[piotrus-g]

  Is 3300 + 2 twfk possible ? That would be be 6 drivers with 3 way crossover.

don't see problem with that

 

[RealSpark]

  Is 3300 + 2 twfk possible ? That would be be 6 drivers with 3 way crossover.

Quite a few models are using this combination I think. 

 

[MuZo2]

Can you name few.

 

[Moz-Art]

Hey, does anybody know a good calculator or tool to calculate the crossover so you know what capacitor or resistor to use for the frequentie?

 

[Furco]

Hey, does anybody know a good calculator or tool to calculate the crossover so you know what capacitor or resistor to use for the frequentie?

This one seems easy enough to follow:
http://sim.okawa-denshi.jp/en/Fkeisan.htm

 

[Furco]

Is 3300 + 2 twfk possible ? That would be be 6 drivers with 3 way crossover.

John (aka The Wizard) over at Noble Audio built a 20 driver IEM. From what I can remember, it was partially a joke and partially a proof of concept to see if it could be done.

 

[MuZo2]

I didnt mean if its possible to put in shell, I was asking if they can be configured in 3way 2low/2mids/2highs

 

[acain]

You could but as many as the shells will allow, TWFK are hard enough to tune in just a 3 way. I couldn't imagine tuning a 5 driver.

 

[Silverprout]

  So what's the moral of this story?  
 
If anything, getting ANY kind of frequency response test rig will improve your configurations for all the reasons I listed earlier.  However, if you're craving accuracy, then getting something above and beyond the 2cc coupler is going to be on your short list.  The 2cc coupler is by far, the most useful coupler that you could employ because it's dirt cheap and semi-accurate.  Buying/Building a Zwislock coupler isn't for the faint of heart and then there's the elephant in the room:  How do you calibrate it?  The easiest method that I'd suggest it to compare the curves that your couple produce for a known frequency response.  It's flawed logic since in order for you to calibrate your coupler, you need a published frequency response for a set of headphones you own that was produced using a Zwislocki coupler!  Your chances of finding a FR graph that fits the bill are probably slim to none.  Nevertheless, you need to start somewhere.  But wait, all is not lost.  The Zwislock coupler is an analog for the real ear, just like the IEC-711 (60711) coupler.  So if you find an FR graph that was produced by an IEC711, you can use it as a basis for calibrating your coupler since they should, theoretically, behave the same.
 
Cheers!

Awesome,
You can also compare your couplers with the Knolwes IEC711 measurements
There are some zoomable precise graphs in that catalog : http://www.mouser.com/pdfdocs/Knowles-Acoustic-Interface-Design-Guide.pdf
 

 

[piotrus-g]

  Awesome,
You can also compare your couplers with the Knolwes IEC711 measurements
There are some zoomable precise graphs in that catalog : http://www.mouser.com/pdfdocs/Knowles-Acoustic-Interface-Design-Guide.pdf
 

you cannot really use those graphs as reference unless you have identical coupler, they use bare drivers to measure with very specific tubing attached to coupler (not drivers)

 

[Silverprout]

 
you cannot really use those graphs as reference unless you have identical coupler, they use bare drivers to measure with very specific tubing attached to coupler (not drivers)

It was my goal... to have the same coupler response as Knolwes.

 

[Music818]

  white noise would be better.
If you use soundcard for measurements then it's only a matter of software to produce sine sweep, find a new soft that can do it an you're ready to go

 
May try the "ARTA", a low cost but good software for headphone measurement.

 

[piotrus-g]

 
It was my goal... to have the same coupler response as Knolwes.

But that requires attachment to coupler that costs hundreds if not thousands of dollars, and this measurement cannot be easily copied to IEMs, so for DIYer there's no point in doing this

 

[Silverprout]

  But that requires attachment to coupler that costs hundreds if not thousands of dollars, and this measurement cannot be easily copied to IEMs, so for DIYer there's no point in doing this

DIY coupler reference tuning... if your coupler has the same FR of Knolwes with many armatures, you can't go wrong.

 

[tranhieu]

 
DIY coupler reference tuning... if your coupler has the same FR of Knolwes with many armatures, you can't go wrong.

It doesn't mean much. FYI UM doesn't use standard equipments either.