PEQ or shelf filter to block frequencies under 40hz?

[sean80]

Is it possible to create a PEQ or shelf filter to block frequencies under 40hz?

 

[harkpabst]

Due to their working principle neither a PEQ nor a shelf filter can efficiently block all frequencies below 40 Hz. That would require a high-pass filter. You could lower the level of frequencies below 40 Hz with a shelf filter or reduce frequencies around 40 Hz with a standard PEQ.

Why do you ask? What's your use case?

 

[sean80]

small single driver speaker. good idea with the PEQ roll off...just want to take some load off the 4 inch driver

 

[harkpabst]

A relatively low Q, high negative gain PEQ around 30 Hz or so might be better than nothing, in this case.