Review : BGVP DM7 – Higher up



For the nit-pickers and nerdy ones here, I’m giving the specs and technical sheets . For all the other, you can just go to the next page to see how the DM7 performs.

Balanced Armature drivers

The BGVP DM7 is a multi-drivers IEM, a six driver IEM more specifically. When the DM6 were entirely relying on Knowles drivers, the DM7 combines Knowles and Sonion drivers for the best performance.

The IEM is quite unorthodox with a 4-Way Crossover / 4-bore systems. Each channel carries a part of the frequency range to give a smoother curve : low, medium, high and very high. BGVP inaugurates an all-new setup with Knowles filters (x3) and a patented acoustic damper which should offer the best layering.


The drivers used are :

– x2 Knowles SWFK-31376
– x1 Knowles ED-29689
– x2 Sonion 33AP007
– x1 Knowles CI-22955

The Knowles drivers share the lower and upper range, where the Sonion is dedicated to the mid range. The Knowles CI-22955 is definitively bigger than the others, but that was to be expected since bass requires more power and space than mids and highs.

The technical sheets are available on Knowles’ and Sonion’s website but that’s only half of the truth. We saw many great tweeters with amazing design awfully tuned on disastrous IEMs… Let’s hope that’s not the case here, but from what we saw previously, BGVP never failed us… for now !

3D Printed shell

It’s becoming the norm : 3D Printed Shells. Thanks to science, 3D printing is becoming more and more popular and affordable. To make things even better, the precision now equals hand-built shell, allowing batch production of IEMs or CIEMs.

To produce their DM7, BGVP uses EnvisionTEC 3D printing equipment. The German company had been working for major brand like General Electric’s, Phonak, Siemens or even Cartier to offer high-end solutions.

The good news is how cost-effective it can get compared to traditional human-made ear molds. Sure, there is still a lot of work behind to make the earphone sound good, but that leaves more time and energy allocated to acoustic tuning.

BGVP states that the left and right channel error is within 1dB, which is somehow similar to a man-made error margin.

Full specs

  • Type : IEM
  • Style : Balanced drivers x6
  • Crossover : 4 way
  • Drivers : knowles drivers + Sonion driver
  • Socket : MMCX (detachable cables)
  • Cable : 6N 8 core 400 wire OCC + Silver (straight plug)
  • Shell : 3D printed acrylic
  • Frequency response Range : 10Hz – 40kHz
  • Sensitivity : 115dB SPL/mW
  • Impedance : 13.5 ohms
  • Price : 299$

The review continues on Page Four, after the break. Click HERE or use the jumps below


A nerdy guy with a passion for audio and gadgets, he likes to combine his DAC and his swiss knife. Even after more than 10 years of experience, Nanotechnos still collects all gear he gets, even his first MPMAN MP3 player. He likes spreadsheets, technical specs and all this amazing(ly boring) numbers. But most of all, he loves music: electro, classical, dubstep, Debussy : the daily playlist.


    • Reply May 20, 2019

      Howard Olsen

      This is a really great review and I’m grateful for the time and detail you put into it. I thought I’d float a question in hopes that you would respond. Of course “Which is better” questions are highly subjective but it seems our musical preferences seem to be similar. I’ve got a pair of SE535s that I have generally been happy with and have been contemplating and “upgrade” to the 835s, but then come along these DM7s. In my research I find several comparisons between the 835s and the Etymotic ER4XR …. so now I have decided I’m going to get a new set of IEMs and convert my 535s to BT …… If you could only have 1 IEM and your choice was the ER4XR, DM7 or SE835 which would it be? I think we’ve reached the place where price can no longer be considered an indicator of SQ (at least in this $300 to $800 range). Thanks

    • Reply June 2, 2019

      Joenel Salvador

      Using the DM7 for a few days now. I love it more than the Andromedas.

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