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I went through the same dilemma back in 2002. McIntosh makes specific models in bunches, then moves onto another model. When I was ready to purchase, the MA6900s were temporarily unavailable.

I then had long conversations with a McIntosh engineer and a customer-service specialist. Both told me to make a choice based on my preferred features. They assured me that sonically the MA6500 and MA6900 would be impossible to tell apart. When I asked about the debates on the internet about Autoformers, both gentlemen said they are designed to be sonically invisible. Again, I was told to focus on the differences in features.

So instead of waiting for an MA6900, I purchased the MA6500. I am glad I did so. There are two advantages in selecting an MA6500: it is much easier to lift and costs far less to ship if it ever needs repairing. Another key difference between the two units is that the MA6500 has bass and treble controls, whereas the MA6900 has a five-band graphic equalizer.

I have not visited McIntosh's website for a long time, but they have always had info available that explained the purpose of the Autoformer. Sometimes the info is at the back of a downloadable (integrated amp or power amp) user manual.




Edits: 10/03/15

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