Geoff,
Pick up any of hundreds of books on audio amplifier or speaker design. You will find ample proof that equipment is designed to minimize extraneous noise from the power supply (that is where you will find the fuse). You will find a low output impedance and a high input impedance is recommended in order to minimize interconnection effects.
I dont know know why any of you would think well designed audio equipment should magnify things that we definitely do not want to hear. If this is not self apparent then you are in the wrong hobby because listening to music means a focus on the music (source signal) and not the fuse in the power supply.
Pick up any of hundreds of books on audio amplifier or speaker design. You will find ample proof that equipment is designed to minimize extraneous noise from the power supply (that is where you will find the fuse). You will find a low output impedance and a high input impedance is recommended in order to minimize interconnection effects.
I dont know know why any of you would think well designed audio equipment should magnify things that we definitely do not want to hear. If this is not self apparent then you are in the wrong hobby because listening to music means a focus on the music (source signal) and not the fuse in the power supply.