Nativ Wave - one channel is 6dB lower than the other channel

I have a problem with Nativ Wave and although I understand I am typically off-topic, I thought I would post it here, since this is probably the only forum where Nativ products are discussed.

The problem is that the output of one channel is lower than the output of the other channel by around 6dB.

The imbalance remains the same whether Wave is connected to Vita via S/PDIF or USB, whether low or high output is selected and whether single-ended or balanced output is used.

I have confirmed that the digital output from Vita has the correct channel balance, so most probably the problem lies in the analog output stages of Wave. Needless to say that I have performed a software recovery on Wave to no avail.

As far as I know there is not any balance control on Vita or Wave… A penny for ANY thought!