Hi!
It's not absolutely necessary, but without it your man speakers and amps will still have to reproduce the bass, where most of the energy is. This will limit their dynamic range in terms of both excursion and amplifier power.
Using a high pass filter the satellites get worked a lot less, their woofers stay in a linear operating area more often and you can turn them up louder without distortion.
Best,
Erik
It's not absolutely necessary, but without it your man speakers and amps will still have to reproduce the bass, where most of the energy is. This will limit their dynamic range in terms of both excursion and amplifier power.
Using a high pass filter the satellites get worked a lot less, their woofers stay in a linear operating area more often and you can turn them up louder without distortion.
Best,
Erik