Home-Made IEMs
Aug 31, 2020 at 9:14 AM Post #11,476 of 13,621

musmecca

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That looks absolutely great!! Though, from that curve it looks like you have dropped almost 50db at 6k? Surely that can't be true?
Unfortunately it may be true! Dhruv made some comments about pinna gain as well as some previous commentary on old peoples negative sensitivity to higher frequesncy..I am 57 years old and when I put them in my ear, they sound great...his understanding may hold the key as to why. (and yes, that 2% shimmer is now bothering me!). I believe you have the same mic (umik1) and REW setup as me...have you finished your coupler as I'd like to see how your rig compares.

Last, he commented on the Lpad for the sonion, but really for its LP abilities. I'm sure you would lke to see that explanation as I thought it was only to tame the DB...
 
Aug 31, 2020 at 9:20 AM Post #11,477 of 13,621

jameswalker

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I have only so far done a sweep on my existing IEMs, nothing custom yet. But this is the CAD model:

1598879964740.png


And as per an earlier post here is the sweep I took:
1598880014888.png


I will take a picture of the setup when I do it properly with my CIEMs.
 
Sep 2, 2020 at 6:19 AM Post #11,482 of 13,621

Farquarl

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Hi, just a quick question.
For IEM's, about how much should the voltage be for the capacitors?
And for ceramic capacitors, are capacitance loss not an issue for IEM's?
Thanks!
Don't worroy about the voltage the limits of normal smd caps are good enough. On the account of internal losses in capacitors I never really thought about it. But my guess is that the effect is negligible. Maybe someone else who knows more can contribute some insights.
 
Sep 2, 2020 at 10:40 PM Post #11,488 of 13,621

johnchpark

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I'm starting out and trying to get a set of capacitors & resistors of wide values.
I found these two on Alieexpress, but I was wondering if anyone had better suggestions/sources.
I'm a little concerned with the tantalum capacitor Im linking below, because I know they have +/- polarity, so not sure how I need to wire them.
Do I just put the positive lead of the 2-pin jack to the + end of the tantalum capacitor, and take the - end of the capacitor to the + end of the driver?

https://www.aliexpress.com/item/2025736704.html?spm=a2g0o.detail.1000023.15.495279d0qnxw14

https://www.aliexpress.com/item/32368758351.html?spm=a2g0o.detail.1000023.7.495279d0qnxw14


Thanks so much!
 
Sep 3, 2020 at 1:47 AM Post #11,490 of 13,621

johnchpark

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Any reason why you want to use such big SMD resistors? Go for 1206 or smaller!
Also ceramic resistors are better and do not have polarity use them.

Ah didn't realize they came in different sizes.
Would the links below suffice? Thinking of getting a bunch of different values individually; although 100pcs/value is a little excessive...but prices per lot seem super cheap so I guess not a big problem.

Or do you guys have any vendors where you guys usually buy from?

https://www.aliexpress.com/item/328...earchweb0_0,searchweb201602_,searchweb201603_

https://www.aliexpress.com/item/329...earchweb0_0,searchweb201602_,searchweb201603_

thanks!



UPDATE;

Seems like capacitor quality matters, so I think I'll be going with some 6.3~16V 1206 ceramic SMD Kemet/Murata/TDK from Mouser (although they're a lot more pricey than the Alieexpress ones).

Also, I saw that people recommend wire-wound resistors, but looking through Mouser, the smallest size wire wound seem to be ~11mm in length. Wouldn't it be harder to fit into an IEM shell?
 
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