When to have 416 re-charged?

[les winter]

How can you tell that a lf driver needs a recharge. Mine sound fine to me. But perhaps, with a recharge, they would be better?

[GM]

Odds are that if it decays over time you won't notice it, so normally the driver's specs need to be [re]measured to find out if its Qes, Qts has risen appreciably. Obviously though, if you didn't measure them originally, then due to how much it rose by design over time [or was re-coned by GPA or worse, by others] you may still not know.

GM

[les winter]

Thanks GM.