Separates have become the province of the purist who has no need for such things.
It used to be that functionalists bought these things and demanded convenience features.
My friend used to have a pre that did all that you mention. The L/R inversion switch was most useful for her because her livingroom speakers were on either side of two doorways. The other sides of these doorways lead to the bedroom. Open doors, turn speakers 180 degrees, flip switch, listen to music without yor head imploding.
Oh well.
It used to be that functionalists bought these things and demanded convenience features.
My friend used to have a pre that did all that you mention. The L/R inversion switch was most useful for her because her livingroom speakers were on either side of two doorways. The other sides of these doorways lead to the bedroom. Open doors, turn speakers 180 degrees, flip switch, listen to music without yor head imploding.
Oh well.