The 2318 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 3 to 10 kHz, Bandwidth 7 KHz, Center Frequency 6.5 kHz, Insertion Loss 1.5 dB, Rejection 32 dB. Tags: PCB Mount, Surface Mount, Lumped Component Filter. More details for 2318 can be seen below.