I just got my Sennheiser HD-280 Pro's yesterday for dorm and think it'll be best if I get a proper amp to drive them. Wondering if anyone has built a diy headphone amp before. They are 64 ohm headphones, so they don't need tons of power to get loud and I need an amp design that will be simple to make. Simplicity is key because many of the designs I've seen look awfully complex and I'll be a first time builder. Thanks in advance.