Alpha 1

High-Performance Closed-Back Headphones with 3D Printed Cups

MrSpeakers’ Alpha Dog and Alpha Prime headphones are state of the art upgrades to the classic Fostex T50RP headphone. Both headphones use our ground-breaking 3D printed cups for optimum sonic performance and isolation, without excessive weight.

As closed headphones the Alphas are particularly useful for users requiring isolation from noise, or where an open headphone might disturb others such as traveling, at the office, in a library, etc.

Historically, closed headphones have delivered a small soundstage, often with congestion in the midrange and a sense of “cup” around the ears. With their unique 3D printed double-wall construction and our attention to internal cup tuning, Alphas lead the industry in isolation while offering a sound more closely associated with open-back headphones.

The primary difference between the Alpha Dog and Alpha Prime is that Alpha Prime uses our patent-pending V-Planar technology to increase compliance of the driver. Greater compliance translates to reduced distortion and extended frequency response, for the most open and dynamic sound we could create in a closed headphone. Alpha Prime has also been re-voiced for a more linear presentation through the spectrum.

Both headphones offer very smooth, detailed and dynamic sound that works well across a broad range of musical genres.  We hope that should you choose an Alpha headphone, you’ll enjoy it a lot!

NOTE: The headphone stand is no longer included with Alpha headphones.


MrSpeakers' Alpha Prime headphone is built on the award-winning Alpha Dog 3D printed baffle and cup assembly. But we don't stop there, that's where we started.

Pure and simple, Alpha Prime was about tuning and improving the driver, and changing the voicing to reflect the improvements. And no, we won't say what we've done differently, but it took a LOT of work to do it. And we truly hope you'll enjoy it.

V-PlanarDriver Processing

Simply stated, a conventional planar driver is usually assumed to move as a flat surface.  In reality, this is not possible as the driver substrate is inelastic and  “locked” at the boundaries.   As such, the driver will move more as an arced surface then a flat plane, as conceptually illustrated in Figure 1.

standard-animation320FIGURE 1: Conventional Driver Motion

Over the years, different approaches have been developed to address nonlinear planar motion and the artifacts it can cause.  Fostex patented their RP technology, used on all their drivers used in our headphones, to reduce panel nonlinearities.  Another approach, known as knurling, was patented in 1997 by Bruce Thigpen, founder of Eminent-Technology and pioneer of numerous planar magnetic speaker technologies. We felt it would be possible to improve on the solutions available to date, so we collaborated with Bruce to develop V-Planar knurling technique (we filed for a patent with Bruce as a co-inventor).

In simplified form, V-Planar technology addresses nonlinear driver motion by more deeply creasing the diaphragm to increase compliance.  Much as pleats allow an accordion to expand and contract without stretching the fabric, the creases in the driver "open" slightly during larger excursions as illustrated in Figure 2.  When the driver is processed, the resultant peaks and troughs are deep enough to maintain more of their physical structure even after the driver has been tensioned.

V-Planar-Animation320FIGURE 2: V-Planar Driver Motion

Increasing the driver compliance allows it to behave as a more idealized planar surface and also improves it's acceleration.  With more of the driver surface in linear motion, V-Planar can not only push more air at low frequencies, but with greater acceleration also delivers better dynamics, high-end frequency response, and measurably lower distortion. The Sound Our main goal in producing the Prime was to upgrade the performance of our Alpha Dog headphone to deliver an even more natural and realistic sound.   Primary voicing was done using top-quality acoustic recordings followed by a dose of EDM to ensure the fun and lively performance with material that pushes sub-bass performance. The result is a very smooth, detailed and dynamic sound that works well across a broad range of musical genres.  We hope that you'll enjoy the sound of this headphone.

Alpha Prime vs. Alpha Dog

We know you're going to ask, and here's the answer. It's better. Across the board in our opinions. Faster, more detailed and textured mids, smoother highs, a better balance, and holographic soundstage and imaging, where every sound source is not only in the right place, it occupies the right space.

The Alpha Dog is a great headphone, especially at it's price. Alpha Prime is just a great headphone, and we hope those who decide to buy one will really, really enjoy it.


MrSpeakers is please to announce that upgrades to Alpha Prime are now avaiable.


The Alpha Prime is $999.99 and Alpha Dog headphones are $599.99. Alpha headphones include one cable 6ft. 1/4", 3.5mm single-ended cables or 4-pin XLR, 2.5mm, RSA/ALO balanced cable.

Alpha headphones also come with:

  • One cable
  • Metal stand (while supplies last, this part is discontinued)
  • Cleaning cloth
  • Two year warranty
  • Pinout For Custom Cables

    The Alpha Prime and Alpha Dog use a dual-entry cable attachment. The plug is available to cable manufacturers at, and the part number is SN-8-4(P), and they are available for purchase on our accessories page.

    1 = L+
    2 = L - (or ground for single ended cables)
    3 = open
    4 = open

    1 = R+
    2 = R - (or ground for single ended cables)
    3 = open
    4 = open


    Frequency response (+/- 3dB): 16Hz to 18KHz

    Efficiency: 90dB/mW

    Weight (without cable): 440g

    Cable: Dual entry


    *Carpe Diem!