NAD（亲得）是家在美国注册的品牌，但是据说其设计和试验室却并没在美国而是设在英国，因而其产品基本上没有了美国器材的火爆，而是多了几分温文尔雅。17年前，NAD公司推出了一款3020合并式放大器，备受专家好评，因为其前级部分涌出的音色足以击败价格超过其数倍的前级放大 NAD is a family-owned brand in the United States, but its design and labs are said to have been located in the United Kingdom, but not in the United States, so their products are largely unpopular with American equipment, but a bit more subdued . 17 years ago, NAD introduced a 3020 combined amplifier, highly praised by experts, because of the sound part of the previous part of the sound enough to beat the price of more than its pre-amp amplification