For what it's worth, $7000 is a lot of money and you have no recourse if something goes wrong. Even if the equipment gets to you safely, you have no warranty and can't be certain if the components are gray market or clones. If so, the manufacturer would likely refuse to service them. IMHO, I would not purchase them.
What to expect if I import an amp and preamp from a Japan seller via US eBay
I can’t afford the cost of the amp and preamp I’d like to buy. I’ve discovered I can pay just less than half what I’d pay at a dealer in the US. But I haven’ t done this before. I’m aware that I won’t have a guarantee and that I’ll need a step down transformer. I willing to take the risk of no guarantee. But I don’t know what to expect when my box hits CUSTOMS. What can I expect? What are my responsibilities? How much is it likely to cost me?, I’ll be paying $7000 for the amp and the preamp..