Home-Made IEMs
Mar 26, 2021 at 9:40 AM Post #12,497 of 15,989
But this is a series setup right? Will the series and parallel setup have the same sound?
Series will effect the sound and parallel will also effect the sound. It depends the crossover , the impedance of the drivers , the spl and voltage.

I know for sure that this connection ( see foto below ) isn't a good idea.
 

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Mar 26, 2021 at 4:37 PM Post #12,499 of 15,989
Can someone sketch a few options for an RC low pass on a woofer, with other drivers wired in parallel? If all drivers are in parallel, a low pass capacitor in parallel will low pass all of them...
First image is a first order crossover.

Second image is second order lowpass filter , midrange and tweeter first order highpass filters.

Third image is second order low pass with series connection 2x woofers , second order bandpass( midpass ) filter and second order high pass filter.

All are connected in parallel.
 

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Mar 26, 2021 at 7:17 PM Post #12,501 of 15,989
Anyone know a source where I can get Universal empty IEM shells for 2 Pin connectors? I only find 3D printed ones for MMCX. Searching on Taobao does not really yield results, as I don't speak chinese and don't know what to type in
 
Mar 26, 2021 at 9:19 PM Post #12,502 of 15,989
Anyone know a source where I can get Universal empty IEM shells for 2 Pin connectors? I only find 3D printed ones for MMCX. Searching on Taobao does not really yield results, as I don't speak chinese and don't know what to type in

I use a hot knife to modify them for 2 pin connectors, it's not too difficult just be careful. Also can't find those on taobao, and I have looked a lot.

Edit: example:
 

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Mar 27, 2021 at 8:54 AM Post #12,504 of 15,989
Hi again,

Can anyone teach how to tin litz wire cut in half?
Depends on if it has laquer on, just sand the laquer off at the area you wanna tin, heat it up with your solder iron and push tin against the wire while heating it up, will soak up the tin.
 
Mar 27, 2021 at 9:29 AM Post #12,505 of 15,989
@Max spl perfect, thanks. I had been trying to use the mid full range (no crossover) so it was also getting low passed.
First image the fullrange driver is low passed.

Second image the full range isn't low passed.
Edit: I guess high pass on the mid can help you set a nice steep bass shelf, like a Harman curve.
Yes , for the bass shelf also . The reasons I personally cap all drivers is for the impedance that amplifier sees. All drivers with caps, the amplifier doesn't see them connected all in parallel which is not the best and I don't recommend but each driver has its own impedance at the desired frequencies and the performance of the driver’s increases a lot in compression with non Caped drivers.

Also no caps with 2 different drivers ( woofer- fullrange ) merged in one tube, each driver may cancel each other with a result a muffled dark sound .


Also check this link. Is a calculator for power sharing in parallel.

http://brianswatton.co.uk/Speaker_Impedance.htm
 

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Mar 27, 2021 at 9:30 AM Post #12,506 of 15,989
Depends on if it has laquer on, just sand the laquer off at the area you wanna tin, heat it up with your solder iron and push tin against the wire while heating it up, will soak up the tin.
I got the litz wires from soundlink. It's already tinned, however I want to cut it into shorter wires for my crossovers so that the cable/wire management will be more manageable.
 
Mar 27, 2021 at 10:13 AM Post #12,509 of 15,989
Hi all, this is my first ciem, I build with 3D koi fish. The lacquer look better than previous one, indeed must sand shell stritcly to get smooth surface after lacquer.

Do you all have experience with black color? I mix with uv glue. But after UV, its still not dry completely inside although outside is hard.
 

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