6. A band-pass filter circuit for passing frequencies within a predetermined band pass comprising, input circuit means for receiving signals including signals which fall within the band-pass of the filter circuit, first monolithic crystal-selecting means including a single crystal element having first and second pairs of electrodes thereon forming first and second coupled resonators, second monolithic crystal-selecting means including a single crystal element having third and fourth pairs of electrodes thereon forming third and fourth coupled resonators, each resonator of said first and second monolithic crystal-selecting means having the same resonant frequency, saiD input circuit means being coupled to said first pair of electrodes to apply signals to said first resonator, amplifying circuit means having an input coupled to said fourth pair of electrodes to receive from said fourth resonator signals of frequencies within the band pass of the filter circuit, first de-Qing circuit means coupled to said second and third pairs of electrodes for applying signals from said second resonator to said third resonator and including a first resistor connected between electrodes of said second and third pairs, a second resistor connected across said electrodes of said second pair, a third resistor connected across said electrodes of said third pair, a first capacitor bridging said second resistor, and a second capacitor bridging said third resistor, said de-Qing circuit means reducing ringing effects through said first, second, third and fourth resonators, third monolithic crystal-selecting means including a single crystal element having fifth and sixth pairs of electrodes thereon forming fifth and sixth coupled resonators, fourth monolithic crystal-selecting means including a single crystal element having seventh and eighth pairs of electrodes thereon forming seventh and eighth coupled resonators, each resonator of said third and fourth monolithic crystal-selecting means having the same resonant frequency, said amplifying circuit means having an output coupled to said fifth pair of electrodes to apply signals to said third resonator, output circuit means coupled to said eighth pair of electrodes to receive from said eighth resonator signals of frequencies within the band pass of the filter circuit, and second de-Qing circuit means coupled to said sixth and seventh pairs of electrodes for applying signals from said sixth resonator to said seventh resonator and including a fourth resistor connected between electrodes of said sixth and seventh pairs, a fifth resistor connected across said electrodes of said sixth pair, a sixth resistor connected across said electrodes of said seventh pair, a third capacitor bridging said fifth resistor, and a fourth capacitor bridging said sixth resistor, said second de-Qing circuit means reducing ringing effects through said fifth, sixth, seventh and eighth resonators.