Putting a preamp on a integrated?

Do you mean physically on the unit or using only the amp section in the 6900? Physically on the unit is not a good idea because the preamp will impede convection cooling for the amp. Using only the amp section of the 6900 (which it indeed can do) is fine if the preamp you are adding is better than the built-in one - which would be surprising. I would advise against using a different preamp stage because IME, all my McIntoshes sound(ed) better with McIntosh preamps. Anyway, don't know if your question is answered but this is my attempt! take care -Arthur

Thanks Arthur. I didn't mean physically on the unit but adding a preamp to an integrated. Just wondering if you can do this. (I have no intention of doing this)Just wondering why people do this to integrated amps? Or what would be the advantage in doing this. Your answer was very helpful. Thanks!

You might do this if you have a superior preamp or are gradually upgrading from the integrated to separates. As long as you have access to the connections between the preamp and power amp portions of the integrated, you can add a preamp or add a power amp.