| A summer is a special place. It requires very good performance from an opamp. Especially if it's from a large number of inputs. Remember that the amp is basically running at mic pre type gains for every signal that goes thru it, so it has to be wide bandwidth, low noise, and needs to be able to drive a fairly low impedance feedback network, plus its load.
I like the 990, or similar types, or the AD-797. LT-1468's aren't bad.
In a 4 to 8 sort of box, I'd look seriously at the 1468. |