Hello. I am a newbie and this is my first post. I just ordered a PD and I am pretty excited since this is my first real investment on good sound. I am currently using iPhone 7+ and a Bose QC15 headphones. sound level is not so high since i'm not using an amp. I think I need an amp to fully benefit from the headphones. What I'd like to ask is if QC15 and PD is a good match? Should I buy an amp? If so, which one would you guys prefer? And if QC15 is not a good match, what would be your recommendation for a 100 USD budget? Thanks.