The short answer is that audio devices invariably use over-buffering, ie low output impedances (< 1000 Ohms) and high input impedances (> 10,000 Ohms). This works well because:
1. Audio electrical wavelengths are miles long so there are rarely any transmission line effects to deal with, in spite of the low transmission line impedance (~50 Ohms) of connecting cords.
2. Modern electronics rarely use transformers so there are no self resonance components that must be damped with deliberate loading.
3. At line levels (does not apply to microphones) there is no significant noise advantage to maximizing the "power transfer".
4. If you are a vinyl fan, you will have to be aware of the phono cart impedance (~47K)matching the phono pre-amp.
5. Your power amp output has current limits which means you can't parallel an unlimited number of speakers, ie the amp output has a minimum speaker impedance.
1. Audio electrical wavelengths are miles long so there are rarely any transmission line effects to deal with, in spite of the low transmission line impedance (~50 Ohms) of connecting cords.
2. Modern electronics rarely use transformers so there are no self resonance components that must be damped with deliberate loading.
3. At line levels (does not apply to microphones) there is no significant noise advantage to maximizing the "power transfer".
4. If you are a vinyl fan, you will have to be aware of the phono cart impedance (~47K)matching the phono pre-amp.
5. Your power amp output has current limits which means you can't parallel an unlimited number of speakers, ie the amp output has a minimum speaker impedance.
Depends but invariably a Sky Q box playing Spotify or YouTube so optical digital into thr Avr. I have also recently dug out my old Playstion1 to rekindle the old CD collection.
Thanks also @steveu for the above
This has been a very useful post. I'll soon be building an icepower 125asx2 based amp..and will be looking for an input buffer as I'd prefer to have a pot on the amp. Any suggestions which input buffer circuit is trialed and tested and sounds good..as well as would work for my purpose?
Thanks!
Thanks!