Product received with a defective HP (off-axis voice coil), causing unpleasant vibrations. Too bad because the product was promising, apart from an automatic sleep a bit confusing, do not be afraid to push the output level of the PC and reduce the overall volume, otherwise the amp off automatically after 5 minutes. So I returned the equipment, bravo AMAZON ensures that as usual, my card was credited a few days after the dismissal without costs. So I bought a competing product.