[Bassiklee]

That's true. I was emailing with sonion and they told me the same thing. They told me I don't need a crossover but I can use a crossover. is not the same thing a subwoofer directly connected to the source with a subwoofer with crossover. It will have a deeper bass.

Yes and no. It won't have deeper bass. It will have less midrange content, which will SEEM like more low end.

I still say that particular sonion needs no additional filtering to be thundering. These crossovers are very shallow slope, so it's not like a driver stops playing at 236.01Hz. At best, we're getting a 6dB/octave roll off. That equates to 1/4 the power at, in the frequency I cited, 472.04, and then another -6dB at 944.08, and so on.

 

[BigBublik]

Hi.

I have a question about shells.
I look at the shells that famous companies make and what they make them out of? I know - its printed on a 3d printer.
How do they make such a smooth and shiny?
I attached some pictures from internet.

 

[eunice]

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

 

[BigBublik]

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

I have experience printing such a resin from Dreve. But I don't get such a perfect smooth and shiny surface.

 

[eunice]

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

 

[BigBublik]

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

That's exactly what I'm interested in post-processing.

 

[Farquarl]

That's exactly what I'm interested in post-processing.

They either use a 3D printer which prints crystal clear from the start(can't remember the model name, something from envision Tec I think). Or they use a regular DLP or SLA printer and tumble their parts and lacquer them afterwards. At least that's how they produce hearing aids.

 

[528367]

 

[Bassiklee]

Yes that's true. You are right.
6db /octave roll of.
putting 2 capacitors and 2 resistors a second order low pass filter it will be a -40dB/decade or -12dB/octave. That means I must do better a 160hz "cut off"

This will act as a pure subwoofer. Like a home cinema subwoofer.
My goal is, A not midrange focused iem, with emphasis on sub bass.
So It will not bleed the bass into midrange.
Not only this, but using capacitors and resistors it will be way easier for use with daps. The resistance will go up and the output voltage to the drivers will be decreased dramatically.

So now you’ve lowered your sensitivity, and introduced quite a bit of phase shift. Have you tried listening to them without all this complicated filtering?? You might be pleasantly surprised

 

[Farquarl]

So now you’ve lowered your sensitivity, and introduced quite a bit of phase shift. Have you tried listening to them without all this complicated filtering?? You might be pleasantly surprised

You are exactly right, now you have a 90degree phase shift. Good luck compensating this with tube length to get the timing right.

 

[eunice]

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

 

[Farquarl]

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

45° at the cutoff frequency for a 1st order filter. 90° for a second order. You can compensate phase shift with tube length at the crossover frequency. So that you align the timing.

It is obviously frequency dependend and becomes harder the lower the frequency is because of the wavelength of such frequencys.

 

[eunice]

45° at the cutoff frequency for a 1st order filter. 90° for a second order. You can compensate phase shift with tube length at the crossover frequency. So that you align the timing.

It is obviously frequency dependend and becomes harder the lower the frequency is because of the wavelength of such frequencys.

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 to think about it the way you do.

 

[528367]

 

[eunice]

I'm waiting a new iec711 knowles - balanced armature coupler.

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