As usual with Amazon, the prices are a real lottery. I wanted to buy this amp there 15 days, on sale at 389 (memory) for some time and like magic, one month later, he returns to 520, or 130 more. No apparent reason. Conclusion, I will have done better to take it on. There is not even worth buying online as it is the same price (see cheaper) in specialty store. Whatever these shops "pro" will almost never make Yahama (of this type at least) because their products have become too "public", with a sound too "cold". Anyway, it was 389 for a case to 520. Or No.: /
