I own the BMC M1 amps, DAC1 PRE, and MCCI phono. I have used the amps with other preamps, run the system with single ended cables, and used the BMC gear without the Current Injection, which allows the amp to vary in output with what is required.
I will confirm that all of these contribute to the quality of what you hear.
I have not heard the Devialet and only saw one at CES. I thought the Hegel in the Weiss suite sounded great but have not compared it with the BMC. A friend, however, tells me that the BMC is better. The BMC MCCI phono stage does require a balance input and is far and away the best phono stage I have ever heard! It and the rest of the BMC gear are inexpensive for the quality they provide.
I will confirm that all of these contribute to the quality of what you hear.
I have not heard the Devialet and only saw one at CES. I thought the Hegel in the Weiss suite sounded great but have not compared it with the BMC. A friend, however, tells me that the BMC is better. The BMC MCCI phono stage does require a balance input and is far and away the best phono stage I have ever heard! It and the rest of the BMC gear are inexpensive for the quality they provide.