What are the basics of headphone amps?


I have a Krell KSL preamp and KSA-150 that have given much pleasure over the years. I now am at the point where my listening needs to be more private; I need headphones.

A number of emails to Krell have resulted in the advice, "get a headphone amp". I have pressed for more details but silence has been returned (sometimes we like silence but not in this case!).

It seems from my Google searches that there are many headphone amps for doing mixing and for supporting a computer or a travel CD. I can not find a single headphone amp that seems to function as an interface with a high-end preamp.

What am I missing? Can someone fill in the blanks that Krell has so poorly left?

Why can I not just get two RCA to phone adaptors and plug headphones (yet to be acquired) into the KSL outputs? How about using the Tape-Out outputs? Does the KSL not put out enough power to run headphones?

Thanks for any help you can give, James
audiochinook

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