Re: virgin cable with sky box
If it's using a quad, then that should be enough to feed 4 tuners - 4 single, two twin tuner, or a twin and a couple of single tuners. If there are 4 feeds, where do the other two end up?
If there are 4 feeds and you need more, then either the LNB needs to be changed to an octo (and additional cables run) or you run the quad into a multiswitch - the multiswitch has to be QUAD compatible... a "Quattro" multiswitch expects 4 separate inputs of V high, V low, H high and H low, while a QUAD multiswitch handles the signalling required to set the QUAD LNB
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