I have just installed a SPRO 2 module which sounds nice and powerful . But , once I connect it to my Sunfire subs via HL inputs , it muted . Even not power on the subs . Anybody have some idea on what may going wrong ? Thanks.
If the Pascal amp is BTL output (can't remember at the moment, but it probably is) they you probably can't use the HL inputs. These are often connected to GND on the sub which means you are shorting the output of the Pascal amp and it goes into protect mode. You need to use line-level inputs instead.