as mentioned in the list I could use for example JL Audio for sure to accept the balanced input from the BMW HU. The sensitivity of the JL Audio amps ranges switchable from 0.2v-2v and 0.8v-8v. Do you know the lineout from BMW HU (Readio Professional) does fall into the range covered by JL Audio?
Because I am going to order an amp with balanced inut. There are lot of amps accept the speaker level input, I don't like that way because the signal would probably be bad preproccessed.