If politicians left the USPS run as a business instead of using it for political gain. It would be excellent. They’re pretty good as is despite it all.
Read this and understand. PolitiFact | Widespread Facebook post blames 2006 law for US Postal Service’s financial woes
In the years I’ve had ordering audio crap, I’m had one issue and that was because I filled in my own shipping address wrong. So, not even one issue.
As bad as USPS might be, it nowhere near as bad as it is here in Israel…
A few days ago i got a package i ordered back in December 12th, the funny thing is that was already in the country 29th, somehow it took them 3 months to “sort it”, before you say “customs” , it wasn’t i checked with them they cleared it within a week, also it was a package worth 60$ under the customs threshold…
FedEx, DHL, etc also have very high fees, and some of them have hidden fees that you find out only when the package makes it to the country…
Based. USPS is actually one of the highest regarded postal services in terms of efficiency, and a great example of what a virtuous publicly owned business looks like (when unhindered by malicious external forces of course lol).
So i finnally got them, still got some testing to do but I can say for sure they ain’t grado lvl…
A few things I noticed right off the bat:
They are way heavier, the solid metal cups a quiet heavy.
They are not as comfotble, because of the weight difference the headband padding isn’t enough unlike the Grado which are very light so don’t need a lot of padding up top.
They sound very different - still need to listen to them more extensively but they are not Grado quality. My initial impression is they are “shouty”, hollow and lack detail, and the “punch” of Grados.I think they very mid focused but like I said I need to listen to them more. Also I’ve tried pad swapping a bit both the pads they came with and my Yaxi Grado pads
They need more power, When using them on my topping A50s they needed high gain at around 11 a clock, while my Grados run fine on Low at around 9-10 a clock (also tried them on the IFI zen can). Though running them balanced does help to put them on the same setting as the Grados
The accessories are a highlight - Both the pads they come with are the extra pads are great (Pretty sure the extra ones are the same as Zeos uses for KPH30I ultra). The cable is pretty decent nice weave and you get a small pouch for other stuff
Even if I don’t like the sound too much, just the pads, cable and pouch make up for them being sub par
Im might experiment with more pads see how they work
Sucks for the comfort though, kind of makes even just using them as a case to put grado drivers in impossible.
Impossible, no.
Unlikely Yes.
The weight i think is the cups, not the drivers, since its all-metal not plastic
BTW after a little experimenting, I got them to sound pretty decent but ill try out a few more things.
If you look at the driver, you can see there is different tuning. The Grados have holes and a thin sheet of paper like matrial, while the OP 2000 (thats what they are called) have just a metal grill thats almost does nearing nothing in funneling the sound also there is no dampening on it.
Basically what i did was i tried to tune them similar to Grados, used these pads i had around
https://www.amazon.com/gp/product/B00TGCDHL2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Along with some foam i had from another set of pads i had. and the result is way better, I still don’t know if the best i can make them but its an Big improvement
I just meant that if they’re uncomfortable, then it would be kind of pointless, for me personally at least.
They might just need a bit of modding like additional padding on the top
I mean, if you can pull that off as well, you might end up having god tier grados on your hands.
I’m kind of disappointed that they are actually 50mm drivers. This means that it’s not as simple as popping an SR80e driver in since those (and most Grados) are 40mm.
I wonder if some if the other various listings for this kind of thing that stated 40mm drivers actually have 40mm? If so, then those could be good for mods.
Lastly, even if you swap Grado drivers in there, that grill on the back would really affect the sound. It looks fairly closed, and Grados change in sound if you just hold your hands near the backs, so I imagine these grills would make a fair bit of difference.
Im not 100% convinced they are not Grado drivers while the housing might not be the same but the driver might actually still be Grado. and after pad swapping they got pretty decent.
Maybe a more experienced modder could actually make them “S-tier” but that’s beyond me
The big upside for these for me at least is that these kind of mods like pad swapping are viable for a noob like me, while having a detachable table is way beyond what im willing to do
OK good news, they are better than my initial impression but they have to be burnt in.
Still need to spend more time with them but with the large pads, they sound pretty good. Good bass , decent imaging, mids seem good, highs are a little recessed, the sound stage is fairly small but i think its due to the small vent holes.
Hopefully getting better padding on the headband will resolve the comfort issues for the most part (they are still really heavy)
Zeos has an upcoming review on a similar model, he was getting better sound from them by removing the back cover. Just by screwing it off.
