I used this amp for 4 years without any trouble. Robust product because it still has not gone wrong in 4 years. I bought this amp for the price as my medium and my knowledge has the time were more limited. For the price it was ok but it was not worth more. it is sorely lacking in dynamics. No need to expect a supply box with this amp is a waste. With experience I will not redeem such a product, because today the market leader in this brand offers more efficient products with the qualities of the brand at very competitive prices.