Drop x JVC HA-FDX1 DD IEM: The second coming of ...

Discussion in 'IEM Measurements' started by purr1n, Aug 10, 2019.

  1. JK47

    JK47 Guest

    @purr1n Could the possible difference in bass be related to what appears to be a port on the housing?

    The small hole behind the nozzle release...
    IMG_2285.jpg
    dUVKtaHQESO4xkabbWeT_1080x1080_MD-88992_01.jpg
    I tried taping over the hole and don't really think it made much of a difference, but then again I don't have the best hearing to pick up subtle nuances.

    I do like the look of the machined edges of the FD01 better.
     
  2. Biodegraded

    Biodegraded Friend

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    @JK47 , FD01 also has that front port.

    Another question for @purr1n : tips remain Spiral Dots, I take it? @fp627 , that might help your question.
     
  3. JK47

    JK47 Guest

    Uhhhhh Yeah, thanks Captain Obvious, that's why I posted pic's of both models. The ports may be of different size or have filtering inside...
     
  4. Biodegraded

    Biodegraded Friend

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    Ah - sorry, didn't pick up you'd shown both models :oops:
     
  5. YMO

    YMO Chief Fun Officer

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    This got to me left field. I'm curious if this will give me a slightly more bass slam than an Andro. In other words, not something that's v-shape but still has some bass fun.
     
  6. gixxerwimp

    gixxerwimp Professional tricycle rider

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    Modded FD01 has looser but slammier bass than Andro, especially with a bit of EQ to boost mid bass.
     
  7. james444

    james444 Mad IEM modding wizard level 99

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    The ports definitely have filtering inside, or else (with ports that size) you'd have no sub-bass @50Hz and below.

    Filters may be different, but only measurements can proof that. Just speculating, but filters with slightly lower acoustic resistance on the FDX1 would result in slightly less (deep) bass amplitude and subjectively more control.

    However, if FRs with stock filters are identical, I'd assume that filters are identical as well.
     
  8. purr1n

    purr1n Desire for betterer is endless.

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    Used the same tips throughout for listening tests. Settled on the medium. Don't know if they are Spiral Dots.
     
  9. purr1n

    purr1n Desire for betterer is endless.

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    Drop x JVC HA-FDX1 Frequency Response
    Comparison of Different Nozzles
    Be aware of filter confusion: https://www.superbestaudiofriends.o...-the-second-coming-of.8169/page-9#post-304495

    WHITE = FDX1 stock
    GREEN = FDX1 green
    BLUE = FDX1 blue
    upload_2019-8-11_10-2-18.png


    Drop x JVC FDX1 vs JVC FD01 Frequency Response
    Stock nozzle

    VIOLET = JVC FD01
    YELLOW = Drop x JVC FDX1
    GREY = CFA Solaris IEM (for comparison)
    upload_2019-8-11_10-4-25.png

    Note that FDX1 lays the bass on thicker than the CFA Solaris.
     
    Last edited: Jun 12, 2020
  10. purr1n

    purr1n Desire for betterer is endless.

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    Harmonic Distortions

    upload_2019-8-11_10-44-57.png

    Note, the 500Hz spike below looks like a measurement artifact or anomaly.
    upload_2019-8-11_10-47-6.png


    In terms of bass, the only thing I can make out is that the Drop FDX1 has lower third-order distortion in the bass. Here is another set of visualizations with the lines smoothed a bit. Given the nature of these measurements, it's too close to call.

    upload_2019-8-11_10-49-18.png

    upload_2019-8-11_10-49-26.png
     
  11. shotgunshane

    shotgunshane Floridian Falcon

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    FDX1 comes with regular spiral dot tips. Best wide bore tips on the market IME.
     
  12. YMO

    YMO Chief Fun Officer

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    Thanks for the info. I'll give it a shot when pre-orders opened up. Some might remember I wanted a v-shape IEM not too long ago. Either something with the design was off or it's just too much money ($499 Polaris V2). If going by the charts that was posted here, I might do the Green over the Blue. Less Treble is always my preference, but not too much.
     
