11 of 11 people found the following review helpful
4m sounds plenty but may not be enough,
This review is from: kenable COILED 3.5mm Stereo Jack to Socket Headphone Extension Cable Lead 4m (Electronics)
The extension lead is fine and delivery was prompt. Only thing to remember with coiled leads is that the quoted length is for when it's tightly stretched, ie uncoiled.
So ... allow for some slack, or your headphones will want to fly off towards the amp/TV :)