I took a chance and sent my BM53 over to the UK from the USA. I had no right side speakers and narrowed it down to that. I dealt with Baris and he was great. The transaction was good and he was very prompt answering my emails and with my questions. I would recomend him if your looking to fix or update firmware (BM54 only). The address is [email protected]. I now have all 12 speakers working with the DSP. Look him up, he can help.