thick and fast with the public launch now of the AM5 and as I write we just received the AM3 (review later guys!). I was actually very impressed with the AM2 for its flexibility with both portable headphones and IEM’s, more so than the more neutral and flatter IEM module. So much so I have not taken the AM2 off the X7 since receiving it.

Naturally a module that is adorned with the words “High powered” has me licking my lips to be perfectly honest. Balanced is just around the corner with the AM3 but in the meantime the AM5 should, on paper, be the module of choice for high impedance headphones and costs just $99 in most markets (check your own retailer for the exact price as it can vary a little depending on the market you are in.).

Just an FYI FiiO recently announced that they would be selling the X7 without the default IEM module at a slightly lower price. This is excellent news for those who wish to pick a module to pair with their X7 and not forced into buying the IEM module.

What is it?

The third release in a series of amp modules for the X7, the AM5 is their highest powered module to date and specifically targeted to those who wish to run full sized headphones with higher power ratings or higher impedance ratings than what the AM2 or IEM module could cater for.

As such the specs on paper for the AM5 power-wise are considerably higher than either than the previous two modules with the AM5 delivering 0.5w into 32 ohms and almost a full watt into 16 ohms which is more than enough for just about any headphone rated at 32 ohms or less. It can also deliver 55mW into 300 ohms so it is worth visiting the likes of the HD800 to see if that will translate into appreciable sound quality and juice for the German flagship headphone.

In context, the IEM module, or AM1 delivered 200mW and 100mW into 32 ohms and 16 ohms respectively and the highly enjoyable AM2 still falls way short at 350mW and 300mW into 32 and 16 ohms. Granted this is intentional but it will be interesting to see how the AM5 deals with IEMs compared to the other modules. Could this be the one module to rule them all?

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Specifications

New Buffer

FiiO has made a small but important change to the internals of the AM5 by keeping the JRC MUSES02 opamp from the previous AM2 module and changing the previous BUF634 buffer to a TI TPA6120A2. With the retention of the MUSES02 in the AM5, you can still expect the same level of coloration you found in the AM2 not to mention a greater power output from the AM5.

Dynamic Range & Voltage

The TI TPA6120A2 is specifically designed to handle high powered output audio signals whilst retaining excellent low levels of distortion as well as yielding up to 128dB of dynamic range. Note, the AM5 though is listed as greater or equal to 120dB of dynamic range, which may be a conservative estimate or a limitation of the design of the AM5.

FiiO pretty much expects users of the AM5 are going to be running in high gain with decent volume on heavy duty cans. The AM5 really needs to be able to tolerate that frequent current-on-demand without falling apart with stupidly high noise floors and degraded SNR.

Output resistance levels stay relatively the same with both the AM3 and AM5 showing 0.5 ohms output resistance. Voltage output on the AM5 is 11v which is around 25% higher than the AM2 at 8.8v and more than doubles the AM1 which is rated at 5.2v.

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Change Over

Attaching the AM5 is the exact same process as the AM2 by detaching two screws on each side of the X7 using the supplied T5 screwdriver that came with your X7 (do not lose this as the modules do not come with a spare one). Once unscrewed you simply slide out the existing module, take the cap off the inside of the AM5 card, slide back in and put the screw back in. Once again, note in the top corner of the display for the AM5 notification to ensure your module is correctly inserted and working. You can do the changeover without turning the X7 off (hot swap), but FiiO does not advise doing that give that it is a live connection.

FYI for those that have had their FiiO X7 for a while you will need to upgrade your firmware to at least FW1.91 when trying to output audio with the AM5 attached.

Battery life

Unsurprisingly the higher power output of the AM5 means you will get less out of the X7 battery than the AM2 and AM1 modules. This time, FiiO are quoting on paper around 6 hours compared to 8 from the AM2 and 9 for the AM1. That’s a 30% drop overall and it has been a very long time since I handled a DAP with 6 hours or less. 6 hours though should be considered a best case scenario though because often I came up in the 5-6 hour marker or even less if I was using WiFi and streaming from Spotify.

I did get close to or slightly beyond 6 hours if I toned down the superfluous menu operations, killed a few processes and kept the screen off. It will not be the commuters’ choice to be honest but then again grabbing an HD800/X7(AM5) combo on the 830am from Chiswick is not going to be high on practicality. Consider this more of a transportable or home based solution using the AM5 perhaps with the dock or the DAC out.

