I am honestly not sure what the difference between the Mayflower Objective 2 AMP is compared to the Objective 2 ODAC. If I am getting the Beyerdynamic 880 250 ohm would the ODAC be useful at all? I am in college so moneys tight as of now.Thanks in advance!

DAC stands for digital to analog converter, the ODAC is designed to take the digital audio signals from your computer and turn them into analog sound signals which you listen to.

An amp is designed to take an audio signal and increase the amplitude of a sound wave. That allows headphones to be turned up louder but it also allows you to drive higher impedance headphones as well.

I hope this cleared things up for you.