AP SPK OUT 4.9 - 4CH OUTS CIRC. TERMINALS FEMALE AP SPK OUT 4.9 cable is dedicated to the connection of the AP4.9 bit amplifier with the input/output Extension cable. The Plug&Play connectors with circle terminals are numbered (“CH1 +”, CH1 -“, etc…) for a foolproof connection. There is no need to solder any cable. Features - Built with twisted cables For effective elimination of disturbances. No soldering required Round terminals For maximum ease of connection. Multi-amplification possible With all configurations. Cables are numbered For foolproof connection to the Extension cable. Specific model Dedicated to AP4.9 bit amplifier.