Harmonicdyne P.D.1. Review – Planar Hybrid Earphones

The Harmonicdyne PD1 with Shanling M3x

This is all getting a bit crazy now, and I love it. The Harmonicdyne PD1 earphones have just been released, and they have a unique driver configuration. They are hybrids, but there are no EST or BA drivers here; these have a planar driver and a dynamic driver. Innovation and experimentation go hand in hand with the Shenzen audio market, and in this review, we are taking a look at, from my perspective, one of the most exciting products of the year so far. Is this an earphone revolution or an experiment gone wrong? Let’s find out.

Harmonicdyne PD1 Pricing and Availability

The Harmonicdyne P.D.1. is available at several locations. We do not state current prices here because they are subject to change. We provide the links below so you can check for yourself. Please view the links below to see up-to-date pricing and availability information.

Harmonicdyne P.D.1. at Linsoul (Global Shipping)

Build Quality and Design – Harmonicdyne PD1

To show PD1 build quality.
Harmonic PD1 with cable and earths removed. The all metal body inspires confidence in the build quality.

The Harmonicdyne PD1 is very well made. It used an entire metal body which will hold up well over time. The design is a bit on the bland side compared to the stunning faceplate resing designs of recent years, but I will still always take metal over acrylic for the simple reason of longevity.

I discuss the earphone cable below in more depth, but they are beautiful, very well made, and happily have an MMCX connector which is my preference over two pin models.

The photos will show you the PD1 aesthetic, but let’s talk a little about the internal design, making this such a compelling product.

The earphone is a hybrid model and has two separate driver technologies inside. There is both a dynamic driver and a planar magnetic driver. This makes for a “best of both worlds scenario” with the planar handling the mid-range and highs while the dynamic driver takes care of the lows. 

Packaging and Accessories – Harmonicdyne PD1

Showing the PD1 package contents
The PD1 come with a wide and high quality range of accessories.

The packaging of the Harmonicdyne PD1 is excellent. A very classy affair with a papyrus-style box with excellent texture and detail. It’s a pleasant unboxing experience and doesn’t contain too many recyclable materials.

Presentation is in the jewelry box style with the top opening upon which you are faced with the earphones and some of the accessories laid out. The good thing here is that Harmonicdyne went all out and includes a comprehensive set of extras to keep you happy.

In the box, you will find the following items:

  • The Hamoricdyne P.D.1. earphones
  • Multiple tip options in various styles and sizes
  • Jack adapter plug
  • 1x 3.5mm headphone cable with MMCX connectors
  • 1x 4.4mm balanced headphone cable with MMCX connectors
  • 1x PU leather branded carry case

The cables are the highlight here. It’s not often that a company will include an extra set, but this one has a purpose. You have the standard 3.5mm cable that will work with most devices. However, Harmonicdyne knows their audience, and the chances are if you are messing around with audiophile earphones, you probably have an external DAP/DAC or Amp unit. These sources now come with balanced options for output and are the favored method of connection by most people in the hobby.

The inclusion of this second cable is a welcome addition and offers an alternative to expensive headphone cables with interchangeable adapters.

The cables themselves are pretty stunning. They are thick and luxurious, the sort of thing I wouldn’t think of thought twice about spending over $100 on just a few years ago. They aren’t the same with a different jack, though, so let’s discuss each in more detail before moving on to how the Harmonicdyne PD1 sound.

The standard 3.5mm cable seems to be pure silver. It’s an eight-strand braid before the splitter moving to a four-strand braid after the splitter. This makes it very compliant, and it flows well while at the same time helping to reduce the possibility of microphonics. 

The jack is, as mentioned, 3.5mm and sits at a relatively unique 45-degree angle and is constructed of metal. The splitter and cable cinch are also metal, and the splitter has the Harmonicdyne logo printed in white. 

Termination at the earphone end is by gold-plated MMCX connectors that sit just after a cable guide to help them loop over the ears. The only other thing of note is the cable tye is a small piece of leather with a brass stud. It looks nice.

The balanced cable has all the same features apart from being terminated in a 4.4mm plug and having a 50% silver and 50% copper construction, meaning that 4 of the strands are silver and 4 are copper. It looks great, and both cables are befitting of a high-end IEM.

Sound Quality – Harmonicdyne PD1

Tested with a range of DAPs, DACs and Amplifiers the Harmonicdyne PD1 performed well in most sound testing.

Ok, so these sound incredible. Very natural with enhanced bass, but what harder to describe is the out of head headphone experience that they produce. I don’t often use that term, but that is what I get from the PD1, a presentation that appears to be taking place outwith your ear canals. 

The detail retrieval is outstanding. It one of the best IEM’s I have heard at this price point. I am a big believer in the planar driver headphones. The imaging is unreal. One of my favorites of recent years was the Tin Hifi P1, and there are many similar characteristics between the two. One criticism (from some, not me) was a lack of sub-bass, and the PD1 doesn’t suffer from that.

Bass is impactful with intense sub-bass when called upon, yet it reverts to a more mid-bass sound when the genre or track requires it. It’s enjoyable and hits extremely hard when needed. Listening to the opening minute of Quick Musical Doodles by Two Feet impressed me with the highs and mids standing clear while at the same time the bass slamming into my eardrums.

The highs are crystal clear, emphasizing and pushing to them that make them sound very open and airy. Snare and cymbals sounded fine with no overextension into the sibilant territory. They are not a dark laid back sound. Its energy and clarity all around with the highs and I would say solid performers in this area.

The mid-range is what I would describe as natural with excellent detail retrieval. Female vocals get the most benefit of the PD1’s; solid performance in the upper mids with a slight bump sees them shine clear and bright. Similarly, this aids with the performance of stringed instruments in the same range. Vanessa Mae’s Storm was a standout track during testing, as was Toque. Male vocals also sound great but not because of the weight more for the detail retrieval that lets you pick up on reverberance and grain when they sing.

The soundstage is vast; it’s an open presentation with equally significant levels of width and depth.

Imaging is powerful. Lots of separation between instruments is combined with the ability to position instrumentation within the tracks quickly.

Who is this the Harmonicdyne PD1 for?

The PD1 is suitable for use for someone who wants to own just one earphone. Still, it is also a great item for collectors who wish to add a planar earphone to their collection because it truly offers something unique you may not find in traditional BA (balanced armature) or hybrid earphones.

The bass response is vital, so they are great if you like to listen to EDM, Pop, and hip hop. Equally so, if you listen to music that requires a large soundstage, such as live concerts or orchestral they would be a good fit.

They are also very well made and have a good set of accessories. I consider them great value for money in terms of being a total package.

Review Conclusion and Final Thoughts

PD1 earbuds with the cable attached.

The PD1 takes a lot of what I liked about the Tin-Hifi P1 and puts a new spin on it with a dynamic driver that provides some deep and delicious sub-bass. The detail retrieval and out the head experience is what stands out most. Still, when we consider the excellent build quality, suitable accessories, and the inclusion of two cables, these are surprisingly good IEM. With its unique driver configuration and technical ability for the sub $400 price point, this is one of the standout models and easy to recommend. 


Audiophile Onhttp://www.audiophileon.com
Audiophile On is a website dedicated to high-end audio products. With over 15 years as a reviewer, all articles are hand-written by one person to allow the comparison of products. Headphones, earphones, speakers, amplifiers, or DAC's we cover here.

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