Massdrop Plus

Discussion in 'IEM Measurements - La Cenric's IEM Playhouse' started by La Cenric, Oct 18, 2017.

  1. La Cenric

    La Cenric Friend

    Staff Member Friend IEMW MZR
    Joined:
    Dec 12, 2016
    Likes Received:
    653
    Dislikes Received:
    0
    Trophy Points:
    93
    Location:
    Melbourne, AU
    Home Page:
    Foreword: The Plus is Massdrop's first fully in-house developed IEM, sporting three BA drivers. This sample was kindly provided by @CEE TEE.

    Frequency Response
    FR (CM).png

    Rescaled
    FR (RS).png

    Impulse
    Impulse (L).png Impulse (R).png

    CSD
    CSD (L).png CSD (R).png

    THD
    THD (L).png THD (R).png

    Impedance response
    Impedance.png
    Analysis
    • The 8k resonant peak on the Plus is highly affected by insert depth. It essentially flattens out the closer it is to the reference plane (for reference, most IEMs with the same peak simply have the peak shifted down rather than flattening out). It can be inferred that a deeper insert is optimal for the Plus. (The same characteristics can be seen in Etymotic IEMs)
    • Channel matching is good. No qualms.
    • The Plus follows Etymotic's Diffuse Field tuning but with a 5dBish boost in the bass. In theory, this should make for a more "musical" signature.
    • Being a full BA setup, D3 distortion is expectedly high. In this case, it is slightly higher than the other BA IEMs that I've measured (UERM, Atlantis etc.). D2 distortion is also comparatively higher.
    • Extremely reactive with impedance. Source rolling and matching highly recommended.
    • Incredibly textured and clear notes, too much for my tastes. I'd prefer to smooth it out slightly with higher OI devices, but your mileage may vary.
    • I follow @Hands' opinion of the Plus' timbre; a little thin and almost "crinkly" sounding. Timbre is much better with a better fit, but still leaning more towards thinness in terms of note weight. Great for picking out details, but admittedly not as good for a more "natural" sound a la Andromeda or UE18+.
    • Overall the MD+ is a very technically proficient IEM and works well for reference and critical listening, easily on the level of the ER4 veterans, perhaps higher depending on your uses. A great take on the "slightly fun reference" signature whilst sacrificing none of the performance.
     
    Last edited: Oct 20, 2017
    jowls, FlySweep, kitantisune and 7 others like this.
  2. Vansen

    Vansen Gear Master (retiring)

    Staff Member Friend
    Joined:
    Nov 19, 2016
    Likes Received:
    2,302
    Dislikes Received:
    3
    Trophy Points:
    93
    Location:
    Seattle
    Man, that 8k peak looks very different on this measurement than on measurements I've seen elsewhere. Do you notice the peak when listening to the IEM, or is it a measurement artifact?
     
    Kunlun likes this.
  3. La Cenric

    La Cenric Friend

    Staff Member Friend IEMW MZR
    Joined:
    Dec 12, 2016
    Likes Received:
    653
    Dislikes Received:
    0
    Trophy Points:
    93
    Location:
    Melbourne, AU
    Home Page:
    I wouldn't really call it an artifact but it's very specific to insert depth. To me, the MD+ is certainly bright and my optimal setup is foam tips + probably a higher Zout (tried it with the 20ohm resistor, it was definitely too much but definitely in the right direction.

    I'll just steal Speakerphone's analysis of the effects of insert depth on Etymotics as a primer

    See that the peak doesn't shift, but rather flattens out. I observed about the same characteristic with the MD+. I'll throw up some measurements on the reference plane later today when I'm free.
     
    Last edited: Oct 19, 2017
  4. La Cenric

    La Cenric Friend

    Staff Member Friend IEMW MZR
    Joined:
    Dec 12, 2016
    Likes Received:
    653
    Dislikes Received:
    0
    Trophy Points:
    93
    Location:
    Melbourne, AU
    Home Page:
    Insert depth variation test results:

    Insert depth.png

    Unfortunately the IEC microphone does not let me go beyond the reference plane, so for the next few tests I will be using the trusty IMM-6 with a compensation file.

    Insert depth IMM6.png

    Red line represents the deepest insert out of the three.
     
    FlySweep, Bina and bartzky like this.
  5. La Cenric

    La Cenric Friend

    Staff Member Friend IEMW MZR
    Joined:
    Dec 12, 2016
    Likes Received:
    653
    Dislikes Received:
    0
    Trophy Points:
    93
    Location:
    Melbourne, AU
    Home Page:
    Went through the bag of tips provided with the sample and decided to settle on the black medium silicone tips. Seems like the combination of the stiff hybrid Symbio tips and the large bore of the eartip resulted in quite a bit of pneumatic pressure buildup within my ear canals, which somehow aggravated the "crispy" nature of the timbre as well as accentuating the treble. Opening my jaw, inserting the IEMs then closing seems to work, reducing the sharpness of the sound quite significantly. Not sure what phenomena is going on here; if any audiologists can chime in for a knowledge bomb (or harsh chastising for misinformation) please do.

    Anyway, new impressions are much better. Will edit the first post accordingly.
     
    Aleatorius likes this.
  6. Kattefjaes

    Kattefjaes Mostly Harmless

    Friend
    Joined:
    Sep 5, 2016
    Likes Received:
    5,111
    Dislikes Received:
    41
    Trophy Points:
    113
    Location:
    London, UK
    I've experienced weird pressure differentials (positive or negative) with deep insertion* IEMs. One thing that seemed to help me was pulling down gently on the earlobe to make a bit of an airgap while inserting them. Once they're seated you can let go, then you usually get a decent and fairly comfortable seal.


    *settle down
     
    Last edited: Oct 20, 2017
  7. zhouharvey

    zhouharvey PayPal’s $2 Sensible Enforcer

    Executed
    Joined:
    Feb 19, 2016
    Likes Received:
    19
    Dislikes Received:
    57
    Trophy Points:
    18
    I wished they could sell it for 199.99, just like the HD6xx, but I know it won't happen...
     

Share This Page