Audio Connectors - DB25 25-pin Connectors - Cable End - DB25 Connectors are used for a variety of audio and data purposes. DB25 Connectors can be commonly used for connecting 8 channel audio between stagebox and front of house equipment, for cables connecting audio patchbays and patching applications, and for Tascam and Fostex DA-88 I/O applications. DB25 connectors are also used for RS232 serial and SCSI connections between computer and printers.