Sound Impressions

Tonality

This time, the tonal differences are a little subtler between the AM2 and the AM5 than previously comparing the AM2 to the AM1. After all, both share the same MUSES02 DAC with only the buffer chip variation between them physically. The AM5 still plays to the same broad strengths of the AM2. This is a much more musical signature, more low-end grunt, and better body than the AM1.

What sets the AM5 apart tonally from the AM2 is the additional power the AM5 is adding to the equation. It really ups the dynamics and engagement over the AM2, making the AM2 the slightly softer and politer of the two in comparison. If anything the AM5 just sounds that bit more aggressive than the AM2. There is a touch more clarity and with EDM and hard rock, the AM5 does hit a little harder with slightly more sub bass presence. Neither modules could be considered neutral, at least not in comparison to the AM1, but I do like what I am hearing from the AM5 just that bit more than the AM2.

IEMs

In much the same way the AM2 is a versatile and flexible amp the AM5 is perhaps even defter at handling a wide range of earphone and headphone with low noise floors for sensitive IEMs and even more power on tap for a wider range of headphones.

Volume levels are a little misleading for the AM2 and AM5 for sensitive IEMs. There is a small difference perhaps about 2-3 steps max between the two modules for IEM’s like the Campfire Jupiter and Shure SE846. I got to around 30-35 for both before finding the dB level just a bit much for my ears with both IEMs. Power is not a huge requirement with neither of these two drawing huge amounts of current. The tonal differences though between both modules are appreciable even on low gain low volume with highly sensitive IEMs and the noise floor is excellent with no discernible hiss.

Whether you need that additional power for most IEM’s is debatable. Certainly for hugely power hungry IEMs like the new oBravo planar IEM range (ERIB) the AM5 is perfect and really needs that additional power sounding just right at 60 steps on the X7 which is a good 25-30 steps higher than the Jupiter and SE846. For these sensitive IEMs the AM2 may provide additional flexibility over the AM5 but definitely on a tonal level, I found the AM5 just that bit more involving.

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Headphones

The AM5 comes into its own when you start using it with less efficient or harder to drive headphones such as planars and higher impedance cans such as the DT1770 and at a pinch the HD800. Not that I am suggesting you ditch your high-end desktop rig for the AM5 but compared to the AM2 the AM5 has more than enough in the tank to drive these cans to acceptable levels without sounding tinny or lacking in dynamics.

Planar Headphones

Efficient planars such as the PM-3/HE400S will sound equally good on either module it really just depends on what type of tonal match you want to go with. Both modules have enough power to drive the PM-3 with ease.

Moving up the chain and though I prefer a full desktop amp, the Ether C nevertheless sounded excellent with the AM5. The AM2 did a decent job but sounded a little softer and more muted than the more visceral and dynamic AM5. Volume on high gain with the AM5 and Ether C was a more than manageable 70 steps. The FiiO X7/AM5 is not quite up there with the Mojo/Ether C in terms of tonal matching. The Mojo has a more expansive soundstage and a heavier low end which really suits the Ether C’s flatter presentation.

Dynamic Headphones

Dynamic headphones such as the DT1770 and AKG’s K812 run smoothly with the AM5 between 70 and 75 steps on high gain which is around 1-3 steps lower than the AM2. The major difference between the 2 modules on these headphones was that fullness in sound, the better dynamics, and a slightly better low-end heft in the AM5 over the politer but smoother AM2.

The 250 ohm DT1770 and the AM5, in particular, was a beautiful match with wonderful extension. This was probably my favorite closed dynamic pairing with the AM5 for EDM and rock, demonstrating excellent staging, an articulate low-end and a clear vocal presence.

Volume wise the AM5 also had no issues with the 300 ohm HD800, sitting comfortably at around 75 – 80 steps. Tonally, though, the HD800 scales better with quality desktop rigs such as the Questyle CMA800R or the tube Studio 6, both big rigs that drive the HD800 with authority offering top notch resolution and tonal qualities.

Having said that, as a DAP, the AM5 does an adequate job with Senn’s flagship, sounding neither tinny nor shrill with decent depth and good resolution but lacking in a bit in width and imaging to truly push the HD800 to optimal levels. It’s not as buttery smooth or rich as say the Continental Dual Mono from ALO Audio and displays a touch more sibilance on some vocals compared to the Lotoo Paw Gold but overall it was a competent display from the AM5 and certainly more dynamic and engaging than the AM2.