Hm… interesting idea…
i might look into that, or will wait for the video
Edit: Ill be damned, it just screwed off like a lid, no actual screws… still have to look into the sound but this headphones just seems more and more fun the more i play around with it
Just saw that Zeos did a video on what looks to be The OpenHeart OH2000 or as he mentions one of the many versions of this DIY set that are on AliExpress and also here: Grado Style Open Back Headphone Kit with Metal Cups (Black) – Earphone DIY Labs.
I’ve had the OpenHeart OH2000 for a long time now (pretty much ordered them as soon as they showed up on AliExpress) and tried all kinds of configurations to try get the comfort and sound just right. To be honest they didn’t get much use since I couldn’t nail either. I’ve played around with the included S-Cush and G-Cush pads but both had their shortcomings for me.
The G-Cush sounded decent but the comfort for me was awful. Couldn’t get them to sit comfortably, my ears kept sliding so that the edge of my ear would touch the cold metal grill and the rest would rest against one side of the cup. Also since I wear glasses they didn’t want to seal well. I even tried washing them in warm water with shampoo/conditioner to try and soften them up, which helped a little but not enough.
As for the S-Cush the comfort was better but the thickness of the pad made the sound suffer with the highs getting muffled and mids sounding a little thin in some songs. The bass was punchy but overall on balance with the highs and mids. An decent experience overall if you like a more flat sound signature but for me personally it always felt like there was more there but you missed out on it due to the pad.
Finally I ordered wang_yifei’s L-Cush pads. They provided a decent in between for me and were what stayed on the headphones since. An interesting 3 layer design; the exterior layers consisting of firmer and denser foam with a softer and more open foam sandwitched in between. The pads came with foam disks to insert in the middle of the pad and provide some cushion against the speaker grill. There is very little difference in sound while having it in or not. Definitely recommend having it in since the cold metal grill isn’t exactly comfortable. The sound is quite similar to G-Cush pads however in this case they provide the best comfort for me personally is the best of the 3 pads. The highs and mids are nice and clear and the bass is slightly more present compared to the S-Cush pads. The pads are on-ear however the do cover the entire ear in my case and provide a little bit of a seal. If the provided pads don’t quite work for you these are an easy recommendation in my opinion.
Also after watching Zeo’s review I’ve finally tried unscrewing the backs of the cups and they do sound better without anything on the back; fully open. Also another thing to try is use large over ear pads. I’ve tried it with some pads I had for my Fidelio X2s and sandwiched them between the cups and my head since there is no way to mount them unless you’d modify the inner ring to fit large pads. Honestly this might be the definitive way to mod them. The bass gets a lot more punchy and drowns out some of the harsh highs that these drivers push out.
Overall I grabbed them for £38.29 total so not a huge loss and I listen to them from time to time since they do sound good for acoustic/vocal heavy songs. If you can get them cheap and want to something to tinker with they are definitely good for that.
I actually used the black padding on the back just to keep the dust out (not much of sound difference) but ya they are a fun pair to experiment on with pads a foam and all that kind of thing, they might not be “end game” but you can certainly make them halfway decent and even pretty good if you manage to tune them.
And since they are so easy to take apart you have a really fun time without having to worry about any real damage you might do, worst thing you can do is you over paid for a handband, a cable, pads, and other random shit.
I’ll try the L-cush pads, see if they get any better for me
Hi everyone. I registered here just to reply this thread. I watched the video zeos made. It seems likely that drivers are 50mm and the 40mm on the “name” of the headphone is just a typo. Zeos did note that driver looks big for 40mm and to me the distance from driver to the cup edge looks same as on oh2000. Driver also looks the same. Internal wiring is different color.
I’ve written about oh2000 on head-fi but since there is no dedicated thread there I’ll write my impressions here and talk about driver transplant I did.
I want go into build quality. It’s excellent like Zeos said. He was very comprehensive. 
One thing I noticed that I think was not mentioned is that L - R indicators on the rodblocks are on “wrong” sides. On grado headphones rod goes behind the headband but on the chi-fi headphone it is at front.
I also agree with Zeos about how these sound stock. Ice pick through eardrum sounds like a soothing alternative compared to listening stock oh2000.
This is a measurement I made. Minidsp ears and even most of the more expensive measuring devices are notoriously bad at measuring higher frequencies so this is in no way accurate measurement. But it is accurate enough to show oh2000 is excessively bright headphone. I put Beyerdynamic DT1990 there for comparison as it also has elevated treble.
As stock there is not much to be said about OH2000.
Thats about it.
