In the Input drop-down selector, select the first channel. This is to ensure that REW has the latest set of channels in the ASIO4ALL driver. Quit REW and start it again.
The HarmonicDyne P.D.1 comes with several ear tip options, but they are all silicone tips. In reality, if you have the option of loading a calibration file into your software and you can borrow a measurement mic with a known. Behringer ECM8000 Microphone , the CrossSPectrum Calibrated one at 80. Click on Yes and locate the file.For REW, simply purchase a mic with a calibration file e.g.
I found the Type A tip flange just as easy to fit into the ear canal as it was to have folds in the middle, which can disrupt the seal. This means the Type A tips are more universal in that regard, but if the Type B tips fit you, they will likely do the job better. The Type A tips are softer, so they can be more conducive to going in at a weirder angle if need be.
A software license for one of the DSP packages is required for the service. Mdat file or impulse files from any one of the state-of-the-art DSP software packages along with your room dimensions for a quote. Passive isolation could be better, and perhaps this is where foam tips will benefit you further.For stereo calibration, send us your REW. The use of four vents adds to this, which does not interrupt the seal much but provides for ears that don't get too hot either. The design of the P.D.1 is also fairly comfortable owing to the ergonomic design and average size, and the 6.5 g mass per ear bud without the cable also helps with longer sessions. I suspect a nice set of Comply foam tips would prove handy with these if foam tips work well for you.
For those more curious about planar magnets in IEMs, refer to my review of the Audeze Euclid.Driving these won't take much power since these have a rated total impedance of just 16 Ω kHz. This is quite intriguing and left me wanting to know more. Then there is a crossover to a 10 mm planar magnetic driver associated with a high magnetic flux magnet system for the mids and highs. Instead, the P.D.1 uses a 10 mm custom dynamic driver with a diamond-like carbon (DLC) diaphragm with a carbon nanotube coating on the edges to handle the bass and upper mids, I'd imagine.
I also generally prefer instrumental music over vocals, with favored genres including jazz and classical music.Our reproducible testing methodology begins with a calibrated IEC711 audio coupler/artificial ear that ear buds can feed into enough for decent isolation similar to real ears. HarmonicDyne also rates the frequency response to be 10 Hz–40 kHz, but good luck making use of that!Frequency Measurement and ListeningI will mention that I have a general preference for a warm neutral signature emphasizing a slightly elevated bass and smooth treble range with detailed mids and good tonal separation. If not on the go, space is less of an issue, but the cable length at 1.4 m might be a potential handicap if connecting to a PC as the audio source. This means the P.D.1 will benefit from an amplifier, and a portable DAC/amp or even dedicated DAP might be nice to have on the go, especially with the lack of a 3.5 mm jack on most phones today. Speaking of units, people may look at the 110 dB/Vrms sensitivity and expect the P.D.1 to be highly sensitive, but it in fact works out to 92 dB/mW, which is slightly under average for IEM sensitivity.
Also, the default tuning was used for testing, and no app-based settings were chosen unless specifically mentioned. Octave smoothing is at the 1/6th setting, which nets a good balance of detail and noise not being identified as useful data. I begin with an impulse measurement to test for signal fidelity, calibrate the sound card and channel output, account for floor noise, and finally test the frequency response of each channel separately.
The raw dB numbers are also quite contingent on the set volume, gain levels, and sensitivity of the system. The raw data is then exported from REW and plotted in OriginPro for easier comparison.The IEC711 is such that you can't really compare these results with most other test setups, especially those using a head and torso simulator (HATS). For IEMs, I am also using the ear mold that fits to the audio coupler for a separate test to compare how the IEMs fare when installed in a pinna geometry and not just the audio coupler by itself.
" We wanted to present a sound that was both accurate, and musical yet natural, HarmonicDyne has uniquely tuned the P.D.1 to provide a soothing experience with good sparkle and energy. But before we get there, I will also mention that there was no discernible break-in period or effect, so there is overall good reproducibility and consistency since the average response for each channel is basically the same across the three repeated tests. This is of course considering that the IEC711 isn't all that reliable at higher frequencies, but the difference between the two channels can't remotely be called an issue compared to the actual one. There is a weird dip past 1 kHz in the right channel, which is not a measurement artifact, and then things once again are consistent before the roll off the cliff in the highs. I did my best to ensure an identical fit for both inside the IEC711 orifice, so note how the two channels are pretty much spot on most of the way through the bass and mids. The left earbud was separately tested from the right one, and colored differently for contrast.
We then get to a relatively smooth transition into the upper mids to where things things are still quite good. Mid-bass hits equally hard, especially with EDM, but bass guitar notes in funk and soul music do get hurt somewhat. There's a clearly elevated response going down from ~200 Hz itself, and it continues upward to allow for rumbling sub-bass with detail retention. Let's dissect things further, shall we? The 10 mm dynamic driver indeed caters to the lows with a pretty good bass response for those preferring it. I am not going to mince words here—the HarmonicDyne P.D.1 has overall poor tuning.
I don't know what is going on at that 1–2 kHz rise, but it gets really bright and shouty there, so much so that you will go from a veil draped over vocals and some instruments to suddenly energetic responses for female vocals and a loss in clarity. The further you go past ~1 kHz, the stronger this blanketing effect gets. A significant veil is added over what could be recessed tones in some segments, but accurate and and neutral it is not. If you have seen other IEMs described as "colored" in the sound signature and were not sure what it meant, listening to these will clarify it. But I suspect a combination of the micro-planar driver and tuning is to blame here. But "full-bodied" is certainly not what I would describe the vocals as here, and instrumental mixes unfortunately get muddy and hazy to where imaging is also fairly poor.There is decent range in this otherwise U-shaped signature to theoretically allow the mids to shine.
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There's really no extension in the highs, which made me laugh when I read of a well-extended treble frequency response in the quote above. The inner ear resonance compensation also gets fatiguing before things roll off a cliff in more ways than one. I am not an audio engineer and won't pretend to know how to set micro-planars up for a neutral response, but this is clearly not the way to do it.
HarmonicDyne needs to get an EQ profile out as soon as possible, with some effort capable of improving your listening experience a good amount before scaling becomes an issue. You can indeed close your eyes and imagine being in a recording room with instruments playing, it's just that those instruments don't get dealt the justice they deserve here, and the lack of good imaging hurts further.
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