[IvanDrago]

For sure: the 3 holes were closed before the measurement.

How does your measurement rig look like?
You have to bring the driver closer to your ears. Do you have a 3D printer? Please post a picture only from the inner cup.

 

[GourmetEnte]

Onkyo SN-1 Drivers.
Second unit came damaged.

 

[matzemedia]

But isn't the baffle still a giant slab of tree?

Ha, ha ... that is true Thanks for your PM and your recommendations @GREQ !

You have to bring the driver closer to your ears.

You are right. Now there is a better precision and high frequencies. But still not good enough compared to my AKG 701. At my simple measurements there is less differences:

yellow line: old mounting
red line: new mounting (closer to the ear)

The bass is great, but it just sound warm with less hight.

Do you have a 3D printer?

no. I currently just work with wood stuff.

Please post a picture only from the inner cup.

Here are the pictures with a closer mounted driver. I use now a much thinner plate so it comes closer to the ear.

How does your measurement rig look like?

It is a simple custom measurement rig with a condenser microphones and REW.

 

[IvanDrago]

But still not good enough compared to my AKG 701.

Some tuning tips from the T50 open alpha thread may help. Did you get tuning papers for the drivers? Otherwise i wouldn´t damage the paper on the back.

https://www.head-fi.org/threads/open-alpha-t50-3d-printed-headphone-project-from-mrspeakers.825868/

• The paper on the back of the Fostex driver has a significant effect on 1KHz and up. We have found significant variation in driver frequency response on the T50RP driver modules. These variations may often be addressed by manipulating the back of the driver in the following ways:
  • If you have too much midrange in the 1-3K range, placing an “air tight” object on the back of the driver reduces airflow and increases damping. Any solid adhesive material will do, you can use a tape with a good adhesive or even felt anti-skip bumpers from an Ace hardware. The more blocking material you apply to the driver the lower the upper midrange outputs (you may see an increase in high frequency output as well). Note some adhesives may clog the paper and continue to affect performance even if you remove the blocking part.
  • If you are not getting enough bass or mid-bass output, you may consider making a small perforation (e.g. a 3mmx3mmx3mm triangle) in the exposed paper. This is obviously a non-reversible action and should you not like it, may require additional modifications to the driver to re-balance it.

Some fluffy cotton in the cup and behind the driver could also help to bring the highs up a bit.

 

[xxGilgaxx]

Ha, ha ... that is true Thanks for your PM and your recommendations @GREQ !


You are right. Now there is a better precision and high frequencies. But still not good enough compared to my AKG 701. At my simple measurements there is less differences:


yellow line: old mounting
red line: new mounting (closer to the ear)

The bass is great, but it just sound warm with less hight.


no. I currently just work with wood stuff.


Here are the pictures with a closer mounted driver. I use now a much thinner plate so it comes closer to the ear.




It is a simple custom measurement rig with a condenser microphones and REW.

Do you know where to get the Harmon Target Response for REW?
I couldn't find any files for it

 

[matzemedia]

Do you know where to get the Harmon Target Response for REW?
I couldn't find any files for it

It is more than a year ago that I did my research in tuning. So I don't know exactly where I get my "Harmon Target Response". I just remember there are a few different "Harmon Target Response" out there. I put my files here at the post as zip.

May be this will help you too: There is an old video from Tyll Hertsens. He also explained the "Harmon Target Response" - but an older version without the peak at sub bass.

 

[IvanDrago]

But does this make sense, because your rig isn´t calibrated?

 

[matzemedia]

But does this make sense, because your rig isn´t calibrated?

Well not really, but it makes fun.

What I did to check if the rig is nearly correct: I've measured a headphone model where I had a measurement from an expert and compare this with my measurement. That helps to know about the tolerance of your rig. But I am a very beginner in this area. There is certainly better help here in the forum.

 

[IvanDrago]

Well not really, but it makes fun.

I know

 

[IvanDrago]

Fostex T50RP MK2 R.I.P.

 

[Bizarre]

I was interested in trying the 540 ohm beryllium drivers but 3d printing is so expensive, has anyone tried diy housings like this:

https://www.aliexpress.com/item/100...o.store_pc_groupList.8148356.8.708551306Mlg2b
https://www.aliexpress.com/item/33056745798.html?spm=a2g0o.detail.1000023.5.34333667tonlzi

Seems promising with a good hand in modding and good pairing drivers.

 

[verde57]

what Beyerdynamic uses this type?

128ohm With Tesla​

 

[IvanDrago]

what Beyerdynamic uses this type?

none

 

[verde57]

I'm undecided between this 128 ohm and the 250ohm one.
they look different in execution

 

[Philimon]

HD800 drivers