I tried some modifications but I did not get them to sound like I would have wanted. I think it’s because of the bad driver. Many headphones use drivers that look the same, v-moda, Somic, Ollo, and TDK come to mind. I have fiddled with Ollo S4 and Oh2000 driver side by side and I can say for 100% that they’re different drivers that look the same. The way diapragm reacts to touching is very different. Ollo’s driver is a lot more responsive and will dent if poked. OH2000 driver is just a piece of thick plastic that does not move much if pushed.
So the driver needed to go. As replacement I chose Peerless HPD-50N25PR00-32. It’s a tried and true driver used in original Kennerton Vali, Aurorus Audio: Borealis & Australis and in Hyland Headphones. Drivers cost about $10 for a single unit at parts-express and digikey. I thought if it’s good enough for a $1000 headphone it should be good enough for this $50 project.
By now everyone knows how to open the headphones. Just twist them open like bottle caps. Driver came off just by pushing it. Solder points were protected with some black goo. I recommend cutting the wire high enough so it’s clean. I don’t think soldering that goo on a new driver is a good idea. There is a small + on peerless driver. Thats where you want to solder the red wire.
After you have soldered the new driver, put it in place. It should sit firmly. Now things get bit tricky. Edge of the driver is too thick so the front cover won’t fit back anymore. You need to cut of some of the plastic edge.
I used a small carpet knive blade. What ever you use just make sure it is VERY sharp. It looks bit risky but with a sharp blade it is easier than it looks. Driver is stable in the housing so you should get a good grip. Just don’t wave the blade over the driver. The magnet is very powerfull. After you’ve cut enough to fit the driver cover back in you can glue the driver in place from the inside. Of course if you are certain you won’t break the driver you might as well glue it before cutting the edge. I did not even glue the driver so this step is optional. Now the hard stuff is done!
For me oh2000 is a bit loose. Headband is too wiggly for those heavy metal cups. I bend the headband quite a bit to get a tighter fit. It seems the headband is pretty much undestructable.
I tried some modifications but I ended up not using any. I did leave the cups open though. There was not much measurable difference in frequency response but I think without the back covers things just sound bigger somehow. I might make a permeable back grille from a sieve or something. I use the G cushions only. Small ones still sound bad.
Here is the frequency response. Sennheiser HD6XX is there for reference. Notice how basslight HD6XX looks on the measurement. That will give a better understanding to the bass level of OH2000.
What we have here now is a very unique headphone. It has bass that no Grado can match. It does not sound as airy as Grado’s do. Partially it is because of lesser treble quantity but I think it is also because this paper dome driver is very different from Grado drivers. Even though this is not as airy as grado it is still 100% open design with foam pads. It’s free of all sort of nasty reverbs and colorations. I think Timbre is excellent. What I love most about these is the “kick in the face” sort of sound. I sold my Focal Utopia last week and I’m allready missing the dynamic sound with slam. OH2000 does not hit as hard and of course these can’t match the speed of Utopias. These can’t spook unfocused listener like Utopia does. Still the incisive way these bombard listener with music is reminiscent of Utopia. Presentation of dynamics is also on a level I find stupid good considering what kind of money were talking here.
Overall I find very little to fault here:
So whats next? I was very surprised that these sound this good just with a driver transplant. I expected I would have to mod these extensively. Headband would need some sort of comfort mod. Should be easy to do. Traditional style earpads would be more comfortable but those will allmost certainly mess up the sound. I’ve tried some stuff to place the cushions in a angle. There is a noticeable improvement in soundstage debth when ears get further from the drivers. That is something definately worth experementing. I like the bass quantity but if someone likes to tone it down it is easy to do by partially blocking the big vent on drivers magnet. Maybe something like 10% reduction could be nice if that would tighten up the bass a tad. Maybe a piece of foam behind the driver would work best.
I hope someone else would try out the peerless drivers in these. Would be nice to hear other peoples impressions. Like people have said with the build quality of the headphones there is not much to loose and drivers are only $20.
To conclude this rather lengthy first post I want to clarify that I’m not a stranger to affordable headphones. I’ve been seriously into headphones since 2010-2011 and over the years I’ve had about 200 headphones. Most of them affordable. So I did not just go from Utopia to these and get surprised by backwards effect of diminishing returns 
Great post, welcome to the forum.
Wow im really happy that someone took up the mantle of heavily modding them, and that fact that it only cost you 20$ for the drivers is amazing.
I dont trust myself to enough to have the skill to do that kind of modding so im left with most pads, tuning materials etc, though i got them to an “OK” place, maybe some days ill get another pair and mod them with new drivers along with my 3rd set of KPH30I for a detachable cable mod, but until then im just happy to see folks really
