Or you could also try to completely remove the thick paper damper filter and tune with the foam thickness....

How did you mod the ZES?

What mod did Akros do with the CXS?

I would bet it is a QC issue. I recommend to open them and share with us the photos of the drivers.

After trying most of budget earbuds in last 2 years, I can say the RY4s Plus is still among the best value in earbuds (it can be excellent when retuned). I've tried the pk2 only briefly.... it sounded fine to me (little less V-shape sig when compared to RY4s Plus), but I think it is overpriced...

why two holes? one is not enough?

I got the drivers with some tuning cotton on them and I just closed the bass vents with micropore tape. I do have powerful enough amps to drive them properly. I will report back when the build is finished.

I too can highly recommend the 32ohm composite beryllium driver. Without any special tuning in a simple MX500 shell it sounds excellent. Reminds me of the sound signature of RY4S plus.

In that case this driver goes to my collection asap. But I also cannot claim that I can properly tune earbuds ;).... Though to my surprise most of my diy drivers sound pretty good without any extra tuning (apart a simple horse shoe foam on vents and such).

Does the Newbsound 32pro uses this specific driver?

So who already tried the DLC drivers? (https://aliexpress.com/item/1005003536966575.html) Are DLC comparable to Titanium (composite)? I have no DLC earbuds afaik.

The LCP driver is also advertised as 130 ohm, I expect it is the same driver... Do you have a link for the 32 ohm N52 driver? Also Ry audio store on AE will make you earbud cable with 2.5mm plug on request for the same price as the 3.5 one. I just ordered one and I expect standard Ry quality.

Awesome! How do they sound? Btw. did you make the gold cable with 2.5mm plug yourself or did you buy it somewhere?

I wonder if you could compare the NRA with another MST (or EST?) hybrid, the SF MT300.

Thanks. So you say the biggest improvement of the sound can be achieved by replacing the potentiometer with good resistors?

So are these white caps 0.22uf 63V ? I did not find any WIMA caps with these parameters yet.... Are they same as in the previous version? (they measure about 7mm in length)

Any advice on replacing the original white caps for red WIMA 5%? Would you have a link with more info for the red WIMA 5%? I wonder if these caps are the same in the 2021 version...

Is there any difference between the 2.5mm and 4.4mm balanced outputs in practice? According to the tech specs they should be the same. Anyone here did a listening A/B test to compare?

I wonder how do they scale with more powerful sources and what would be the sweet spot regarding output power?

I am quite interested in the 150 ohm Smabat driver, so will be happy to see more of your impressions of its sound in the M2S Pro shell. And then your impressions of Zen 2.0 SQC... put against the M2S Pro. I'm not pulling the trigger on the Zen 2.0 SQC limited offer yet as I am not interested in...

I will have the ShoonTH Esep-01Bl next week as well as the highly regarded LBBS, will compare them to Zen LL.

The comfort and tuning makes the Zen LL a great choice for long listening sessions. I find the cable of standard version to be of good quality though a little bit stiffer. I don't think the more expensive cable would change their sound noticeably.