Quote:
Originally Posted by Refugee
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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The source is designed to take 30 ohm headphones so loading it to the designed resistance is the correct thing to do surely.
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Why?
The output stage will almost certainly use complementary NPN/PNP emitter followers. So loading with less than 30ohms would overly stress them. But loading with HIGHER will give them an easier life - less heating; less thermally-induced distortion, everything happier!
A DC path might be necessary, but probably isn't.
Have you tried switching out your 33ohm loads and compared results?