Verum Audio - Exciting high performance DIY planar

Discussion in 'Headphone Measurements' started by cskippy, May 24, 2018.

  1. gixxerwimp

    gixxerwimp Professional tricycle rider

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    It's a Verum 1 v1 with rabbit-ear headband. Third/fourth hand to me, so I have no idea which batch.

    OK, I just "shocked" the R driver with some really loud Tay-Tay and the impedance dropped to around 11Ω, with required balance compensation going down to 4dB.

    So either it's the diaphragm and my application of DeoxIT was a coincidence, or there's something weird going on in the connector.
     
  2. gixxerwimp

    gixxerwimp Professional tricycle rider

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    Update to my channel imbalance problem. Turns out it was kind of self-inflicted* ...

    The Dekoni pads came in and I preferred the Hybrids over the Sheepskin, latter sounding a bit too forward in the upper mids, though both had a bit of midrange suck compared to the stock non-perforated pads. (The Dekonis don't suck in this particular application.) The slant on the pads brings the 2D stage a bit more to the front and pushes the center image out slightly. They're a bit thinner than the stock pads and my ears just touch the "panty hose", so I cut donuts from 2mm craft foam and inserted them between the pads and hose.

    After I did the final pad swap and settled down for a proper listen, volume in the R channel suddenly went way down and measured 30-40Ω, and fluctuated with more "shocking", going up as high as 400Ω. It settled in the 20s and I let them run overnight. Tried some more deoxIT, no effect. I shocked them a bit more with some fluctuation in impedance, but only getting down to the 20s. Usable with -10dB on the L channel, but I figured I'd go for 1 more shock ... Well, I finally got my catastrophic failure. No sound and it measured 2-4kΩ. More shocks had no effect.

    After consultation with Dr. Playnar, I prepped for exploratory surgery to see if it was the driver or connector. Clips in place, I started removing the screws securing the front baffle, but I noticed a couple were already loose (ones that had the nuts swapped for female standoffs to hold the modified grills - *they likely backed out when I previously opened the grills). Figured WTH, tightened them up and measured one more time ... 10Ω! ... and sound! :headbang:

    So I played around with tightening and loosening all the screws and at one point with all screws loose it was 7Ω, same as the L channel. After several more rounds of tightening/loosening, the impedance of the R channel settled at 6.5Ω, requiring 1dB of balance correction in the other direction when driven with the LC (shouldn't be necessary with SW51's higher Z output). My best guess is that the slightly loose baffle resulted in something pressing or pulling on one of the leads, causing an increase the impedance. So glad I didn't have to open them up!
     
  3. Suppa92

    Suppa92 Rando

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    just received my verum 1 mk2s today & tried it with JDS Labs Atom+ stack.
    I don't know whether Atom+ stack provides less current to headphones or something else, to me it sounds extremely close to my BLON-BL03s.
     
  4. Niconinho74

    Niconinho74 Rando

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    Hello, I just subscribed to post my two cents. I work for an important distributor of hifi equipment (both mid and high-end) since many years, music and hifi are my hobbies and I had the opportunity to borrow and test many products since my young adult age. Well now I have a Verum since this summer and feeling its potential I never stopped to look for the better combination on a possibly low budget. I won’t repeat impressions of these headphones here, other forumers described well the sound of Verums. The only thing that frustrates me most with poor matching equipment is the lack of details (like tiny reverberations that give the sense of atmosphere of a song). I had a Sen HD600 for some years before and I also miss sometimes its silky treble. I listen mostly to classical and jazz (it’s a shortcut and don’t mean to sound stereotype).

    Regarding the matching of components, among others I tried (and modded a bit) a Monoprice amp featuring the TDA6120A2 amp chip with integrated Burr Brown dac (with output resistor lowered to almost zero to better match the Verum ‘s impedance, checking there was no oscillation of course). The sound was impressive at first, very dynamic, almost brutal, clear and open and detailled, but after a while realized that it was quite wrong tonally, the timbre critera being the most important to me, lacking texture and fullness especially in the midrange and making voices sound always thinned out even sometimes ear-piercing in the high-mids. I guess the very fast ADSL derived (cheap) chips have this kind of bright sound, maybe LME49600 in the Atom sound similar and I understand why it can be popular among uncareful listeners. In consequence it didn’t last long.

    After a few other trials and errors (a bit disapointed with rHead from Arcam, a brand I know well :) ...) the game is coming to an end with a Schiit Magni 3+ (chosen because no OPA inside not to introduce any supplementary coloration, indeed this amp seems VERY neutral) and a Dacmagic 100 lightly modded. IMO the results are the best two worlds, nice texture and realism brought by the dac (Wolfson 8742, much better than all the Sabre I have experienced, excepted maybe the dac/amp chip ES9219C in my Shanling UA1 Pro which is quite pleasant and not too metallic, by the way quite a good match for a casual listening with Verum) while the dynamics and details are safely retained by the Magni 3+, which even trying nitpicking it’s really hard to say that if it verges on the bright or warm side, since it seems exceptionnally resepectul to the source.

    For my tastes I noticed I much prefer an amp with a theoritically shortage of current capability but tonally right than a current monster with flawed tone, so you may not need to be too focused on the power when choosing components.
     
    Last edited: Nov 30, 2021
  5. Nash

    Nash Acquaintance

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    I got a Verum V1 with old headband design recently and sound drops on the right side constantly. Tapping it a couple of times makes it okay but after a couple of minutes it plays only on the left channel. Any fix for this?
     
  6. Walderstorn

    Walderstorn Friend

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    What do you mean "sound drops", cuts completely or lowers the volume or something? Maybe i am mistaken but i think @dBel84 fixed one of those, maybe he can help in some capacity?!
     
  7. Nash

    Nash Acquaintance

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    Yes it gets cuts off completely, I’ve removed the back grill to check if the diaphragm gets stuck to magnet, but it’s not the case. Also checked the wiring from the jack to the diaphragm it also looks fine. Don’t know what’s causing the issue.
     
  8. Jerry

    Jerry Friend

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    It's a commom issue, but the severity varies. I have tried quite a few Verums; all of them have this cut-off issue. But usually it's quick to recover so all the owners just kinda sticked with it. My first unit came with the right channel out too. I think it could be that cable connector. Mk2 improved when changed from 2.5mm to 3.5mm. But Im not sure.
     
    Last edited: Jun 4, 2022
  9. Nash

    Nash Acquaintance

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    Thanks to @Dzerh was able to fix the issue. Seems the cable connecting the jack to diaphragm was getting pressed in the baffle. Added a couple of small pieces of double sided tape to give the cable some space and it is solved!
     

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