Model	Number of Channels	Low end frequency limit	High end frequency limit	Operation Modes	Attenuation Slope	Filter Type
3900	2	1000 mHz	99 kHz	LP, HP, BP, BR	115 dB/octave	Type: 7-Pole, 6-Zero Elliptical
3901	2	1000 mHz	99 kHz	LP, HP, BP, BR	115 dB/octave	7-Pole, 6-Zero Elliptical
3940	2	3 Hz	2 MHz	LP, HP, BP, BR	24 dB/Octave	Butterworth & Bessel
3944	4	3 Hz	2 MHz	LP, HP, BP, BR	24 dB/Octave	Butterworth or Bessel
3945	3	3 Hz	2 MHz	LP, HP, BP, BR	24 dB/Octave	Bessel/Butterworth
3955	2	170 Hz	26 MHz	LP	24 dB/Octave	Butterworth
3383	4	100 mHz	200 kHz	BP, BR, LP, HP	48 dB/Octave	Butterworth/Bessel
3988	2	30 mHz	1 MHz	LP, HP, BP, BR	48 dB/Octave	Butterworth and Bessel
3382	2	100 mHz	200 kHz	BP, BR, LP, HP	48 dB/Octave	Butterworth/Bessel
3361	1	100 mHz	200 kHz	BP, BR, LP, HP	24 dB/Octave	Butterworth/Bessel
3362	2	100 mHz	200 kHz	BP, BR, LP, HP	24 dB/Octave	Butterworth/Bessel
3363	4	100 mHz	200 kHz	BP, BR, LP, HP	24 dB/Octave	Butterworth/Bessel
3381	1	100 mHz	200 kHz	BP, BR, LP, HP	48 dB/Octave	Butterworth/Bessel