Cuboid 8, 10, 12 and 15 are fitted with two standard NL4 type connectors. These have two pairs of terminals. Cuboid uses only pins 1+ and 1-. These are linked across the two connectors, providing a useful link to a second loudspeaker of the same model. No more than two Cuboids should be connected to a single amplifier channel. 2+ and 2- are not connected and are not linked through. For connection, we recommend using a flexible cable with a minimum cross-sectional are of 1.5mm².