The attenuation curve ranges from 20 Hz to about 300 Hz. If you set the crossover point near 80 Hz, you lose a lot of bass frequencies. If you set it closer to 300 Hz, the sub does too much (esp. if you have tower speakers with nice mid-bass). Aiyima A20 mono's HPF is a joke. Suppose their stereo version isn't better.Hi, Stefan.
Why do you say the HPF implementation is poor? Do you find the attenuation curve too gradual?