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I'll take a broad definition of a pre-amp here - to include integrated amps, receivers, or anything that is used to switch signal inputs, and modify that signal (including DSP boxes and DCs).
Switching - You want to be able to switch in various sources, both analog and digital. To me, the DAC should be built into the pre-amp, and maybe a WiFi link too.
Volume Control - seems obvious; and you want levels matched for all sources. You want a quick way to mute things too.
DSP & Tone Controls - should all be done in the pre-amp, maybe DSP need or parametric EQ needs a nearby TV screen for display. And a quick way to switch among different setups, including a defeat switch. I'd include various filters under this category as well.
As an exemplary example I offer this vintage unit:
Tomlinson Holman also provided 2 different switches for dubbing 'directions' and
the ability to pan all the way from stereo to mono, and
the ability to send either input channel to both output channels.
Add in the new-fangled digital stuff I mentioned above, and you'd have the ultimate box to control your music.
Switching - You want to be able to switch in various sources, both analog and digital. To me, the DAC should be built into the pre-amp, and maybe a WiFi link too.
Volume Control - seems obvious; and you want levels matched for all sources. You want a quick way to mute things too.
DSP & Tone Controls - should all be done in the pre-amp, maybe DSP need or parametric EQ needs a nearby TV screen for display. And a quick way to switch among different setups, including a defeat switch. I'd include various filters under this category as well.
As an exemplary example I offer this vintage unit:
Tomlinson Holman also provided 2 different switches for dubbing 'directions' and
the ability to pan all the way from stereo to mono, and
the ability to send either input channel to both output channels.
Add in the new-fangled digital stuff I mentioned above, and you'd have the ultimate box to control your music.