Yamaha Soavo-1 Towers

[mardelgo]

"Uses electrolytic caps in series with tweeter"

I Think this is wrong. What you show in the picture is the crossover for the bass drivers and not for the tweeter. (In many speakers that are bi-ampable they put the crossover for the bass drivers in front of the crossover for the mid and tweeter) I think they (Yamaha) use a high quality Solen capacitors for the mid and Tweeter. Here is a picture of the crossover components:

 

[Audioholics]

That is certainly possible. We couldn't really take apart the speakers further. What's odd is that Yamaha peer reviewed the article for technical accuracy and said nothing...

 

[Seemoss]

Yes, according to Yamaha's Soavo-1 brochure (PDF) Solen metalized polypropylene capsitors are used. But your pictures shows the tweeter net-work, I think, as Yamaha's photo of the Woofer crossover features several capacitors and resistors, not just two.
Could the subdued mid-range be due to the loss of the "Wave-Guide-Horn" in the Soavo-1, rather than the driver design? But why has Yamaha stopped using its White Spruce (WSD) cones. It was claimed, at the time, to the "world's lightest cone material."