Line-level inputs will be in excess of 1 KOhm (10KOhm if properly designed) Headphones will be up to 600 Ohm (I guess some boutique brands could have examples h

Line-level inputs will be in excess of 1 KOhm (10KOhm if properly designed) Headphones will be up to 600 Ohm (I guess some boutique brands could have examples higher but I digress, the grand majority is between 16 and 250 Ohm).