I am also pleasantly surprised by iPad Pro 10.5 sound quality. Comparing to Creative E3 on my laptop connected via USB, iPad Pro 10.5 blow the E3 out of the water.

I made my home made custom on August, then I put it aside and almost forgot to upload some results here =)      

Thx, Ujamerstand. [update: KA Damper now available at Mouser]    I have also ordered serveral items in Warner Tech Care. I asked Lee to ship it to Hong Kong. He then got me the estimated freight cost of my order: nearly $60 for $190 worth of material and tools. I am not sure whether accept...

Can anyone help me find a acoustic damper supplier, I google it for a long time and found nothing. What supplier should I contact?

Count me in! May be I can help in this project. It is so exciting!