  13. purr1n

    purr1n Desire for betterer is endless.

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    BURST RESPONSE

    Drop HA-FD1X (blue nozzle)
    120Hz Burst
    upload_2019-8-11_11-19-19.png


    JVC FD01 (@zerodeefex nozzle)
    120Hz Burst
    upload_2019-8-11_11-17-34.png
     
  14. james444

    james444 Mad IEM modding wizard level 99

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    Let's not forget, you can also use the white (filterless) FDX1 stock nozzle to add any DIY-filter you want.
     
  15. purr1n

    purr1n Desire for betterer is endless.

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    BURST RESPONSE

    Drop HA-FD1X (blue nozzle)
    500Hz Burst
    upload_2019-8-11_11-21-35.png

    JVC FD01 (@zerodeefex nozzle)
    500Hz Burst
    upload_2019-8-11_11-22-29.png
     
  16. purr1n

    purr1n Desire for betterer is endless.

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    Some thoughts on the bursts responses:

    I saw no differences in the 50Hz 10-cycle burst, so I did not post them. However, I saw significant differences in decay behavior of the 120Hz and 500Hz bursts. 120Hz can be considered mid-bass, but 500Hz is well above the bass region and into the 2nd and 3rd harmonics of what we would consider bass.

    I do wonder if the 120Hz and 500Hz signals (as opposed to lower frequencies) might be more reflective of "bass quality", or specifically, bass control and articulation. If we think about it, there's no such thing as "fast" bass because bass is inherently slow. Perhaps the lack of bass control we are hearing with the JVC HA-FD01 is really the lack of dampened decay from overtones pf the bass region, which are not so slow as bass proper.

    Burst response measurements are still experimental, but I think it would be fair to say that the behavior seen in the decays of the 10-cycle bursts for the 120Hz and 500Hz signals on the JVC HA-FD01 is not typical. I don't want to jump to conclusions because of the lack of data points (we really need more data and better analytics), but maybe this explains what @shotgunshane and I are hearing in terms of "tighter" bass on the Drop HA-FDX1

    Drop x JVC definitely did something here. Looks like the answer is a little bit clearer now to the guys who have asked me on whether the Drop version should be purchased on top of the earlier JVC FD01 purchase.
     
  17. gixxerwimp

    gixxerwimp Professional tricycle rider

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    There are spirals of little concave dimples on the inside of the bore. They're supposed to "massage" the sound as it comes out before it enters your ears.

    [​IMG]
     
  18. penguins

    penguins Friend, formerly known as fp627

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    Thank you Biodegraded. Unfortunately just the fact that it's large/wide bore probably means the phones themselves are already going to be too big.
     
  19. hellwhynot

    hellwhynot Friend

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    They are "Spiral Dot ++". In terms of size and profile, they are identical to the original "Spiral Dot". The biggest difference I can see is the outer material on the ++ is more gummy compared to the original. This makes them feel a little bit more comfortable to me; but also makes them attract dust like you wouldn't believe.

    https://www3.jvckenwood.com/accessory/headphone/earpiece/ep-fx10/

    The ++ is also supposed to have a dual material construction- the core being separate (and color-coded) from the rest. The tips that are on the FDX1 are a single black piece from what I can tell. So I'm not sure if they are an OEM version of the ++, or perhaps the "+" version that came between the original and the ++.

    The bores are definitely on the large side- as the Spiral Dots would tell you. They do give you the traditional five sizes including ML and MS.
     
  20. james444

    james444 Mad IEM modding wizard level 99

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    They look like the "+" version that came together with the FD01 I bought last year. The "+" version is just a tad softer and more gummy on the outside than the original Spiral Dots, but otherwise looks the same to me. Anyway, there's no color coding on the tips I got with my FD01.
     

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