Verum Audio - Exciting high performance DIY planar

Thanks bilboda and ReAlien.

Before jump into the Verum KS. I did some research on amp pairing because I had a high ohms amp.

I remember read some comments said planar have a flat impedance response which will not affected by the 8x impedance rule.
And this Verum thread post #96 Garuspik also said that Verum has almost zero inductance and capacity so high Zout of amp won't affect frequency response.

Impedance mismatch is it really the reason of my problem? If yes, I don't know why Garuspik reply my email said "have no idea". Which means he don't think high impedance is the key of my problem. He just suggested me press with high force on the magnets ends. I did that but not help.

I guess (just guess, I have no knowledge on this), he think the high volume may generate a magnetic force (or a physical vibration?) which push the magnets misplace, this will change the regular magnetic field to cause my problem.

Anyway, still thanks alot for the advice (but I did try the gentle but firm hit). Or Garuspik can you give a little more clear picture about the amp mismatch?

 

Garuspik knows way more about this then I do. I do recall reading that too, now that you mention it.

I remember slapping tv's at various strength's to get them back on track. One kind of slap wouldn't do it but another kind would. I get pretty good at gauging it and was a one slap wonder. I can't explain why this worked for me. I was thinking of slapping myself upside my head for stupidity when the light bulb went off and I slapped the headphone instead.
Hallelujah!...live Leonard Cohen concert flac is so much more open, revealing more ambiance and space
Wear them while doing it so you know you won't slap them too hard (unless you're into that sort of thing)
Open palm, full width of the can.

I am only repeating this because this did work for me when my left side when silent due to too much volume. (Do not plug them in with music playing, turn that volume down first)

 

Or uses a really really cheap off the shelf OPA1612 amp circuit like many Chinese amps.. the outrage is working though since even they are transitioning away to better stuff.

 

When I ocassionally said that solid state amp that has 20 ohms of output impedance is a garbage I've received my first dislike
Anyway, we've confirmed with @Artyouth that headphones is working and i really doubt it's so easy to tear that membrane with high volume or overheat it.
For me,as a person who was a DIYer literally yesterday main goal is to deliver everything was what promised in working order and in timely manner.

 

Thanks again bilboda and purr1n.
I don't know Amir who purr1n mentioned, but sounds like he is a Topping products pusher?

I feel sorry for my Topping amp... but it did good job on every of my other cans. Include a owned Aeon which also have very low impedance but no such problem as Verum.

Yes fair enough because I pair the Verum with a garbage amp with 10ohms output and 20 if balanced. And I confirm that I received a Verum which is "working".

However I really don't understand why Garuspik keep reply me "have no idea" even on this thread #796. But actually he has a CLEAR IDEA the problem was caused by my amp's output impedance.

My Verum also have a serious twisted yoke on one side. In the email I said accept this because it's not affect the wearing. But now I'm worry because its next owner may not accept this.

 

When I say I have no idea - i really have no idea. I can make any assumptions, but I don't have exact knowledge how to fix that situation. When I'm not 100% sure in something - i always tell people that I have no idea.

If you have unit with any defect - please pm me photos and we'll solve the problem. Either i'll explain how to fix this (headband made from spring steel and you can bend it by hand a little) or will ship you a replacement part.

 

I wondered about your dislike of Amir earlier, now I see at least some reasons for such attitude. I checked Amir's thread about DX7s and he really does not mention output impedance in his post. On the second page of that thread, however, he responds to question about it: "Bad news is that the output impedance is the same as DX7 at 10 ohms." And he cites this info in his output impedance graph used in other reviews (like with THX). Nevertheless, it is indeed strange that he does not mention it in his main post, especially the fact that with balanced it is an outrageous 20 Ohm.

 

I'm confuse.
You stated that SS amp has 20 ohms is a garbage. That's exactly what my amp in balanced is. But you have no idea the cause of my problem.......

Anyway I will stop here. I don't want people feel that I'm trying to push you. I'm just expressing my curiosity.


And I would like to show my yoke problem here. Because your instruction to fix will help the other owners who may have the same problem.

This is the Left yoke. Perfectly stay horizontally.


Right yoke, twisted and slant to one side.


I can shift the slant to other side. But never stay horizontal. (please also note the grill popup)


Top view.

 

@Artyouth i see, I’ll ship you a replacement. You’ll need to unscrew two small nuts and replace half of headband.
But fixing this takes 1 minute - disassemble headband and straighten yokes by your hands.

 

I'm definitely prefer a fix if it's easy and no risk.
I mod most of my cans so I think I can do this. Please kindly show me the instruction. Thank you.

 

Please don't take the dislike personally. You'd have to be here a bit longer to come to know that there are some people that we have discussed to death and prefer to now leave to their own madness, unaided by links, or even encouraging people to google, from this site.

It's a matter of hygiene.

Being a proper English person is slightly better than being dead!

 

purr1n thanks again your further explanation. Even I'm still not know the formula but can understand the water.

And before your further explanation I've already sure the problem was caused by my amp high impedance (Thanks the members here).

This is a inadequacies of my amp I fully accept the truth. However if this amp works well with all my other cans (as I said before include the Aeon which is 13ohms), I will say it's not a garbage, it's fine, for me at least.

If we call a high ohms SS amp that is a bad design, to be fair we also should say a headphone with such this low ohms is a bad design.
Verum not works well with some amp but excellent with others, my DX7 not works well with Verum but fine with others.

Yes I asked and got answer. However I kept asking was not because I DON'T LIKE the answer. Is because the answer objectively unreasonable.

 

@Garuspik was pretty clear with the amplifier impedance requirement from the get go. And if you don't understand basic headphone damping requirements, typically 1/8 rule then don't go into boutique headphones. Bose and Sony are waiting for you.
I believe there's a limit to the customer is right. The mature thing to do is to admit you didn't do your research and you now understand where you went wrong.

 

I have nothing to say, just want people don't get me wrong I'm not a hater, or a fans. I follow his DIY post years ago and my backing number was 10.

 

Nothing unreasonable about it really. In simplest terms, ignoring the math. Sounds like your amp is just not stable at that load. Think about it in terms of speakers and amps. You buy an amp that is only stable at 8ohms and then try and run speakers that are 4ohm nominal, you might be okay but the symptoms you describe are what I would expect to happen when you are not okay. Not a design flaw. Lots of speakers and amps don’t work well together so if it’s a flaw then there is a ton of equipment out there, low and high end, that would also be flawed...and they’re not, just different approaches. A few here already said it, not enough current.