Thanks , sub was intended as you said to sharpen up the SUB231-G.
The highest setting is 220 Hz on them, not 500, but they are
well integrated with the midrange driver
It's not about the available settings.
It's about the ability of the driver, if left to run full range, to do so linearily quite a bit higher than its intended crossover point.
Which is why I always disliked the "subwoofer" label on the SUB 225s, 231s, and even Basshorns.
All of them have to work quite a bit higher than a typical high quality subwoofer.
Best regards,
Jim Smith