The Science of Sound: Understanding Frequency Response and Impedance (2024)

My setup: Thieaudio Monarch MK3, paired with this Sony 707 unit, and music played from Apple Music.
Comparison with: my previous DAC/Amp Jcally AP98, Shanling M6 Ultra

Its been months since I've been using the 700 series portable music player of Sony's and finally got myself up to reviewing it.

So first question: why a DAP? For months, as I was using my AP98 dac/amp connected to my phone to listen to music, I came to realise a very obvious and quite irritating issue: the type-C connector is a nightmare when its wobbling in your pocket. It is not designed to stay tightly fixed. Mainly used for charging and data transfers, I don't think the engineers behind in ever factored the port being used to play music through an amp/dac. And when it is used to play music on-the-go, you'll reach a point when you'll constantly find it getting loose and disconnecting with your device. Especially if you listen to music while doing a lot of walking like I do. There's no point trying to listen to audiophile grade tunes when they are getting constantly disconnected. So, a change had to be made.

For those who don't know, a DAP is a full android environment in itself. Its basically if a phone was designed for one thing, and one thing only: to play music. You can download any android app on it (although it doesn't have a sim card), but you really shouldn't. These things chug a lot of battery to produce the sound that they need to. Slowing them down with other apps is not recommended.
Anyhow, how did this portable music player solve my issue? Well it has the typical 3.5mm audio jack, as well as the 4.4mm balanced output. Connect your IEM/headphone to them directly, and you say goodbye to any "loose" connections. Uninterrupted audiophile sound = happy audiophile.

So how is the device itself? Quite big actually. The length and width is similar to that of your phone, and its much thicker. Will need its own dedicated pocket. I had to do a bit of juggling of my pocket items when I got this, so that might annoy some people. After all pocket spaces are sacred, and this unit is going to force you to change your habit of what goes in which pocket.
So having had my pocket sanctity shredded, there is also another nitpick of how edgy the device is. You could literally use those metal-finished corners as a weapon. Apart from that I'd have also liked the buttons to be a bit more protruding, but thats fine. You don't usually change volume too much anyway.
So those slight negative bits out of the way, the device itself is very nice to hold. Has a gripping pad thingy on the back that makes it very good for my sweaty hands. The display is good, android environment is very operable. Its not your latest gaming mobile phone fast, but much better than old mobile phones.

Okay now that the boring bits are out, lets get to the real thing: Sound!

This is the first sony device that I've used, and now I absolutely get what the "Sony signature" means. Very musical. Very crystal. You'd expect such a signature to be more favouring towards the higher frequencies, but that's not the case. The device is actually slightly on the warmer side, but you can almost miss it because of how neutral the signature is.
Thanks to the Audio Store I've had the opportunity to try out lot of dac/amps & even DAPs, and this has without a doubt been the most neutral sounding unit I remember.

The resolution is brilliant. I mainly use the Monarch MK3s which are already known to be extremely detailed, but only after using this DAP did I feel that I was really starting to reveal the potential of the MK3s. In this department, its hands down better than the Shanling M6 & my old AP98.

The amplification might not be up to everybody's taste, even though this unit DOES have the High Gain option. You might have to turn the volume really up if you have something with very high impedance. Mainly talking about IEMs though, it should be able to play anything.

Where I feel that this player slightly lacks is the richness of sound. Sony has a very clear, detailed sound, but it can sound somewhat leaner, especially when compared to Shanling M6. Especially for someone like me who mostly listens to instrumental soundtracks. Even the little AP98 with high gain, and connected to a computer has a more voluminous sound. It is why I almost ended up picking the Shanling, but immense thanks to The Audio Store for letting me try the M6 unit for an entire day, after which I quickly realised that it was too bassy for me.

Overall I'm extremely happy with the purchase though. This is something I know I'll value for a very long time, even after I maybe try some other DAPs, because of how balanced the sound is. Sony's signature has grown on me, and I'm certain that some songs will only sound good to me now with this tuning.

Once again, big, big thanks to the Audio Store team for being patient & giving great advice for me to make the right decision.

The Science of Sound: Understanding Frequency Response and Impedance (2024)
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