Just how many outlets do you need for your stereo?

@vegasears  Thanks for that, I had to chuckle: yep, I hear you.   If your are going to do it, why not overkill it and never but never have to do it again!  Gotta love that philosophy!

@mitch2 The only reason for having separate digital and analog receptacles is whether or not the receptacles are independently filtered.   Analog gear doesn't usually pollute the lines with noise but is rather susceptible to it while digital gear usually pollutes it quite well.   If the receptacles are independently filtered, then noise from digital gear won't get into the analog stuff.   If you have no filters, then you are right, it doesn't much matter.   Note that some analog gear now uses switch mode power supplies, so they have their own pollution issues to deal with and from a noise standpoint, are not exactly pure analog.

Also, in researching this a bit further, I noticed that the Pangea Audio line of AC receptacles do not have isolated grounds while the PS Audio receptacle is an isolated grounded unit.   A point to consider when buying one of these upscale receptacles.

Good point @spatialking. I use three separate 20A circuits (one for each monoblock and one for front end gear) and do maintain some level of filtering on the digital side, using an Isoclean unit.  However, the quote below from the VH Audio site indicates the filtering protects the gear from grunge on the mains, although I suspect the filtering will also protect analog from digital as long as the analog gear is not plugged into the same side of the filter as the digital gear:

For the perfectionist, the IsoClean 60A3 II is fitted with two ultra low impedance Audio Grade 60+60 AMP RF noise filters to attenuate noise and RF associated with city mains. The dual filters of the 60A3 are separate and independent of each other, in order to reduce interactions between your system's components.

@mitch2 The filter should protect equally well in both directions if it was designed to be symmetrical.  But even if it was not, it should give you some filter action.    

ONLY ONE.

A 15 amp standard house outlet will supply about 1800 watts. To be conservative, say 1500 watts.

This will EASILY cover most amplifiers of up to about 300 watts rms/channel, as well as ALL the other paraphernalia like tt, preamp, dac, streamer, CD player, etc, etc.

It is actually best practice to connect ALL your equipment to the SAME outlet to avoid ground loops.

If you use more than one outlet and their grounds are not at EXACTLY at the same potential (even a tenth of a volt difference is enough), you will have a ground loop and you may not be able to get rid of the hum & buzz, unless you use a ground lifter, which may be illegal in your locale.

Stick to ONE outlet.

@cakyol Actually, all of the equipment is plugged into one outlet.   I agree, everything should run from one potential.   A while back I had one amp plugged into an outlet 6 feet away but it was wired to the opposite side of the distribution panel, so the second outlet was out of phase with the first outlet.   I always had a hum problem until I got a breakout panel of 16 outlets that plug into the first outlet.   The resulting annoyance is what started this thread.   I am going to upgrade and I am trying to decide how many outlets my power conditioner should have for future proofing.   It appears that 20 is plenty based on what everyone has posted, assuming wall warts and fat plugs don't cover up adjacent outlets.