UserManeYou won't need a DAC/amp for B&o play's. The impedence is extremely low as they are made for use with smartphones. If you really think you need a DAC/amp, such as if you hear a lot of background "fuzz" from the static inside your device when you are listening with headphones then get an Objective 2 from mayflower electronics. Or alternatively whichever one is currently on deal here but turning the power up too high could most likely damage the headphones due to the low impedence/smartphone nature so I'd reccomend using them as is unless you really have an onboard sound problem on your device.