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Silverprout · Mar 19, 2015 at 12:25 PM

furco said:
Are you suggesting there shouldn't be much of anything below 100Hz for the 30095? If so, I would agree with you and chalk it up to the lack of sensitivity of my entire setup (coupler + audio interface + computer + sound card + etc...).

computer + sound card is the problem IMHO.

30095 20 to 5K with my setup (1/24 smooting)

piotrus-g · Mar 19, 2015 at 12:44 PM

silverprout said:
computer + sound card is the problem IMHO.

30095 20 to 5K with my setup (1/24 smooting)

The problem is in using noise instead of sine. Trust me on that. @Furco's coupler seem pretty accurate.

Furco · Mar 19, 2015 at 12:58 PM

I'll give it a go with trying to graph it via a sine sweep. I'm resigned to the fact that if my coupler is accurate between 100Hz - 8kHz, that's really all I could possible ask for in a DIY prototype. But @Silverprout the fact that your setup shows that ~20db spike at 4.5Khz makes me smile because that what I see as well. Also, no "hump" between 1 - 2kHz either. Granted. it's only around a 3db increase based on the Knowles graph so the fact that it's either been smoothed out or is actually absent is probably inconsequential.

Thanks for the feedback. I greatly appreciate it.

Silverprout · Mar 19, 2015 at 1:09 PM

furco said:
I'll give it a go with trying to graph it via a sine sweep. I'm resigned to the fact that if my coupler is accurate between 100Hz - 8kHz, that's really all I could possible ask for in a DIY prototype. But @Silverprout the fact that your setup shows that ~20db spike at 4.5Khz makes me smile because that what I see as well. Also, no "hump" between 1 - 2kHz either. Granted. it's only around a 3db increase based on the Knowles graph so the fact that it's either been smoothed out or is actually absent is probably inconsequential.

Thanks for the feedback. I greatly appreciate it.

i want you to succeed !

ARTA can't smooth less than 1/24... and the spike is at 4.8K an 5K on your Knolwes Graph

oupssss... for the IEC711 accuracy !

Here is my knolwes the catalog graph :

Xymordos · Mar 19, 2015 at 1:14 PM

You really can't compare to that graph though, the peak shifts with different tubes length, material, and diameter.

Silverprout · Mar 19, 2015 at 1:21 PM

xymordos said:
You really can't compare to that graph though, the peak shifts with different tubes length, material, and diameter.

They have differents measurements protocols... depending on the weather

i'm joking...

Now we need two couplers to measure our CIEMS... The 711 is dead... new kid in town.

http://www.gras.dk/43ba-1.html

http://www.gras.dk/ra0045.html

Silverprout · Mar 19, 2015 at 2:20 PM

Now we can immagine that all CIEMs measurements are inacurate.

And try to re-measure all of them ?

And re-think about all comments about the treble quantity ?

LOL

Silverprout · Mar 19, 2015 at 2:35 PM

The 30095 has only one big spike around 5K... and now you know why i use RLC snubbers to kill spikes, instead of inefficient crossovers.

Mython · Mar 19, 2015 at 2:38 PM

silverprout said:
The 30095 has only one big spike around 5K... and now you know why i use RLC snubbers to kill spikes, instead of inefficient crossovers.

Can you spare a minute to educate me, please?

What is an RLC snubber (in the context of the CIEM world)?

Thanks

Silverprout · Mar 19, 2015 at 2:49 PM

mython said:
Can you spare a minute to educate me, please?

What is an RLC snubber (in the context of the CIEM world)?

Thanks

It is my "personal word" for the RLC circuit dampers.

I like the word... good sound

http://www.nxp.com/documents/application_note/AN11160.pdf

Furco · Mar 19, 2015 at 6:43 PM

silverprout said:
i want you to succeed !

ARTA can't smooth less than 1/24... and the spike is at 4.8K an 5K on your Knolwes Graph

oupssss... for the IEC711 accuracy !

Here is my knolwes the catalog graph :

Okay, now you're just showing off...

Mython · Mar 19, 2015 at 10:41 PM

From the EarWerkz Penta thread:

http://www.head-fi.org/t/751424/the-earwerkz-penta-ep-5-discussion-thread/75#post_11426388

shotgunshane said:
And it has a blurb about the Penta's bass secret sauce:

"...the Penta features 5 acoustic bores in the ear canal with dual resonance chambers (patent pending) to deliver bass unlike ever heard before in a CIEM."

(emphasis added by me)

Any thoughts?

Xymordos · Mar 19, 2015 at 10:50 PM

I remember a low pass acoustic filter is a narrow tube with larger chambers along the way, so the Penta probably has acoustic low pass for its bass drivers.

Silverprout · Mar 20, 2015 at 1:50 AM

If you add a resonator after the transducer and the transducer is making a boom, the resonator add a boom.

Instead of hearing only one boom, you ear boom boom...

:L3000:

Silverprout · Mar 20, 2015 at 3:56 AM

This is exactly that i try to avoid with my designs (uncontrolled and artificial resonances).

I’ve worked really hard on the damping of the dynamic driver, the rear chamber is closed and the acoustic filters (it is simplified a lot) only act on the decay.

You can modify the bass quantity by adjusting the bass decay time without modify the sound signature… the frequency response stay absolutely the same with all filter adjustments.

Power is nothing at all without control.

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