As long as they are all line level not a problem. If you planned on running the turntable wires from cartridge 18 feet that is a bad idea.
If all your sources are from digital devices I do not think it will be any problem.
But avoid unshielded IC
Some members may warn about high frequency loss for long lengths of IC, but most reasonable/low cost IC will not have a problem at 18 feet.
If all your sources are from digital devices I do not think it will be any problem.
But avoid unshielded IC
Some members may warn about high frequency loss for long lengths of IC, but most reasonable/low cost IC will not have a problem at 18 feet.