Can anyone advise if connecting a new subwoofer, with only a line level input, to a old Technics receiver via the phono audio outputs do any harm to the subwoofer or cause any problems.
Any advise would be most appreciated.
Is the sub a powerd sub or does it require an external amp.
Most subs have a Line level in and one out as well. If this is the case and you have a powered sub you will simply need to connect one of your speaker connections from the Technics to the line level in and then connect the line level out from the sub to the the speaker. The sub will cross over the frequency's needed and then pass the full range back out. This is commonly known as a pass through
It would be very helpful if you could include Manufacturer and model numbers of the components in question.