Filter Name Description Poles (#) Zeros (#)
LP4F PFI's Maximally Flat Low-Pass Filter ("Flat")* 4 4
LP4P PFI's Constant Time Delay Low-Pass Filter ("Pulse")* 4 4
BU4 Conventional Low-Pass Butterworth 4 0
BE4 Conventional Low-Pass Bessel 4 0
LP6F PFI's Maximally Flat Low-Pass Filter ("Flat")* 6 6
LP6P PFI's Constant Time Delay Low-Pass Filter ("Pulse")* 6 6
BU6 Conventional Low-Pass Butterworth 6 0
BE6 Conventional Low-Pass Bessel 6 0
LP8F PFI's Maximally Flat Low-Pass Filter ("Flat")* 8 8
LP8P PFI's Constant Time Delay Low-Pass Filter ("Pulse")* 8 8
BU8 Conventional Low-Pass Butterworth 8 0
BE8 Conventional Low-Pass Bessel 8 0
*Proprietary design by Precision Filters, Inc.