Version 0.93 improves component value estimation for inductors and capacitors. Versions prior to 0.93 were good but 0.93 is getting near the limits of a standard sound card (for components within its rather limited range). 

In preparation for the release, I tested two 1.5mH inductors. One of them, clearly taped up and labeled 1.5 was measuring as 1.5mH. The other, fresh from the factory and labeled 1.50, was measuring 1.77mH. I don't have a good impedance meter so after scratching my head about this I did something smarter. I built a parallel circuit using each inductor in turn with a known 30uF capacitor. It was labeled 30uF and measured exactly that (so there is some error possible). 

I then created a signal and did two Measure / Impedance tests. Here's a view of the two. The red curve shows the resonance peak for the 1.5 factory inductor.

The red curve has its peak at 697 Hz and the tuned calculator looks like this:

Just FYI the measurement for the factory (Sidewinder) labeled 1.5mH was

So Speaker Workshop comes in handy.

Speaker Workshop is currently