bunnypangsai
New Head-Fier
- Joined
- Jun 10, 2015
- Posts
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Planning to do a hybrid, with dd being the bass + 29689 being mid-high. Do I put a cap on the dd? How do you guys measure without using the acoustics instrument?
A view of my latest projects.....
The smoky iem's are a Westone 3 re-shell with an added Knowles CI-22955 with a 50ohn resistor. Green dampers on the tweeter and red on the CI driver. Sounds great with a more equal mid-tone roar.
The blue shells are going to house a 6 driver configuration with CI x 2 a HODVETEC and a TWFK with a 3 way crossover. I haven't tested this setup yet but have drivers coming in this week.
Just noticed that 1964 are achieving a very substantial large-bore=>small-bore ratio with the tubing on their ADEL module:
Or perhaps they are using a moulded plastic manifold, but I can't quite see a definite junction between the two, if that is the case.
Or maybe the ADEL module sits in an unusually deep solid acrylic portion of the shell, with that void (at the junction of ADEL module and it's dedicated soundtube) being moulded or drilled-out of the solid acrylic.
I recall Starkey (now M-Fidelity) using what appear to be custom-moulded sound tubes, on the SA-43, which is a nice way of maintaining consistency across numerous customers' pairs of CIEMs. It's always struck me as strange that more CIEM vendors don't use this approach, unless BAs have a less consistent batch frequency response than one would hope. Perhaps we will see more of this approach, with the increasing momentum of 3D printing technology (in which case, it might be done as an integral feature of the printed CIEM shell itself)
...whilst I'm on the topic of peculiarities in CIEM construction, I've never noticed any CIEM maker (professional or DIY) doing what Sony did with their soundtubes, here:
http://www.head-fi.org/t/739725/sony-announces-the-just-ear-brand-of-custom-iems/60#post_10993232
Anyone else have examples of such peculiarities not frequently seen in mainstream CIEMs?
I do appreciate that this is a DIY CIEM thread, but some cross-germination of ideas can be a positive thing, and I don't see why commercial makers should have all the fun.
In that spirit, here's some more food-for-thought, to get the old grey cells whirring:
http://www.head-fi.org/t/753632/introducing-the-worlds-first-lear-patented-nss-natural-stereo-sound-earphone-technology
Shotgunshane drew my attention to UE's updated UERM ('UE Pro Reference Remastered') this evening, and I noticed something similar to the earlier discussion, above, albeit presumably tuned in a different manner:
It continues to surprise me how few commercial CIEM-makers employ a consistent pre-configured moulded tubing assembly, like those used by Starkey/M-Fidelity, and now, UE; especially considering that 3D-printing can so easily prototype and produce such items.
As I see it, it could:
- save significant assembly time for each pair of CIEMs
- increase product consistency (& symmetry), in terms of internal appearance
- increase product consistency, potentially, in terms of frequency response
- potentially improve shock-resistance/robustness, because the BAs can be encapsulated within the tube-assembly, rather than the tubing being attached to the BAs only at the tiny nozzles (yes, I know acrylic or cyanoacrylate may be used to reinforce the joint, but still...)
And, as UE are (partly) demonstrating, there are tuning possibilities easily implementable in this kind of assembly which would be too much hassle if manually created on a per-CIEM basis, with conventional tubing. Examples include:
- deliberately convoluting the walls of the moulded tube
- extending the length of the moulded tube, back&forth, in a manner not viable to bend conventional tubing
- inclusion of a resonant cavity (e.g. Helmholtz) at some juncture along the length of the moulded tube
- tapering of the moulded tube (could be used for horn-loading or some other reason)
- more complex combinations of the sound tube outputs from each BA in the CIEM configuration, either all in parallel, or in partial Y-combinations, etc. etc.
The sky's the limit, acoustically-speaking.
So, in spite of how few commercial CIEM-makers are currently employing this approach, I nonetheless predict an increase in popularity, in the near future.
The Jupiter utilizes a unique approach to achieve its soaring high frequency response. An optimized resonator assembly replaces the traditional tube and dampener system of may earphones. This system’s high frequency extension is unattainable by with the more common conventional techniques.
Hi. Maybe someone know how i can get impendanse graph depending on the frequency. i use audiotester program and 10ohm resistor but its not work good
Those are looking great man!
Good Work
You can use ARTA, there is a software that comes with it called Limp made for measuring impedance. You will need to build something called a jig (which consist of a resistor of known value and some cables to connect to mic input and headphone input) to make measurements.
Here are some explantion http://soundhobby.com/measurementsystem.htm
Also you can search on google image for other example of the " limp jig" like this https://sites.google.com/site/amateuraudio/projects-1/arta-limp-and-or-room-eq-wizard-impedance-jig
This blog in Japanese have the easiest jig diagram if you just have a resistor and earphone cables http://fuchinove.ninja-mania.jp/artaimpedance.html
Dude, I know you kinda make your own "professional thing" with CIEMs but you are more than welcome to share with us thoughts, pics and stuff...
This is one of the latest for a Buddy, wood faceplates with amber shells... basic 3 driver CI+twfk
Sssexxy. You really mastered the process...how many have you done so far?