[mattmatt]

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.

 

[dhruvmeena96]

Noob question. How much does my choice of DD matter for this?

Depends

Just dont use tweeting DD and double damping will make it act as subwoofer enclosure

 

[Luffytaro]

you'll need a soundcard with both input and output. they have to be calibrated with each other.

Could you please share your setup picture?

 

[Luffytaro]

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?

 

[Luffytaro]

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 .

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 : )

 

[amemisome]

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.

 

[Wgibson]

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.

 

[mattmatt]

If you guys need any simple help, I might be of help. Just send me a message.

 

[discus123]

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.

 

[dhruvmeena96]

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

 

[Xymordos]

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

 

[musmecca]

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.

A very simple way on the 38 is to tape over the vents. I've also found it increases the speed.

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.

A very easy way to drop some db's on a 38 is to tape over the vents. It also increases the speed. I've done this on a few projects to great effect plus it's quite easy.

 

[Wgibson]

Try an L-pad

 

[Aldo40]

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.

I don’t know how you filtered your two 32254, but I think they need more ammorting. Do you have a long enough tube on them and a red filter?

 

[discus123]

I used this as my sample to fine tune my set of BAs. 38AM at start I used 20R but bass too much. I then added by 10R plus another 10R, the final FR I used is 100R. I guess the tube length for 38AM is too short, it needs to add at least 4-5mm more.

I have tried L-pad also, it did lower the output of bass but worst is it changed the clarity and transparency of sound also, that's my own feeling, so I give up.

I did use the long tube for 2x32254 for the final FR, I tried from 60mm then cut every 2mm for test till as short as 12mm. Yes, I used the red damper for 2x32254.

For final, I will try longer tube for 38AM if still not work, I will try @dhruvmeena96 method to leak some bass. Tape the vent of 38AM is a very good idea, you alarming me, thanks @musmecca, I will try it also. Thanks so much everybody.

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