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Home-Made IEMs - Page 257

post #3841 of 3855
Quote:
Originally Posted by piotrus-g View Post
 

In the process there's high chance you can bend the housing. A lot of trouble especially when you are able to purchase vented version of the driver.

 

True, but it's also very fun in its own right :D

Quote:
Originally Posted by MuZo2 View Post
 

Lets say you vent a CI whats the benefit?

 

More sub bass, longer bass decay.

Quote:
Originally Posted by grushaaa View Post
 

 

Whether it's better or not depending on how you implement your LP. I personally don't like vents on BA in general.

You can pick anywhere else to make holes if that makes the process easier. Beware of debris falling into the casing, plus if the hole is too large there's no way back LOL

post #3842 of 3855
Quote:
Originally Posted by piotrus-g View Post
as one of "big-brand" cIEM company modifies driver housing by drilling or cutting the back of the driver.

Any graphs available to see difference of ported vs non ported CIEM, to see effect on the sub bass?

post #3843 of 3855
Quote:

Whether it's better or not depending on how you implement your LP. I personally don't like vents on BA in general.

You can pick anywhere else to make holes if that makes the process easier. Beware of debris falling into the casing, plus if the hole is too large there's no way back LOL

Can't you just use Scotch tape to tape it if its too big? 

post #3844 of 3855

Personally I'm not a fan of vents on BA either. Tried both and found that I tend to like the sound of the non-vented version better.

 

I compared a CI22955 vented and non vented. Frequency wise the vented version is louder in the bass. But it was only a quick scan since I accidentally removed the solder on the center tap of one of them, and I filled the hole up afterwards, so I don't have a pic. 

post #3845 of 3855
Quote:
Originally Posted by MuZo2 View Post
 

Any graphs available to see difference of ported vs non ported CIEM, to see effect on the sub bass?

 

 

Quote:
Originally Posted by RealSpark View Post
 

Can't you just use Scotch tape to tape it if its too big? 

 

I used blutak, ugly as hell though.

post #3846 of 3855

tranhieu,

Wow, amazing work! Bass like subwoofer! Maybe you give a photo in what place did vented hole

post #3847 of 3855
post #3848 of 3855
Quote:
Originally Posted by grushaaa View Post
 

tranhieu,

Wow, amazing work! Bass like subwoofer! Maybe you give a photo in what place did vented hole


Yeah but you realize the graph presents difference between vented and non vented drivers, right? which means that vented driver improves around 3dB over the non-vented in lowest region.

However in my opinion this still doesn't represent what is happening.

Please check graph below. It's 37A007 and vented version 7C/8, same tubing, brought to 1kHz to show the difference. Measured with IEC-60318-4

 

As you can see there's pretty much no difference in sine-wave graph in bass region other that 1dB difference. Both drivers works flat. However what happens in CSD is another story and that probably counts more.

post #3849 of 3855

Ah I forgot to add both CIs were measured with the same low pass filter.

I suppose the added SPL and the tuning frequency depend on the type of driver and how large the vent is. The 3700 seems to have roughly +6db @ 1.5kHz in that graph.

 

Quote:

Originally Posted by grushaaa View Post
 

tranhieu,

Wow, amazing work! Bass like subwoofer! Maybe you give a photo in what place did vented hole

Sorry, scrapped them all. It was long ago and I haven't drilled anymore since then.

post #3850 of 3855

Thanks Piotrus.

 

I think most typical driver is sonion 3300. For me this graphics is an indication how to change frequency depending on the size vented hole

 

Sonion 33AJ007i

without vented hole

 

Sonion 33AJ007i/9

have little vented between contact

 

Sonion 33AJ007i/8

have big vented hole

 

I think such holes must approach to knowles DTEC, hes dont make vented driver


Edited by grushaaa - 6/25/15 at 10:04am
post #3851 of 3855
Quote:
Originally Posted by grushaaa View Post
 

Thanks Piotrus.

 

I think most typical driver is sonion 3300. For me this graphics is an indication how to change frequency depending on the size vented hole

 

Sonion 33AJ007i

without vented hole

 

Sonion 33AJ007i/9

have little vented between contact

 

Sonion 33AJ007i/8

have big vented hole


Obviously you are right, but if you brought them to 1kHz the difference wouldn't look that big.

post #3852 of 3855

At what frequency is best to do the intersection crossover so as not to lose the bass? I think the lowest bass should not be affected

post #3853 of 3855

Found these interesting graphs. They are the FR measurements from Unique Melody. Top one is Mentor, bottom one is an universal Angie reshelled by UM. Bass setting was on minimum.

 


Edited by Xymordos - 7/1/15 at 8:45am
post #3854 of 3855
post #3855 of 3855
Hi! I'm having trouble with uploading photos, anyone care to tech me how frown.gif

Can you also help me determine the pin outs sonion 2023? Am I right, from the view of the solder pads, negative, center tap, positive? Actually, it's from a UE sf.5 pro. I am rewiring it and making a universal shell but got lost with the terminals even with the tweeter terminals frown.gif
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