Home-Made IEMs
Mar 5, 2021 at 9:14 PM Post #12,436 of 13,621

Wgibson

100+ Head-Fier
Joined
Aug 18, 2020
Posts
277
Likes
228
Location
Tulsa, OK
How do people implement DTECS? Or anything with a peak between 1-2k?

Damp it and let that peak lead into the 2-3k peak of your mid/high drivers?

Use for mids only, with a separate low driver and mid/high driver(s)? (Edit: that are both louder than the DTEC, so series resist or Lpad the DTEC?)

Nobody really wants a peak starting at less than 2k, right?

Got a few cheap ones and just measured them: 31985, 31323, 30265. All pretty similar.

Maybe good for a hybrid project with dynamic for low end and some other BAs for mid/high?
 
Last edited:
Mar 5, 2021 at 11:24 PM Post #12,437 of 13,621

JEHL

500+ Head-Fier
Joined
Apr 16, 2020
Posts
807
Likes
560
Location
Tegucigalpa, Honduras
Yellow damp DD till you get a lowpass
Highpass the mid and uppermid driver so that it can have F3 rolling point at 300Hz somewhat and you will get SeeAudio Yume style of bass
Flat mids and then a subbass shelf

Simple

It's the experiment which let us innovate weird stuff
Noob question. How much does my choice of DD matter for this?
 
Mar 6, 2021 at 8:21 AM Post #12,438 of 13,621

Luffytaro

Head-Fier
Joined
Dec 29, 2020
Posts
53
Likes
43
Location
Vietnam
Hello you guys, I am intending order coupler 711 on aliexpress to measure my build, we only use coupler connect with the computer to work, or need a device to transfer signal to computer?

I see video below have a board to connect ciem with computer to measure.

 
Mar 6, 2021 at 9:19 AM Post #12,439 of 13,621

amemisome

New Head-Fier
Joined
Feb 3, 2021
Posts
24
Likes
11
Location
Netherlands
Hello you guys, I am intending order coupler 711 on aliexpress to measure my build, we only use coupler connect with the computer to work, or need a device to transfer signal to computer?

I see video below have a board to connect ciem with computer to measure.


The one I ordered had written in the description that it only had a normal 3.5 mic cable, so if you don't have one of those ports on your computer you may need either a splitter or usb to mic adapter. I don't have one on my laptop, so I bought a ~$5 usb hub that the seller I bought from also sold.

Interesting video btw, very in depth but I only don't understand why they would graph drivers and the final product with steps of 20dB?
 
Mar 6, 2021 at 1:24 PM Post #12,440 of 13,621

mattmatt

100+ Head-Fier
Joined
Feb 11, 2012
Posts
268
Likes
166
Hello you guys, I am intending order coupler 711 on aliexpress to measure my build, we only use coupler connect with the computer to work, or need a device to transfer signal to computer?

I see video below have a board to connect ciem with computer to measure.


you'll need a soundcard with both input and output. they have to be calibrated with each other. :)
 
Mar 7, 2021 at 9:40 AM Post #12,443 of 13,621

Luffytaro

Head-Fier
Joined
Dec 29, 2020
Posts
53
Likes
43
Location
Vietnam
The one I ordered had written in the description that it only had a normal 3.5 mic cable, so if you don't have one of those ports on your computer you may need either a splitter or usb to mic adapter. I don't have one on my laptop, so I bought a ~$5 usb hub that the seller I bought from also sold.

Interesting video btw, very in depth but I only don't understand why they would graph drivers and the final product with steps of 20dB?
You mean that if we have soundcard inside computer and have 3.5 or usb port, we only need to buy coupler 711 to measure?
 
Mar 7, 2021 at 10:17 AM Post #12,444 of 13,621

Luffytaro

Head-Fier
Joined
Dec 29, 2020
Posts
53
Likes
43
Location
Vietnam
Hi all

I am testing to see the different between among without resistor, series resistor and parallel resistor with 38D1X. I dont have any device or tool to measure, poor me :frowning2:.

