Difference between the following NAD amps

I have my nad 2600 today some 24 years later. Now powers dynaudio contour 1.4's with ease.

I have both amps. I use them as seperates in a HT setup. The 2700 is upgraded version from the 2600A. They look identical cosmetically, size & weight and by connections etc. I think the difference is that the 2700 is has the thx specs whereas the 2600a does not. So from a Spec standpoint the 2700 maybe be better however I don't notice an audible difference between the two infact they are basically the same as far as power output vs ohms etc. I purchased them both about the same time. They are older NAD poweramp models. I purchased mine from an audio store in the late 80s (1989 most likely). They will each power loads down to 1 ohm according to NAD. They have been excellent over the years, i've never had to send with one in, they have been used alot and moved a lot over the years and I still use them as my mains so that tells you that they have been made/built well. At the time they were part of the NAD reference lineup. hope that helped.

I have both amps. I use them as seperates in a HT setup. The 2700 is upgraded version from the 2600A. The 2700 has the thx specs whereas the 2600a does not. So from a Spec standpoint the 2700 maybe be better however I don't notice an audible difference between the two infact they are basically the same as far as power output vs ohms etc. I purchased them both about the same time. They are older NAD poweramp models. I purchased mine from an audio store in the late 80s (1989 most likely). They will each power loads down to 1 ohm according to NAD. They have been excellent over the years and I still use them as my mains so that tells you that they have been made/built well. At the time they were part of the NAD reference lineup. hope that helped.

give nad a call. the number is on their website. they have knowledgable people in customer service and are easy to deal with.