At the time I thought two CAST's were too quiet. There was no doubt which cap was technically the best. Yet...
Years ago I thought two VSF although nice tone were dynamically flat in comparison to CAST.
Tests went best in series.
1. CAST followed by VSF
2. CAST followed by CAST
3. VSF followed by VSF
The test had no consideration for cost.
At the time I wondered if in time tastes would go more toward CAST strengths and re-rank. I know people then thought I might not even hear the difference but they sounded a LOT different.
Thoughts at the time were about resonance. Yes the VSF resonate more but this can add life at a cost.
Test material is The Last Waltz Bluray
i use the hair stand up on my arms test. Might not sound sophisticated but as a hobbyist I am in this for the thrills!
Separation of the band as back up singers is a big difference. Much better with CAST
Female voices better for sure with CAST, well all voices.
This test is as tough as it was 7 years ago?...
The resonance adds life in the VSF. Metallic instruments sound more metallic.
Still tough today, if two CAST's are better than CAST/VSF and in this case I don't think so. Maybe CAST followed by RS betters the VSF and the VSF goes to second system?
In series I find the two separate styles compliment each other.
I have run into a bit of a road block for improvement on main system. Grannyring has sent pics of maybe my last area of significant improvement my lousy connectors.
I have VSF midrange cap and VSF woofer inductor, both I am sure would be bettered by CAST but out of my budget and I do not have a second home for them to go to like the tweeter caps.
I wish I bought both in CAST, still.
Well holiday project is now second system internals to be wired with Duelund tinned covered copper 16ga (WE 16ga as speaker cables) plus a Duelund VSF or RS cap added. Plus elimination of crappy connectors.