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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox’s S2 Survival Guide.
Post Subject: Plane wave tube comparison !Posted by martinshorn on: 8/20/2018
hi all. I’ve been collecting some information from a few curious people here in germany.  First of all: a plane wave tube measure of an maintained S2. Once with aluminum Diaphragma and once with the milky one.  

S2_Driver_DeaphragmsCharts.jpeg

  
Blue is the milky. As you can see - to my very surprise! - the aluminum (black) outperforms clearly.Seems like Romy is right. The aluminum is better and its a matter of adjustment to get it work right.   Unfortunately no transparent one here. The other very interesting thing another buddy noticed is regarding those transparent. They do have a different suspension profile. It’s not just the color that changes for entertaining purpose Smile  The S5/6 ones have a more shallow ripple or flater Profile that when using the same shimmer brings the Diaphragma closer to the Phaseplug and as such lowers the prechamber mass and reduces its lowpass effect. That likely boosts the high frequencies or reduces the >2k rolloff. But also dampens excursion and as such the low freq. levels.   
Cheers Josh 

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