I use a resistor 12ohm, the sound output of 3 cases above are quite similar (mostly volume are equal). I thought if resistor parallel with driver, Zsum <12, --> power is increase--> sound will be bigger. But might I am wrong : (.

But if I make low pass filter on this driver ( cap 68mF paralell, resistor 12ohm series), the sound is really small. So, resistor just work to tuning the sound when we apply it in high or low pass filter, corect? Or I'm wrong somewhere and dont recognize? Hope every get my point : )
 
Mar 7, 2021 at 1:20 PM Post #12,445 of 13,621

amemisome

New Head-Fier
Joined
Feb 3, 2021
Posts
24
Likes
11
Location
Netherlands
You mean that if we have soundcard inside computer and have 3.5 or usb port, we only need to buy coupler 711 to measure?
If you have a soundcard in your computer with a dedicated 3.5 mic in and dedicated 3.5 stereo out it should be fine. I would not count on the 711 to come with a USB mic unless stated differently in the item desctiption.
Having the soundcard's input and output calibrated like @mattmatt suggested would be optimal, but to get it to even work you will at least need a dedicated 3.5 mic in and 3.5 stereo out. Most decent modern soundcards or PC's in general should have a dedicated 3.5 mic in, so you will probably be fine unless you use a 10 year old laptop like me.
 
Mar 11, 2021 at 12:06 AM Post #12,446 of 13,621

Wgibson

100+ Head-Fier
Joined
Aug 18, 2020
Posts
277
Likes
228
Location
Tulsa, OK
For frequency graphs I use a USBc hidizs dac, and dayton imm6 mic on USB. For impedance, use the hidizs out and an impedance jig 3.5mm input to the mic port on my PC's sound card. Both calibrated in room eq wizard. Pretty straight forward, and making the impedance jig is simple compared to wiring IEMs. You should make the jig first in my opinion, practice your wiring, soldering, and troubleshooting.
 
Mar 15, 2021 at 2:51 AM Post #12,448 of 13,621

discus123

New Head-Fier
Joined
Mar 26, 2017
Posts
27
Likes
24
ve8 my fr #96.png
ve8 fr waterfall.png


Hi all, anybody have tried this set of BA, 38AM / 37AP / 2x32254, I wanna reduce 3-5 more db on bass. I have used a very big value of resistor already, but it still cannot lower the output on bass. Besides series of resistor, any method of wiring can tame the volume of output of 38AM. Thanks all.
 
Last edited:
Mar 15, 2021 at 4:46 AM Post #12,449 of 13,621

dhruvmeena96

Headphoneus Supremus
Joined
Dec 13, 2014
Posts
2,705
Likes
1,411
Location
Gurgaon, India


Hi all, anybody have tried this set of BA, 38AM / 37AP / 2x32254, I wanna reduce 3-5 more db on bass. I have used a very big value of resistor already, but it still cannot lower the output on bass. Besides series of resistor, any method of wiring can tame the volume of output of 38AM. Thanks all.
Make a bass leak tube with damper in it
 
Mar 15, 2021 at 6:31 AM Post #12,450 of 13,621

Xymordos

Headphoneus Supremus
Joined
Aug 8, 2010
Posts
1,699
Likes
213
Location
Hong Kong
94 v31 VE8 38am 47uf_PPL Dyw S400R 37ap015 52uf_PPL ST Dgn 16mm 32254 RW S20.5uf S155uf 1x3225...png94 v31 VE8 38am 47uf_PPL Dyw S400R 37ap015 52uf_PPL ST Dgn 16mm 32254 RW S20.5uf S155uf 1x3225...png

Hi all, anybody have tried this set of BA, 38AM / 37AP / 2x32254, I wanna reduce 3-5 more db on bass. I have used a very big value of resistor already, but it still cannot lower the output on bass. Besides series of resistor, any method of wiring can tame the volume of output of 38AM. Thanks all.


What are your crossover values? o.O
 

Users who are viewing this thread

Top