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Final Thoughts

So now we have three modules for the X7 all priced at $99 and all offering something different, be it efficiency or power, be it neutrality or musicality. I did say in the AM2 review that I wished you did not have to buy the AM1 with the X7 just to lower the overall cost of ownership of this developing ecosystem for the X7. Thankfully, FiiO has responded to this by releasing the X7 without any amp modules for a lower price. If you want an AM2 or an AM5 now you can have it without having to buy the AM1. Good news for those with a particular usage needs or those simply on a tighter budget.

Sadly, the battery does take a hit, you will lose up to 25% more than the AM2 with the lifespan dropping down to around 6 hours due to the additional power of the AM5. This may not be suitable for those looking for a full day’s use or relying heavily on WiFi streaming. In that regard, you should really take up the AM2 if you want a longer battery life or even the AM1 for maximum battery output if you enjoy the neutral profile of the AM1 with IEMs.

I really am asking for this because the balanced AM3 is on its way for review but right now the AM5 has the edge over the AM2 as FiiO’s best module for the X7. Tonally they have a similar musical profile, negating neutrality for low-end heft and a thicker note than the AM1 but this time, the AM5 offers better dynamics, slightly more slam and generally just a more aggressive tonality that I think suits rock and EDM even more than the AM2.

By contrast, the AM2 is the slightly politer in comparison and whilst I still think the AM2 towers above the AM1 and still very suitable for rock and EDM it doesn’t nail it quite like the AM5 particularly with headphones like the DT1770. As a value add, IEM’s remain relevant. The AM5 still delivers a competent low noise floor and a controllable level of gain even with efficient earphones. Impressive.

Price: $99

Link: http://fiio.net/en/products/49#AM5

Technical Specifications

  • Voltage amplification: Muses02
  • Output power 1: >500mW (32Ω/1kHz)
  • Output Power 2: >800mW (16Ω/1kHz)
  • Output power 3: >55mW (300Ω/1kHz)
  • Frequency Response: 9Hz~84kHz (13dB)
  • SNR: ≥120dB (A weighted)
  • Output: <0.5Ω (32Ω load)
  • Impedance Channel Separation: 72 dB (32Ω/1kHz)
  • THD+N: <0.001% (32Ω/1kHz)
  • Peak Output Voltage: >11 Vp-p
  • Max. Output Voltage: >250mA
  • Drive Ability: 16~300Ω (recommended)
  • Battery: ≥6 Hours Gain: L
  • Dimensions: 64 x 25 x 16mm
  • Weight: 32g Unit 135g including packaging

About The Author

Editor

Founder & Owner of headfonics.com. I first started reviewing in the late 80s (ouch!). Back then it was albums, rock concerts and interviews with a typewriter for the local rag. Now its desktop/portable and digital 2.1 audio on a rather nice laptop. How time flies.

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  • Juan Luis Quiroz Guevara

    Among AM2 and AM5, which one is better paired with he400s?

    • headfonics

      The AM5 for me. More power, better dynamics.

      • Juan Luis Quiroz Guevara

        The fiiox7 + AM5 is enough to show the full potential of He400s ?

        • headfonics

          Ah easily, nice pairing for me.

          • rizki vaizard

            The same question but instead of he400i i use sine. Which one do you think?? Does it reach full potential with AM2 and no need go get AM5 or else??

          • headfonics

            Sadly I have yet to hear the SINE but given its a planar I would opt for the AM5.

          • rizki vaizard

            What’s the differences sonically lets say you use he400i paired with am2 and am5?? What’d you say??

          • headfonics

            Dynamics primarily – a more vivid presentation with the AM5.

  • Clarence

    What about AM3 with balanced po? Review coming?

    • headfonics

      Yup next month.

  • Jerry

    Did you compare the A5 to FiiO’s K5 amplifier? I have HD 800s and am wondering whether to get the K5.

    • headfonics

      We will be this week with our review of the K5 out soon.

  • R23

    I have the ATH M50x’, V-Moda M100 and Sony MDRXB950BT/B, Which one should I get? AM3 or AM5?

    • headfonics

      AM5 as none of those have balanced terminations to make full use of the AM3 balanced output. The AM3 unbalanced is laid back and those headphones are quite visceral and more suited to the weighted M5.

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