Stax SR-003 MkII Electrostatic IEM

(2 customer reviews)

$ 270.00

Stax SR-003 MkII In-Ear-Monitor

Stax Electrostatic Headphones are legendary, the world’s best in the high performance headphone category. Stax can make that claim because they invented the world’s first electrostatic headphone in 1960. Their flagship SR-009S sells for $4325 and is acclaimed by audio journalists worldwide as the best of the best. 

Portable in-ear electrostatic monitors are now available from Stax, the first name in electrostatic headphones. If you’ve dreamed about owning electrostatic headphones, this is a way to start.

Choose An Amp / Energizer



  • Type:Push-Pull electrostatic circular sound element, In-The-Ear canal type enclosure
  • Frequency Response: 20-20 kHz (4dB)
  • Capacitance: 44pF (including cable)
  • Sensitivity: 110dB / 100V r.m.s. 1 kHz
  • Bias Voltage: 550-580V DC
  • Ear Pads: Silicone earbuds (Small, Medium, or Large) Medium included
  • Cable: parallel 6-core, 1.5m full-length
  • Weight: 0.4 oz without cable / 1 oz with cable




Additional information

Weight 2 lbs
Dimensions 9 × 10 × 6 in

2 reviews for Stax SR-003 MkII Electrostatic IEM

  1. Sound Obsessive, Oct 2012

    The SR-003 have extreme instrument separation and clarity, and are one of the fastest Stax headphones thanks to the very thin diaphragm. Electrostatic headphones have the highest resolution capabilities compared to dynamic headphones and orthodynamics. Artifacts in a digital file can be spotted by the SR-003 and made distinct like under a magnifying glass.
    The treble area is slightly subdued around 8-10 kHz and linear past that region. The “human” translation for this, generally, is that sibilance is attenuated, as well as metallic details and cymbals energy. The dip is not excessive, especially without the headband, but gets more significant with the headband: the sound, while being in both case warm and with upfront, beautiful vocals, tends to lusher, fuller. Sound Obsessive, Oct 2012

  2. Headfonia, 2009

    Like all Electrostatics, the Baby Stax shines in presenting a natural and open sound that makes you forget that they come from a set of IEMs. I think this is the biggest factor that draws me in to the Baby Stax, as all the other IEMs fail to present a natural and open feeling given by the Stax. If I have to pick an IEM that sound closest to the Baby Stax, it would be the Westone UM3X. Both have a fairly neutral frequency curve, with a good body and slightly warm tonality. Although the UM3X have better treble and bass extension than the Stax, I am won over by the Stax’s spacious and open presentation. Being used to full size headphones, I can never listen to the UM3X for too long, as I always feel that the music is restrained to a small box. The Baby Stax, on the other hand, plays the music in a big open space, and everything sounds much more alive and natural sounding in your brain. Not only is the music played on a much bigger space, each instruments are more distinguishable, possessing a much more distinct position in the soundstage. Headfonia 2009

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