chinsettawong

Aumkar and I had a good time on Saturday. We started the day with a short city tour. I took him to visit the Temple of Emerald Buddha, Grand Palace, and Wat Poh. Then we had lunch with a few of my headphones lover friends. After that, we had a mini headphones meeting. At the meeting, we had Stax SR007 MK1, SR009, My DIY Orpheus Clone, Omega Clone, JF Clone, and of course Aumkar's RR1 headphones. I brought my KGSSHV Carbon, KGST, and KG Grounded Grid, and my friend brought his DIY 300B single ended amp. The RR1 showed very good performance with all the amps we tried. The treble was just right and the bass was impactful and deep. I think they're good headphones for fast music. Aumkar kindly gave me a pair of RR1 and an extra pair of drivers for me to play with. Here are some pictures of the stators, spacers, and dust shield. I'm very impressed to hear that he actually machines down the 4 mm aluminium sheet to 0.8 mm so that he can have the absolutely flat stators. The look and feel of the headphones are good. Aumkar told me that all the cups are 3D printed, sanded, and painted in house. With all these labor intensive works, the result is quite impressive. I basically can't tell that these components are 3D printed at all. All my Thai friends like his headphones and have already asked me to help place their orders with Aumkar.

So beautiful!

I think you've stretched the diaphragms too much.

These are my measurements: I also don’t really know how to read them. However, my headphones’ graphs show pretty similar patterns to the Stax’s 007 MK1’s. Your headphones’ graph is so flat. Maybe you should retest them again. How is your bass compared to the 009S?

Very nice!

Believe me; soon you'll prefer your DIY phones "sonically" over Stax.

Your arcs and headband look exceptional. Very nicely done! Are they 3D printed? What material do you use?

Do you notice that with the new stators you've made, the phones sound less bright?

? It’s nice to see you already get hooked into making the headphones. I’m sure you’ll figure out what is wrong. What spacer thickness do you use?

Very nice!

I believe the 580V Stax bias voltage with 5M ballast resistor is safe for HE90. I have tried the HE90 with some Stax amps in the past, and I didn't notice any problem. However, if it will make you feel better, reducing the bias voltage to 500V and adding additional 5M ballast resistor are the way to go.

Waiting for your coming to see me.

Nice! Is the property of your film any different than a typical Mylar film?

Hi Aumkar, Wow, 0.45 mm D/S distance is nice. How big is your diaphragm? Wachara C.

The driver looks very well built. I'll get a pair too.

@mwl168I do not need the mini T2 boards as I've got some already. Thanks for putting me in for those PS boards though.

3 sets for me.

Is the GB going to be the fully assembled ones?

@JoaMat Do you recommend that we use the original T2 voltages or +400V/-460?

From the schematic, the mini T2 will be using +220V, +400V, -460V, +15V and -15V. I'm thinking of using the PS board from my prior KGSSHV build. Is it possible to use a simple voltage divider to get the +220V from +400V? How much current does each voltage draw?

Could you kindly share the Gerber files? Or are there anymore boards to be grabbed?

Interesting. How is the sound as compared to the full size T2?

Very nice looking earpads.

They don’t look like DIY to me. Well done! Can you tell us more about it? What is the dimension of the driver?

Really like to see the inside of the headphones.