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Old 16th Oct 2017, 9:34 am   #200
kalee20
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Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
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Default Re: Audiophoolery. 'Cable Break In' - I never knew that!

Quote:
Originally Posted by Refugee View Post
Quote:
Originally Posted by merlinmaxwell View Post
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.
The source is designed to take 30 ohm headphones so loading it to the designed resistance is the correct thing to do surely.
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?
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