The Quad Universal LNB can accommodate four separate receivers, as each receiver has independent control of band and polarization via 13v. and 17v. and 22kHz on/off switching respectively.

This LNB is primarily deployed in the Sky Digiboxes (with 2 LNB inputs and internal hard disks for recording one program while you’re watching another).

Two LNB outputs would go to one "Sky Plus" Digibox, leaving the other 2 LNB outputs for either 2 standard Digiboxes or to one additional Sky Plus Digibox.

The same prinicple is applied for any other satellite receiver with single or twin inputs.