Sorry for rambling then :) I think the presence region is said to be between 4khz and 6khz, but I don’t know what this is based on. I think everything above 1khz is relevant for the sound stage. I look for timing accuracy, meaning the waterfall chart shows similar attack/decay times over a broad...

The brain determines the position of a sound source by three methods: 1) Timing of the sound arriving at your ear. Left/Right/Distance is determined by the minute delay between left and right ear (a sound from the left arrives earlier at the left ear) and also between high/low frequencies...

I have no idea why that would be the case. What type of mic/adc do you use? I use an Umik-1 with its built in USB adc and I don’t have such problems.

Yes, they look very different. Maybe the closer knowles driver is the hodtec or hodvtec. The Sonion 33AJ007i/9 also might be a replacement.

Are you sure this isn’t just a bad seal?

If you can get it to work it would be a service to the community. The BS6+Z is a very good build and it would be too bad if it was not possible to replicate.

I am not sure, it could work. The BS6 has a small crossover circuit you'ld have to rebuild. I reverse engineered one and posted the details here: https://www.head-fi.org/threads/home-made-iems.430688/post-15008852 If Knowles DTEC has a similar impedance curve as the Bellsing DTEC this might...

I'ld suggest the Finale2, it's an easy build with outstanding detail. It's a bit light on the bass for me, but it matches your description very well. Diagram: https://crcit.net/c/7d75c8a5 See here for a comparison of a few I built...

I did not build 1, so don’t know about that. I would suggest finale 2 with a slight EQ to flatten the bass. If EQ is no Option, go for Finale 3, but it is an advanced build. A few links: Masm 3 pro https://crcit.net/c/4c8ad023 BS6 + Zobel https://crcit.net/c/49f54ed9 Finale 2 Reference CIEM...

Piezo electric

Thank you so much!

Thanks. Do you use the stock UV Source of the printer? It’s 405nm like my anycubic photon. If so I too can print optiprint guide 385. What are your exposure Settings?

The knowles one looks like its an adapter just for one balanced armature driver - i'm aiming to measure assemblies of multiple drivers. What printer did you use? Do you have a 385nm printer?

Thank you so much, I'll get the first one as it fits my minidsp umik-1

Do you mind sharing a link?

Nice! How did you get your hands on one of these? The one I have seen so far cost a fortune.

Now I understand what you mean. The phase shift is 0° for frequencies the filter lets pass completely and increases until the point where the filter lets nothing through. That limit is 90° for 1st order and 180° for 2nd order, but it's never reached in practise. I totally see why it makes sense...

2nd order is actually between 0 to 180 degree phase shift depending on the frequency. You cannot properly compensate phase shift with tube lengths.

They probably have laser SLA printers with very high resolution and maybe they lacquer it afterwards.

They are using biocompatible resin. There are different brands selling this, Dreve is one of them.

Very roughly yes. Reality is - as it is often - much more complicated. For once there is no such thing as a clear cutoff frequency. It is always a slope, with simple filters it is a pretty shallow slope, higher order filters have a steeper slope but require more components. Also using the DC...

Depends on how you wire it and the cutoff frequency is depending on driver impedance. Google RC Filter calculator for online calculators.

Chapeau. That is an achievement! I wish you a lot of joy with them.

If you want custom molded headphones go to https://thecustomart.com/ you can’t make them cheaper at home. If you just want ear plugs this is the wrong thread. Search ‚Proguard MYO‘ on Amazon.

I second that. It’s not comparable. I’ll love to have something that is as warm and relaxed sounding as an HD650 but still has the clarity and resolution of a BA. Since I have the Topping DXS7 the hd650 Sound again better than my CIEMs. Oh well, guess that’s a never ending hobby :wink: