While watching youtube on installation of these, why cant the 3 original wires be left on the controller and the new ones from the extender be spliced, or is that not good, seems the original connectors would be better than scrapping off glue.
Actually, you can splice them. I used to splice coax all the time. But in this case you'll likely create an impedance mismatch and attenuate your signal.
Every location along a cable containing a coupling, splice, or connector will introduce losses.
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