# Why does cable length matter so much when source is high impedance?

My beginner’s electronics book has now started to teach me about microphones, specifically Electret microphones.

While searching the web for more info, I stumbled upon an article where the author mentioned that when a microphone has high impedance it is critical to keep the cables connected to the microphone as short as possible or else the signal would degrade significantly.

I have been trying to make sense of such statement but so far I have failed miserably. No matter how I think about this I can’t imagine why a cable with such small impedance compared to a microphone’s huge impedance would matter at all.

In case it helps, here is a link to the YouTube video where this is mentioned.

Thanks.

• @K.Rmth $$Z_0=\sqrt\frac{L}{C}$$ This is ofcoruce for losless line where L and C are both expressed as F/m and H/m - distributed capacitance/inductance. – Golaž Aug 7 '15 at 11:53