Quote:
Originally Posted by merlinmaxwell
They are rated at a maximum (current, minimum load resistance) and don't care in the slightest if they are not loaded at all, a few k ohms might (very very very much might if the following bit of kit is DC coupled to the input and has a huge input resistance) be useful. And do you use 30 (or is that 33) ohm cable?
Some may have noticed I have not included the output impedance of the unit which, in most cases, is near zero not matching any cable.
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Using the lower value is done to load out mobile phone noise.
The amplifiers have heavy metal cases and are out of reach of mobile phone noise.
There is a short stub of two core from the jack plug and then two bits of 50 ohm.
The total length is about 3 to 4 feet.
The source is designed to take 30 ohm headphones so loading it to the designed resistance is the correct thing to do surely.