Originally Posted by -=Germania=-
Hey All FreqShow owners.
Please let me know a few things if you can. I am trying to see if the FreqShow that I got is in fact much different from the rest of yours.
My impedance: 9.6 ohms per channel (checked with an HP E2377A DMM with cable on - for simplicity just do the same)
My Tweeter/Mids: Knowles TWFK Series
My Woofer: Knowles CI series 22955
These seem to be the same Drivers in the Westone ES3X.
This would explain the major difference I have heard from what other people have posted.
If someone can confirm the parts numbers of the drivers as well as their impedance, I would appreciate it.
Good analysis. I was checking these myself and found both drivers available from Mouser for a little more than $150/pair. The TWFK is the more expensive driver ($51.44/driver) compared to the CI22955 ($26.19/driver). Both drivers have roughly similar performance specs, with the CI22955 outputting higher at the bass end but leveling off pretty quickly in the high end while the new TWTK has a flatter response continually but extending better in the high end. Both drivers get erratic near the top but the TWTK holds it together better and longer in the HF. I was a little surprised by the specs. I was under the false impression that a three-way driver would have either a dedicated woofer and a dual midrange and tweeter or a dual woofer and midrange with a dedicated tweeter. Instead, it looks like this pairing is a single wide-range driver (CI22955) and a dual woofer-tweeter (TWFK).
It looks like they're being run together to allow each to offset the other's blindspots. If so, there's a potential issue with spikes in frequency response where the two drivers are covering the same frequencies well. But the specs are for undamped drivers. Filtered or crossed over, these two drivers could complement each other well. Despite its wide range, the less-expensive CI22955 has massive bass response compared to that of the TWFK.
Does anybody have a clue as to how to build a crossover that small? I could just use resistors as miniature line filters (L-Pads for ants) but I trust the smart money is on more sophisticated methods of frequency control.