šŸ”· Neumann NDH20

Yep I actually took off the hd600 headband pad and got some nuggets. The hd600 headband pad over time actually didn’t solve the comfort issue I was having.

Holy crap, these nuggets are a game changer. Wore them for 6 hours today, didn’t feel anything (whereas I can feel a certain spot going bald after 2 hours normally).

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anyone try earpad swapping on this thing?

At least Z thinks swapping destroys the whole sound e.g. also bass. I am curious if someone ever tried but to me these sound perfect. The head likes to hurt every few days.

Have you ever found a wire for this eventually?

Bought the NDH 20 from a guy on headfi (he’s in Washington), shipped it 7/29… It got to Croatia last week and is held up on customs, this is ridiculous. I know it’s COVID and all but goddamn.

Somehow I never learn not to order anything from the US.

You’re not having to wait much longer than us in the US receiving shipments from within the US, honestly. I’ve had several things take 2+ weeks to be shipped from only a few hundred miles away lately.

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Poor USPS… Seriously. Hope you (and all your ballots) survive November…

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DONT BUY the HartAudio Cables. THESE don’t fit at all. I am currently fighting with the fact ā€œI should push as hard as possibleā€ because it is a tight fit. (Insert swear word) insulting my German standard. I hope I get help from 1 redditor who also owns a cable from them for the NDH. BTW if anyone also has a hart ndh cable please describe the fit.

So you are just gonna put hart on blast without fully understanding if you even picked the right cable or using it properly? Have you contacted hart?

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Can you post a picture of the connector that goes into the headphone?

I am very sad about the fact the connector is so stiff I can only get 2 pins of length into the NDH20 with shorting out the pins. It is a push-click-and-turn-90° connection system. The original connector / cable is much looser from Neumann / Sennheiser.
Just be aware that forcing a plug into a headphone is not a sign of quality. Making adjustments by myself is not right too for paying more.

Just thinking out loud:
If I have not use for the cable, which will change probably with Sony CD900ST or M1ST, I seem to be able to get the money back from the CEO of the HartAudio. Instead of it, just to be transparent, I will just get an other cable end which is btw 1.3 meters with 3.5mm or an different connector, not sure which headphone I’ll order.
The cable quality is a C+, hand-made, copper cables inside the sleeve are feelable and even Logitech USB cables are more solid and still extremely flexable.

edit: pictures 2 and 3 mean I was not sure how precise I can be without adding extensions like a ruler.


This is an other person who has the same issue but did force it. I do not. It is against my German standards. Other cables can be different. It is a 3D printed design if my guess is right and sand it down / cut marks are visible. The cable itself is good, the NDH connector which is not manufactured by other companies (others are bigger so sanding it down is needed, I think Audio Technica do use that turn mechanism too)

I directly talked to customer support so they chose the right cables through 3 emails comfirming my setup. They also said they like a tight fit AFTER I got the NDH 20 - 1.3meter to mini xlr + extention 2 meters + mini xlr to 3.5mm for audio device. A tight fit that needs the cable to forced in harder than my hands can cause I slip off the metal part of the cable is Wrong. This is officially out of spec by choice :-/ .

Support screenshots won’t be posted it you want but I need to censor the standard parts and I would violate the privacy too much imo.

@brux You are probably aware of this, pinging you anyway.

Ohh thanks for tagging me, yes aware of @KingForKings issues. I last sent him an email on Friday afternoon I believe. I’m disappointed that this type of thing has been posted publicly (I think I’ve said before this type of stuff is a constant source of anxiety >_< haha. But it had to happen some day!). There are a few misconceptions that hopefully I can help clear up:

  • I am not a CEO. I think there may be a misunderstanding about the size of our operation here, but this is a very small business. There is a handful of us, and we do our best to take care of the customer to the best of our ability, which hopefully has been evident with your correspondence with us so far @KingForKings . Though with what you’ve posted here I’d imagine not, which is on us. So sorry about that.

  • Sennheiser (who owns Neumann these days) is notorious for using propriety connectors in an effort to prevent third party cables (like the ones we make at Hart) from being used with their headphones. In the case of the NDH20s, they accomplished this by reducing the size of a standard locking 2.5mm connector that you’d find on things like M50x, or their previous headphones like the Momentums etc. Unfortunately sourcing the correctly sized, molded connector in the exact size that they’re using on the NDH20s is very difficult (i.e. I have not found a good source for those as of yet). So what we do here, is we take a normal locking 2.5mm connector, and use a belt sander to carefully shave the molded section of the connector down to the same size of the Neumann stock connector or slightly less. From there we test every cable we make on my own personal pair of NDH20s and make sure they go through our standard testing process before going out the door.

  • I think you mentioned somewhere that I was saying you should just jam the connector in. And I’d like to be clear that that is NOT what I’m saying. I said that it is indeed a tight fit, I understood your reluctance to not want to force the connector in, I was confident that if the supplementary guidance we provided previously was followed it would work, and that I did not think us making a replacement was going to solve the issue (taking into consideration that it’s an international order, and the likelihood that you’d feel you had the same issue with the next cable we’d send you anyway), and that we’d process a refund if we could not satisfy you as a customer (which has been initiated). Here is that correspondence:

  • And here are the aforementioned instructions, sent by my employee that helps respond to customer emails / custom shop requests:




  • All this being said, we very well could have screwed up and due to tolerances part to part, what tests out and fits properly on my headphones may not be fitting on @KingForKings pair. And like I said we’ve refunded you for not meeting your expectations.

  • This type of thing keeps me up at night (it’s why I’m at the office at 10:30pm on a Sunday) and I don’t want @KingForKings or other passersby who see this to think that 1) I’d be dismissive of a customers’ issue and tell them to just ā€œjam it inā€. And 2) that we designed something ā€œout of spec by choiceā€. Both are not true. While I’m sorry that we weren’t more careful in our communication to you to make that clear, I’m also disappointed and sorry that the product we sent didn’t meet your expectations from the get go.

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So I removed the pictures because my dad actually gave wrong diameters of the thickness. The og cable is 5.9 mm and the metal part might make it impossible to plug into the NDH20. I sanded it down to 0.01 mm difference I think. I will still try to alter it because the cables are good. I’d say there is a possibility that only the NDH20 (also use by less than 5ish other headphones from other brands) is the hardest cable to make. James already send some info in the thread. I could try ordering a custom cable from Sennheiser if they dont already have one but man I have 3 addresses and unspecific number for German support. TD DR money back and I will still buy some connector to a new headphone probably for M1ST. Just beware outside NA, the NDA connector can be a hit or miss.

If you all need unbalanced cables that work for the the NDH20, these work, they also fit the HD 560s too.

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I’ll look into it when I get the ear pads in a few days I guess :slight_smile:


My pads broke so I asked Thomann (the main competitor against Music Store) if I can get new pads for warranty (EU has 2 years). It happened just suddenly last week. I think my glasses pulled the stitching when I removed my glasses… I only did it like 4 times in 1 year and the last time was really long ago. A pair is probalby 44.90€ with 16% taxes. Rona lowered the taxes from 19 to 16%