Massdrop Plus Universal IEMssearch
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Massdrop Plus Universal IEMs

Massdrop Plus Universal IEMs

(112 reviews)
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Massdrop Tuning, Custom Universal Fit

The first in-ear monitor tuned by Massdrop from the ground up, the Plus features a novel sound signature that combines aspects of a number of community-favorite IEMs. With three Sonion balanced-armature drivers per ear, it delivers extended bass, clarity, and a sound that leans toward full and fun. And while it’s a universal IEM with removable ear tips, the Plus is the next best thing to a custom fit. That’s because it’s based on custom designs worn by musicians on stage for more than 20 years, and the shape is derived from the average of thousands of custom shells. The dampers, crossovers, and tubing were carefully selected after a year of R&D. Finally, every part of the process—from development and 3D printing to assembly and QC—was done in the USA.

Note: This item is in stock and will ship within 1 business day with standard shipping. Expedited shipping in the contiguous US is available at checkout. Your payment method will be charged 2 hours after joining. Cancellations are accepted until that time. The drop will launch and end each day to collect purchases. At checkout, you’ll have the option to add a 2.5mm TRRS balanced cable (+ $30). 

Massdrop Plus Universal IEMs
Massdrop Plus Universal IEMs
Massdrop Plus Universal IEMs
Massdrop Plus Universal IEMs

Reference Sound, Plus Elevated Bass

With the Plus, our goal was to capture the technicalities of a professional audio monitor while adding the sub-bass that many music lovers appreciate—an element often lacking in monitors of this type. The final tuning resembles a reference monitor, plus elevated bass that extends flat and low from 100 Hz down to 10 Hz. The sound is big, layered, and impactful, with the vented bass drivers allowing more airflow and a lower extension than the typical IEM. This produces a rumble and movement of air when the bass is called for, and may even cause the Plus to sound like a hybrid IEM, though all drivers are balanced armature. There’s a plateau in the upper mids for balance and clarity, with a slight dip in the sibilance region and enough treble air to create a sense of openness.

Each pair is handmade with QC measurements, such as frequency response, occurring at multiple points in the process to ensure replication of the target sound.

Massdrop Plus Universal IEMs
Massdrop Plus Universal IEMs


“There’s honest-to-goodness rumble with these little monsters. They are—for lack of a better phrase—fun as hell when you’re listening to Kendrick Lamar or Four Tet. Yet all the while I never felt myself wanting more midrange presence or clarity. Somehow the Plus retains a reference tuning throughout all my test tracks and comparisons. Oh, and they’re extraordinarily comfortable.” - MuppetFace on Head-Fi

"I've been listing to these next to CA Andromeda, CA Orion, JH13 original, and the AAW W900 extensively over the past few weeks. My take on the Plus is that it's the best thing you can get under $1K." - Vansen on SBAF

"Frankly, it’s pretty amazing. Clarity is through-the-roof fantastic! It makes just about everything else at my disposal sound like there are differing degrees/layers of veil yet to be removed. However, the Plus stays harshness and hardness free...The shell shape is form fitting and flat to the ear...I really do love the fit of the Plus." - shotgunshane on SBAF

Massdrop Plus Universal IEMs


FR Andromeda
THD Andromeda


  • 3D-printed acrylic housing
  • Exclusive midnight-blue colorway
  • 3 balanced-armature drivers per ear in 2-way configuration
  • 2 vented drivers for lows, 1 driver for mids/highs
  • Multiple passive crossover points
  • Multi-bore sound channels
  • Input sensitivity: 109 dB at 1 kHz, 1 mW
  • Frequency response: 5 Hz–18 kHz
  • Noise isolation: -26 dB of ambient stage noise
  • Impedance: 10 ohms at 1 kHz
  • ⅛ in (3.5 mm) headphone jack
  • Included cable: 48 in (123 cm) braided silver-coated copper cable
  • Optional cable (+ $30 at checkout): 48 in (123 cm) 2.5mm TRRS balanced cable
  • Made in the USA


  • 3 pairs of silicone single-flange ear tips (S, M, L)
  • 3 pairs of silicone dual-flange ear tips (S, M, L)
  • 3 pairs of foam ear tips (S, M, L)
  • Cleaning tool
  • Hardshell carrying case
  • 1-year warranty


All orders will be shipped by Massdrop.

Estimated ship date is Mar 26, 2019 PT.

Your payment method will be charged 2 hours after purchase. Cancellations are accepted until that time, after which the request will be submitted to vendors to deliver the best delivery time to members, making all sales final. Be sure to check the discussion page for updates.