Having installed my old Kenwood "underseat" subwoofer in the boot I have 2 issues to discuss: 1. It's about 2X35 and 2X70 peak watts, so it demands max 8A from the 12V battery. Is it ok? 2. Size 28X20X7cm, small enough. Can this position cause problems with the HV battery underneath? I mean interference problems, I do not think so but I'm just asking. Also, I can turn it vertically, at the back of the seat. Any suggestions? (Install it under the seats was impossible, as I have Navigation drive at the left and parking computer at the right).